Inter-Tel Imx/Gmx 416/832 Installation Manual

							INTER-TELPRACTICES 
IMX/GMX 416/832 INSlXLLATION & MAINTENANCE SPECIFICATIONS 
Issue 1, November 1994 
3.55 
The ProWPro68E Card also has a 60-pin ribbon 
cable connector so that it can be connected to the HDLC 
Card. These cards are connected to permit control of the 
HDLC serial link to the telecommunication cards. 
NOTE: The ribbon cable for the new Pro68E Card is 
much shorter than the ribbon cable that is used with the 
older Pro68 Card. If an existing Pro68 Card is replaced 
with a new Pro68E Card, the shorter cable may be used 
instead. (Refer to REPLACEMENT PARIS for the part 
numbers.) 
Disk Controller Card 
3.56 The Disk Controller Card is the interface be- 
tween the PC Motherboard and the hard and floppy disk 
drives. The card is connected to the disk drives through 
ribbon cables. In addition to controlling hard and floppy 
disk drive operation, the card monitors disk drive per- 
formance and provides error-checking capability. 
3.57 Currently, there are two types of Disk Controller 
Cards used on the 4161832 System: MFM-type, and the 
new IDE-type. These two card types, along with their 
associated hard disk drives and hard disk-to-controller 
interface cables, are not compatible. Either use all IDE- 
type equipment, or use all MFM-type equipment. Do 
not mix the two types. 
358 The IDE-type Disk Controller Card is shorter and 
narrower than the MFM-type Disk Controller Card. The 
single IDE-type hard disk-to-controller interface cable 
is a 4O-conductor ribbon cable, while the two MFM- 
type hard disk-to-controller cables are 34-conductor and 
2O-conductor ribbon cables. 
NOTE: The IDE-type Disk Controller Card cannot be 
used with the SUNTAC PC Motherboard. Instead, use 
the PCC,VLSI, MXIC, or M396F PC Motherboards. 
High-Level Data Link Control (HDLC) Card 
3.59 The HDLC Card is used to transfer data between 
the computer complex and the telecommunications 
complex via an HDLC-compatible communications 
link. In addition, it provides certain computer systemre- 
sources that enhance the reliability of the dual-proces- 
sor computer complex. 
NOTE: Only HDLC Cards that have been modified and 
labeled with ECN-2279 or stamped with artwork num- 
ber 826.3806-1, -2, or higher can be used with the 
VLSI, MXIC, and M396F PC Motherboards. 
3.60 The HJXC Card has a 60-pin ribbon cable con- 
nector so that it can be connected to the pro681 Ro68E 
Card. It also has a DB15 connector (15pin subminiature 
“D” female connector) to link it to the Matrix Card in the 
telecommunications complex. 
3.61 A reset switch on the front edge of the HDLC 
Card is used to manually reset the system during trou- 
bleshooting. This is a hardware reset (major reset), not a 
software reset (minor reset). Pushing this switch drops 
all calls in process and erases the SMDR buffer (up to 
427 records). 
NOTE: All Tl spans should be “busied out” and discon- 
nected from their cards before pressing the reset switch 
on the HDLC Card. 
Monitor Card 
3.62 The Monitor Card is used to connect a mono- 
chrome progr amming monitor to the system. There is a 
DB9 connector (g-pin subminiature “D” female comrec- 
tor) on the bottom edge of the Monitor Card for connect- 
ing a cable to the internal side of the peripheral 
connector panel on the back of the equipment cabinet, 
which in turn is connected to a programming monitor. 
Modem Card 
3.63 The Modem Card contains an auto-answer, soft- 
ware auto-baud modem for remote system access (300-, 
1200-, or 2400-baud, depending on the specific model 
installed). There is an RI11 modular jack on the bottom 
edge of the card (labeled LINE or WALL) for connect- 
ing a line cord to the modular jack (single-line port) on 
the Matrix Card. 
3.64 The device used for stand-alone/remote pro- 
gramming must be an IBM AI-compatible personal 
computer with a minimum: 6MB available memory on 
the hard disk drive, SJ&inch double sided/high density 
(1.2MB) floppy disk drive, 640k RAM (with minimum 
512k available), MS-DOS 3.3 (or 5.0,6.0, or 6.2), 300 
(or 1200 or 2400) baud modem, and monochrome or 
color monitor (CGA is not recommended). 
A program- 
ming mouse is optional. Refer to PRGGRAMMING, 
page 5-3, for information on remote system mainte- 
nance and programming. 
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							SPECIF’lCATlONS 
Issue 1, November 1994 INTER-TELPRACTICES 
IMX/GMX 416/832 INS’WLLATION & MAINTENANCE 
G. TELECOMMUNI CATIONS COMPLEX 
3.65 The bottom half of the main equipment cabinet 
contains the main Telecom Motherboard and telecom- 
munication circuit cards that control and coordinate the 
functions of the main system. Up to 27 cards may be 
connected to the main Telecom Motherboard, includ- 
ing: 
1 
m l-268 
l-2.P 
l-25. 
l-25 
l-25 
l-25 
l-9 Matrix Card (MXC) -required 
Keyset Card (DKSC, KSC, or KSGD) - at least one is 
rquired 
Single-Line Card (XC) 
Inward Dialing Card (IDC) 
hop/Ground Start Card (LX) 
hop Start Card (IX) 
m-d(EMc) 
Tl Card (TIC) 
l Refer to page 2-26 for station capacities 
3.66 The expansion cabinet, if installed, contains the 
expansion Telecom Motherboard and telecommunica- 
tion circuit cards that control and coordinate the func- 
tions of the expanded system. Up to 27 cards may be 
connected to the expansion Telecom Motherboard, in- 
cluding: 
1 
1 l-26. 
l-260 
l-2@ 
l-26 
l-26 
l-26 
l-9 Expansion (EXP) Card -required 
Keyset Card (DKSC, KSC, or KSC-D) 
SingleLine Card (SLC) 
Inward Dialing Card (IDC) 
Loop/Ground Start Card (LGC) 
Loop Start Card (UC) 
E-f~dPfO 
Tl Card (IX) 
l Refer to page 2-26 for station capacities. 
3.67 Descriptions of the cards are given in the follow- 
ing paragraphs. Drawings of the cards are located iu the 
lNSWLLAIION section. 
Matrix Card (MXC) 
3.68 The MXC provides the central digital switching 
element for the system. It contains the following system 
resources: 
0 Voltage test points for checking the system +WDC, 
-wDc, +12vDC, -12vDC, +3ovDC, -48vDC, 
and AC ring voltage levels. To measure system volt- 
age levels, voltmeter probes are inserted into the 
ground test point and the desired voltage test point. 
Refer to INS’IXLLATION, page 3-85, for details. 
l LED indicators show functional readiness, board- 
level error occurrences, and external clock activity. 
Refer to TROUBLESHOOTING for detailed LED 
information. 
0 
Reset switch is used to manually reset the system 
during troubleshooting. This is a software reset (mi- nor reset), not a hardware reset (major reset). Push- 
ing this switch does the following: 
- 
Preserves the battery-backed database informa- 
tion, non-conference calls in progress, outside 
calls being dialed from keyset stations, inter-sta- 
tion messages, calls on individual hold, do-not- 
disturb messages, and reminder messages. A call 
on system hold is changed to individual hold at 
the station that placed it on hold. 
- 
Restores M’MF decoders and speech channels, 
and resets the station clocks to match the system 
clock. Updates trunk key, DSWELF key, speed- 
dial key, and feature key lamp status. 
- 
Interrupts system operation, which disconnects 
pages in progress, calls ringing in, calls using the 
conference resources (as described on the next 
page), and calls using IYIMF decoders. Camped- 
on calls are discomtected and queue requests are 
canceled. 
- Terminates system and user programming. 
0 Male SO-pin amphenol-type connector for con- 
necting up to two music sources, a power failure 
transfer relay, and general purpose relays: 
- Up to two external music sources (such as radios, 
tape players, etc.) may be connected to the MXC. 
AGC circuits on the MXC automatically hold the 
volume of each music source to a predetermined 
level that is slightly lower than the normal voice 
volume, as required by FCC regulations. Opti- 
mal input level is 0.77!WRMS (OdB). For instal- 
lation instructions, see page 3-142. 
Relay 1, which is the power failure transfer relay 
-( d  an 
cannot be changed), can be used to connect 
one or more single-line sets to predetermined CO 
trunks in the event of processor card failure or a 
power failure. (If ground start trunks are used, 
the single-line set must be equipped with a 
ground start button.) The output is a normally 
open DPDT relay that is held closed during sys- 
tem operation. Additional equipment needed in- 
cludes a customer-provided PIT relay card and 
card mounting case. The MXC relay contact rat- 
ings are listed below. (See also page 2-38). 
0.6A at 12SYAC 
0.6Aat 1lOVDC 
2.OA at 30VDC 
- Any of the relays 2-4 can be used to activate an 
external signaling device when a call rings in on 
assigned CO trunks. The dry contacts follow the 
normal keyset CO ringing cycle (two seconds 
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							INTEB-TEL PBACTICES 
IMX/GMX 416/832 INS’IXILATION % MAINTENANCE SPECIF’ICATIONS 
Issue 1, November 1994 
0 
on/four seconds off). Ring in for the relay can be 
programmed for day and/or night modes. 
- Any of the relays 2-4 can be used for night 
switch to turn on or off lights, an alarm system, or 
other devices. The relay, which is activated when 
an attendant in the designated tenant group 
places the system in night mode, causes the 
swing connection to move from the “break” to 
the “make” position. 
- Any of the relays 2-4 can be used for activating 
external paging. The relay, which is activated 
when the paging zone to which it 
is assigned is 
accessed by a station user, causes the swing con- 
nection to move from the “break” to the 
umaken 
position. This contact can be used to activate the 
microphone input of an externally mounted pag- 
ing amplifier. 
Music-On-Hold (MOH) jumper straps for enab- 
ling one or both of the external music sources that 
are heard by callers when they are placed on hold or 
camped on. If connecting an external music source, 
place the associated jumper strap in the ON position 
(over the top two pins). Then, in the database, each 
trunk group and each station can be assigned music 
port 1, music port 2, silence, or tick-tones. Refer to 
PROGRAMMING, page 5-103. 
Maintenance modem circuit @.I11 modular jack) 
for connection to the Modem Card in the computer 
complex. When the system is in the default conflgu- 
ration, the modem is assigned as circuit number 27.3 
and extension number 2600. 
Conferencing resources for connecting up to 32 
parties in multiple conferences. There can be up to 
10 simultaneous three-way conferences or four si- 
multaneous eight-party conferences. Except for the 
fact that there can be only eight parties involved in a 
single conference, any combination using the 32 
dedicated conference circuits is possible. The con- ferencing resources also support the call forward, 
call transfer, station call monitoring, and DISA fea- 
tures when two trunks are connected. Conferencing 
utilizes a zero dB loss function so that there is no 
substantial loss in 
voice volume no matter how many 
people are in the conference. 
DTMF decoding circuits (eight) are used when 
single-line sets are dialing and when features such as 
DISA and automated attendant are used. They are 
also used for the Unsupervised CO Call Continua- 
tion feature (as described in paragraph 4.87 on page 
4-37). These eight decoders convert DIMI? signals 
to the digital codes used by the system. They are in 
use only while the dialed number is being processed, 
not for the duration of the call. If all eight DTMP de- 
coders are busy, the user may camp on. 
NOTE: If necessary, up to eight additional DTMF 
decoding circuits can be added to the Matrix Card by 
installing M’MP Expansion Chips (two chips per 
circuit; four chips per kit). Refer to REPLACE- 
MBNT PARTS for the part number. 
Tone generating circuit generates DTMP tones 
whenever needed by the system (for example, when 
a station user uses one of the system auto-dial fea- 
tures, such as LCR, call forward to the public net- 
work, station or system speed dialing, etc.). The 
circuit is also used to produce all of the system tones 
(busy, reorder, do-not-disturb, etc.) heard by digital 
keyset, single-line set, DISA, and automated atten- 
I 
dant users. (Analog keysets generate their own sys- 
tem tones.) 
DBl5 connector (15pin subminiature “D” female 
connector) for connecting a cable between the Ma- 
trix Card and the HDLC Card. 
3.69 If an expansion cabinet is to be installed, five 
MXC Expansion Chips are provided to allow the Matrix 
Card to operate properly in the expanded configuration. 
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							SPECIFICATIONS 
Issue 1, November 1994 INTER-TELPRACTICES 
IMX/GMX 416/832 INSTALLATION & MAINTENANCE 
Expansion (EXP) Card 
3.70 The EXP Card, which works in conjunction with 
the Matrix Card, provides the central digital switching 
element for the expansion cabinet. It contains the fol- 
lowing system resources: 
Voltage test points for checking the expansionpow- 
er supply +5VDC, 
-mDc, +12vDC, -12vDC, 
+3OVDC, -48VJX, and AC-ring voltage levels. To 
measure system voltage levels, voltmeter probes are 
inserted into the ground test point and the desired 
voltage test point. Refer to INSTALLKlTON, page 
3-85, for details. 
LED indicator shows functional readiness and 
board-level error occurrences. Refer to the TROU- 
BLESHOOTING section of this manual for addi- 
tional LED information. 
Male SO-pin amphenol-type connector for con- 
necting general purpose relays: 
- The EXP Card relay contact ratings are: 
CONTACT RAT- 
0.6A at 125VAC 
0.6A at 1lOVDC 
2.OA at 30VDC 
- Any of the relays l-4 can be used to activate an 
external signaling device when a call rings in on 
assigned CO trunks. The dry contacts follow the 
normal keyset CO ringing cycle (two seconds 
on/four seconds oft). Ring in for the relay can be 
programmed for day and/or night modes. 
- Any of the relays l-4 can be used for night 
switch to turn on or off lights, an alarm system, or 
other devices. The relay, which is activated when 
an attendant in the designated tenant group places the system in night mode, causes the 
swing connection to move from the “break” to 
the “make” position. 
- Any of the relays l-4 can be used for activating 
external paging. The relay, which is activated 
when the paging zone to which it is assigned is 
accessed by a station user, causes the swing con- 
nection to move from the “break” to the “make” 
position. This contact can be used 
to a&ate the 
microphone input of an externally mounted pag- 
ing amplifier. 
0 
DTMF decoding circuits (eight) are used when 
single-line sets are dialing and when features such as 
DISA, DID, and automated attendant are used. They 
are also used for the Unsupervised CO Call Continu- 
ation feature (see paragraph 22.14 on page 4-83 in 
the manual). These eight decoders convert DTMF 
signals to the digital codes used by the system. They 
are in use only while the dialed number is being pro- 
cessed, not for the duration of the call. If all eight 
IYI’MF decoders are busy, the user may camp on. 
If all the IYI’MF decoding circuits on the EXP Card 
are busy, devices installed in the expansion cabinet 
can use the decoders on the Matrix Card, if avail- 
able. However, devices installed in the main equip 
merit cabinet cannot use the decoders on the EXP 
Card. For this reason, it is recommended that 
MMF-intensive features (such as DISA, DID, and 
automated attendant) be installed in the expansion 
cabinet, rather than in the main equipment cabinet. 
NOTE: If necessary, up to six additional IYIMF de- 
coding circuits can be added to the EXP Card by 
installing MMF Expansion Chips (two chips per 
circuit; four chips per kit). Refer to REPLACE- 
MENT PARTS for the part number. 
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							INTER-TELPRACTICES 
IMX/GMX 416/832 INS’J.XLLATION & MAINTENANCE SPECIFICATIONS 
Issue 1, November 1994 
1 Keyset Cards (DKSCs, KSCs, or KSC-Ds) and 
Single-Line Cards (SLCs) 
3.71 
Station instruments are connected to the station 
I cards in the equipment cabinet. Digital keysets are con- 
nected to Digital Keyset Cards. Analog keysets, analog 
DWBLF Units, and Attendant Computer Consoles are 
connected to Keyset Cards. Enhanced Single-Line Sets 
(ESLSs), Single-Line Instruments (SLIs), industry- 
standard single-line DTMF sets, and playback devices 
are connected to either Single-Line Cards (AC-ringing 
instruments only) or Inward Dialing Cards (AC or DC). 
For more information on Inward Dialing Cards, refer to 
page 2-20. 
3.72 Digital Keyset Card (DKSC): Each DKSC pro- 
vides up to 16 circuits for connecting digital keysets. 
Each circuit has a self-correcting thermistor to protect 
the system from damage due to a short circuit in the sta- 
tion cabling. If a short circuit causes a thermistor to 
open, it will automatically close when the short is re- 
moved. 
3.73 Up to 50 digital keysets may be equipped with up 
to four digital DSWBLF Units each. The units are con- 
nected in series to the PC Data Port Module (PCDPM) 
on the back of the corresponding keyset. Unlike analog 
units, digital DSS/BLF Units do nor require station cab- 
ling separate from the keyset’s cabling; instead, they are 
powered by their own AC transformer. 
3.74 Each DKSC has a green LED (CARD ON-LlNE) 
to indicate the card’s functional readiness and 16 green 
LEDs (CIRCUIT BUSY) to indicate whether any circuit 
on the card is busy (see Figure 3-53 on page 3-90). 
3.75 Each DKSC comes equipped with one Digital 
Signal Processor (DSP) that provides resources for up to 
12 shared speakerphones. If desired, a second DSP can 
be installed to provide an additional 12 shared speaker- 
phone resources. 
NOTE: For information on using shared speakerphones 
for digital keysets, see page 4-40 in FEAWRES. 
3.76 
Keyset Card (KSC or KSC-D): Each KSC (or 
KSC-D; see the following note) provides up to eight cir- 
cuits for connecting analog keysets, analog DSS/BLF 
Units, and Attendant Computer Consoles to the system. 
1 Up to 50 KSC circuits can be used for installing analog 
DSS/BLF Units. As many as four analog units can be 
connected to a single card. Some KSCs have a 2A, 
25OVAC, AGC 2 (fast-acting) fuse to protect the system 
from damage due to a short circuit in the station cabling. 
Newer version KSCs have eight self-correcting thermis- 
tors (one for each circuit) instead of the fuse. If a short circuit causes a thermistor to open, it will automatically 
close when the short is removed. 
NOTE: To install any 8-line IMX AIM keysets two to D 
circuit, the new “dual-circuit” version Keyset Card 
(KSC-D) must be used (see REPLACEMENT PARTS 
for the part number). To install 8-line AIM keysets one 
to LI circuit, either the KSC or the KSC-D can be used. 
3.77 Each KSC has an LED (CARD ACTIVE) to indi- 
cate the card’s functional readiness. In addition, each in- 
dividual circuit on each card has an LED to indicate the 
circuit’s activity (lit green) or failure (lit red). 
3.78 
Single-Line Card (SLC): SLCs are used for 
connecting AC-ringing ESLSs, SLIs, single-line DTMF 
sets, and playback devices. They can also be used for 
connecting external paging equipment. Off-premises 
stations cannot legally be connected to SLCs; instead, 
Inward Dialing Cards (IDCs) must be used (see page 
2-20). Some SLCa have a fuse to protect the -48V out- 
put. Thisjke cannot be replaced in the field If the fuse 
is defective, the entire card must be sent in for repair. 
Newer version SLCs have a self-correcting thermistor 
instead of the fuse. If a short circuit causes a thermistor 
to open, it will automatically close when the short is re- 
moved. 
NOTE: For optimal performance, it is recommended 
that voice mail units and automated attendant playback 
devices be installed on IDC circuits rather than SLC cir- 
cuits. Doing this mutes any M’MF digits automatically 
dialed by the system (e.g., those generated when trans- 
ferring or forwarding an outside caller to voice mail). 
3.79 Each SLC has an LED (CARD ACTIVE) to indi- 
cate the card’s functional readiness. In addition, each in- 
dividual circuit on each card has an LED to indicate the 
circuit’s activity (lit green) or failure (lit red). 
3.80 Station 
configuration: Station instrument con- 
figuration depends on the number and type of station 
cards installed in the equipment cabinet. There can be 
any combination of station cards allowing combinations 
of keysets in eight-station increments (or 16-station in- 
crements if using digital keysets or 8-line dual-circuit 1 
IMX AIM keysets) and single-line sets or playback 
devices in increments of 16 (using SLCs) or in incre- 
ments of eight (using IDCs). 
NOTE: At least one Keyset Card (DKSC, KSC, or 1 
KSC-D) must be installed to provide an attendant 
(equipped with a display keyset or an Attendant Com- 
puter Console) that can receive system alarm messages, 
program system data, act as the attendant for unsuper- 
vised CO recalls, etc. 
3.81 Each station card circuit is assigned a hardware 
address number according to the card’s slot in the equip 
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SPECIFICATIONS INTER-TELPRACTICES 
Issue 1. November 1994 IMX/GMX 416/832 DXMLLATION & MAINTENANCE 
ment cabinet and the location of the circuit on the card. 
For example, circuit 1.2 is the second circuit on the first 
card installed in the equipment cabinet. 
NOTE: In the default database configuration, there are 
no keyset circuits assigned for 8-line IMX AIM keysets 
installed two to a circuit (e.g., 1.2A and 1.2B). 
3.82 When the system is tirst powered up, one of three 
default configurations (A, B, or C) will be used to assign 
extension numbers to the station circuits. If configura- 
tion A is used, telecommunication card slots l-20 are 
considered KSCs and slots 21-26 are considered LGCs. 
If configuration B is used, slots l-10 are considered 
KSCs, slots 11-19 are SLCs, and slots 20-26 are LGCs. 
If configuration C is used (IMX systems only), slot 1 is a 
KSC, slots 2-10 are DKSCS, slots 11-19 are SLCs, and 
slots 20-26 are LGCs. Changes to any of the configura- 
tions can be made through database programming. Re- fer to PROGRAMMIN G, page 5-171, for more 
information. 
NOTE: ConfigurationC, which contains Digital Keyset 
Cards, is used only on IMX systems. 
I 
3.83 The system assigns extension number 1000 to 
station circuit 1.1, extension number 1001 to station cir- 
cuit 1.2, and so on to match the initial configuration. 
:Circuit l.l&equipped as the primary attendant’s keyset 
when the system is in the default configuration. If de- 
sired, the circuits can be assigned different extension 
numbers and/or three-digit extension numbers through 
database programming. Refer to PROGRAMMING, 
page 5-58, for more information. 
NOTE: When 8-line IMX AIM keysets are assigned to 
dual circuits, the “B” circuits do not have extension 
numbers until they are assigned in database program- 
ming. 
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							INTER-TELPRACTKES 
IMX/GMX 416/832 INS’IYALLATION & MAINTENANCE SPECIFICATIONS 
Issue 1, November 1994 
Loop/Ground Start Cards (LGCs) and Loop Start 
Q*(Lsw 
3.84 Each LGC and LX! has circuitry for up to eight 
trunks. LGC and LSC circuits may also be used for in- 
stalling external paging equipment. LSCs can have only 
loop start trunks connected to them. LGCs can have 
either loop start or ground start trunks. Each circuit on 
the LGC has two jumper straps for designating whether 
the circuit is loop start or ground start. Individual trunks 
may be designated as either loop start or ground start in 
database programming. 
NOTE: For each LGC circuit, both jumper straps must 
be in the proper (LS or GS) position. If the strap settings 
are mixed, or if one or both of the straps is missing, the 
circuit will not function properly. Also, when setting the 
straps, note the unique ordering of the LGC circuits as 
shown in Figure 3-57 on page 3-97. 
3.85 For optimal CO trunk transmission performance, 
each LGC and LX circuit should be “hybrid balanced” 
in database programming. Hybrid balancing refers to 
selecting the balance network - ideal, loaded, or un- 
loaded -that best matches the trunk’s impedance. Re- 
fer to PRGGRAMMIN 
G, page 5-148, for details. 
3.86 Should voice transmit or voice receive volume 
problems occur, the receive gain and/or the transmit 
gain for individual trunks can be adjusted in database 
programming. Refer to PROGRAMMIN 
G, page S-103, 
for additional information. 
3.87 Each LGC and LSC has 16 specially designed 
fuses soldered to the card to protect it from large voltage 
surges due to lightning. If a fuse is open (blown), it may 
mean that other parts of the card have also been dam- 
aged. For this reason, open fuses must not be replaced in 
the field. Instead, the entire card musk be returned for 
testing and possible repair. Failure to follow this policy 
will void the warranty on the card. 
3.88 When the system is in the default configuration, 
all trunks are configured for IYPMF signaling. Ifneces- 
sary, some or all of the trunks can be reprogrammed for 
dial-pulse signaling through database programming. 
Although both the LGC and the LSC can use dial-pulse 
trunks, the pulse circuitry on the LGC is more sophisti- cated and may provide better performance in certain sit- 
uations. 
NOTE: Single-line sets generate their own IYTMF tones 
when dialing. If used on dial-pulse trunks, both the 
IYI’MF tones generated by the phone and the dial-pulse 
signals generated by the system are sent to the central 
office, which may be a problem if the central office rec- 
ognizes both. To avoid this problem, single-line sets 
should be restricted to LCR only when using dial-pulse 
trunks. Then, only the LCR-generated dial-pulse signals 
will be sent to the central office. 
3.89 With loop start trunks, it is sometimes possible 
for the user to attempt to place an outgoing call and 
instead be comtected to an incoming call on the same 
trunk. This unintended connection, called glare, is due 
to the natural switching delay characteristics of the telco 
equipment and the system. Previously, if the user did not 
dial a valid outside number, the glare connection was 
dropped. The software now allows the incoming call to 
remain connected, while still protecting against pos- 
sible toll fraud. A new system-wide programmable op 
tion, called Drop Incomplete Outgoing Calls, has been 
added to the Miscellaneous System-Wide information 
screen, as shown on page 5-67 in PROGRAMMING. 
3.99 The CO circuits are assigned hardware address 
numbers according to the card’s slot in the equipment 
cabinet and the location of the circuit on the card. For 
example, when using initial configuration number one 
(see paragraph 3.82), CO circuit 21.4 is the fourth circuit 
on the 21st card (an LGC) installed. 
3.91 When the system is in the default configuration, 
the first four trunk keys on each keyset are assigned as 
call keys for incoming call indication/access. (The AN- 
SWER key may also be used to access incoming calls.) 
No individual trunk keys or trunk group keys are as- 
signed. Key assignments can be designated in database 
programming. Refer to PROGRAhJMlN 
G page S-44, 
for more information. 
3.92 CO trunk groups may be assigned on a tenant-by- 
tenant basis. Up to 102 CO trunk groups (142 on expan- 
ded systems) can be distributed among the tenant 
groups. Refer to lXAlWW3, page 4-15, for more in- 
formation. 
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							SPECIFICATIONS 
Issue 1, November 1994 INTER-TELPRACTXCES 
IMX/GMX 416/832 INSTALLATION & MAINTENANCE 
Inward Dialing Cards (IDCs) 
3.93 IDCs are used for connecting direct inward dial- 
ing (DlD) trunks and off-premises single-line stations. 
Like SLCs (described on page 2-17), IDCs may also be 
used for connecting on-premises single-line sets and 
playback devices. In fact, for optimal performance, it is 
recommended that voice mail units and automated at- 
tendant playback devices be installed on IDC circuits 
rather than SLC circuits. Doing this mutes any MMF 
digits automatically dialed by the system (e.g., those 
generated when transferring or forwarding an outside 
caller to voice mail). 
NOTEr IDCs do not support message waiting applica- 
tions. If single-line sets with message waiting lamps are 
installed on IDCs, the lamps will not function. 
3.94 On older-version ID& each IDC circuit has a 
2-pin AC ENABLE jumper strap that must be removed 
when installing a DID trunk or a DC-ringing station. If 
the AC ENABLE jumper strap is installed, an AC-ring- 
ing off-premises station can be connected directly to the 
IDC circuit (cxzem2 HVRAUnits, power supplies, and 
ring generators are not needed). 
3.95 On newer-version IDCs, each IDC circuit has a 
3-pin RING SELECT jumper strap that must be set in 
I either the AC/OPX position (over the bottom two pins) 
or the DC/DID position (over the top two pins). NOTE: When setting the jumper straps on either ver- 
sion card, note the unique ordering of the IDC circuits as 
shown in Figure 3-56 on page 3-95. 
3.96 Each IDC can have up to eight DID trunks or up 
to eight single-line sets, or any combination of the two. 
3.97 DIDtrunksmaybeprogrammedtoringintoin- 
dividual stations, multiple stations, or hunt groups. Or, 
theymaybeprogrammed toringinas DISACalls. Ifpro- 
grammed to ring in at a single station, the DID call will 
follow any programmed forward. 
3.98 DID trunk groups may be assigned on a tenant- 
by-tenant basis. Up to six DID trunk groups (11 on ex- 
panded systems) can be distributed among the tenant 
groups. Refer to lTHVRES, page 4-15, for more in- 
formation. Also, DID trunkgroups maybe designated as 
immediate start, wink start, or delay start in database 
prwamming. 
3.99 Each IDC has 16 specially designed fuses sol- 
dered to the card to protect it from large voltage surges 
due to lightning. If a fuse is open (blown), it may mean 
that other parts of the card have also been damaged. For 
this reason, open fuses must not be replaced in the field. 
Instead, the entire card urusr be returned for testing and 
possible repair. Failure to follow this policy will void the 
warranty on the card. 
Page 2-20  
						

							INTER-TELPRAcTIcEs 
IMX/GMX 416/832 INS’IXLLATION & MAINTENANCE SPECIFICATIONS Issue 1, November 1994 
E&M Cards (EMCs) 
3.100 
E&M trunks, also called “tie” lines, are special 
trunks that tie individual telephone systems together. 
They allow the users of either telephone system trans- 
parent access to the users and resources of the other tele- 
phone system, often for less than what it would cost to 
use normal long distance service. 
3.101 E&M (literally “ear” and “mouth”) refers to the 
pair of wires that carry the signals between the trunk 
equipment and a separate signaling unit. The M lead 
transmits a ground or battery condition to the signaling 
equipment, while the Elead receives open or ground sig- 
nals from the signaling equipment. 
3.102 If designated for “auto ring-in,” E&M trunks 
may be programmed to ring in to individual stations, 
multiple stations, or hunt groups on the other telephone 
system. (If programmed to ring in at a single station, the 
E&M call will follow any programmed forward.) 
3.103 If designated for “dial repeating,” E&M trunks 
may be programmed to ring in as DISA calls. 
3.104 Additionally, LCR may be used to turn what 
would normally be a long distance call into a local call. 
For example, when a call is made from one telephone 
system to a long distance number that is local to the oth- 
er telephone system, LCR could be programmed to 
route the call through the E&M network to make a local 
call from the other telephone system. 
3.105 Each EMC has circuitry for up to four E&M 
trunks. Each individual circuit on the EMC has two 
jumper straps, one for selecting the signaling type (1,2, 
4, or 5) and one for selecting the audio type (2-wire or 
4-wire). The signaling and audio type for each circuit 
must also be programmed in the database. 
3.106 Although not currently operational, the EMC is 
equipped with a “make-busy” switch for removing all 
circuits on the card from service and placing them back 
in again. The switch is reserved for possible future use. 
3.107 For optimal E&M trunk transmission perform- 
ance, each 2-wire EMC circuit should be “hybrid bal- 
anced” in database programming (4-wire circuits 
cannot be hybrid balanced). Hybrid balancing refers to selecting the balance network .- ideal, loaded, or un- 
loaded -that best matches the trunk’s impedance. Re- 
fer to PRGGRAMMIN G, page 5-148, for details. 
3.108 Should voice transmit or voice receive volume 
problems occur, the receive gain and/or the transmit 
gain for individual E&M trunka can be adjusted in data- 
base programming. Refer to PROGRAMMING, page 
5-103, for additional information. 
3.109 Each EMC has 24 specially designed fuses sol- 
dered to the card to protect it from large voltage surges 
due to lightning. If a fuse is open (blown), it may mean 
that other parts of the card have also been damaged. For 
this reason, open fuses must not be replaced in the field. 
Instead, the entire card rrmst be returned for testing and 
possible repair. Failure to follow this policy will void the 
warranty on the card. 
3.110 When the system is in the default configuration, 
all E&M trunks are configured for DfMF signaling and 
dial repeating. If necessary, some or all of the trunks can 
be reprogrammed for dial-pulse signaling and/or auto 
ring-in through database programming. 
3.111 The E&M circuits are assigned hardware 
address numbers according to the card’s slot in the 
equipment cabinet and the location of the circuit on the 
card. For example, E&M circuit 21.4 refers to the fourth 
circuit on the 21st card (an EMC) installed in the equip 
ment cabinet. 
3.112 When the system is in the default configuration, 
the first four trunk keys on each keyset are assigned as 
call keys for incoming call indication/access. (The AN- 
SWER key may also be used to access incoming calls.) 
No individual E&M trunk keys or trunk group keys are 
assigned. Key assignments can be designated in data- 
base programming. Refer to PROGRAMMING, page 
S-44, for more information. 
3.113 E&M trunk groups may be assigned on a tenant- 
by-tenant basis. Up to 102 E&M trunk groups (142 on 
expanded systems) can be distributed among the tenant 
groups. Refer to FEMURES, page 4-15, for more in- 
formation. Also, E&M trunk groups may be designated 
as immediate start, wink start, or delay start in database 
programming. 
Page 2-21  
						

							SPECIFICATIONS INTER-TELPRACTICES 
Issue 1, November 1994 
IMWGMX 416/832 INSIXLLA~ON 81 MAINTENANCE 
Page 2-22 
Tl carcIs (Tics) 
NOTE: The acronym for the Tl Card -TlC-should 
not be confused with the special TlC digital carrier sys- 
tem (which operates at twice the data rate of the standard 
Tl carrier system). The 416/832 Tl Card does not sup 
port TlC. 
3.114 The term “Tl” refers to a specific digital meth- 
od of transmitting voice and data; it is the basic 24-than- 
nel time-division multiplex (TDM), 1.544 Mb/s pulse 
code modulation (PCM) system as used in the United 
States. 
3.115 The Tl standard, which was developed as a 
method of reducing cabling and increasing transmission 
quality between distant central offices, is actually a sub- 
set of a multi-level Digital Signal (DS) scheme. In popu- 
lar usage, Tl refers to the DSl rate as transmitted via any 
type of media (e.g., copper wire, fiber optics, or micro- 
wave). 
3.116 Since each Tl span actually consists of 24 indi- 
vidual circuits (or channels) multiplexed together, it is 
often less expensive to purchase a single Tl span than it 
is to purchase multiple individual trunks. Each of the 24 
Tl circuits can be programmed as a loop start, ground 
start, DID, E&M, or OPXtrunk (or as unequipped). Any 
combination is possible. 
3.117 “Fractional” Tl, often called FIl, is a special 
Tl service where only a portion of the 24 channels are 
used and paid for. To implement fractional Tl (if avail- 
able), equip only those circuits that are provided. 
NOTE: Currently, the Tl Card is used to transmit voice 
signals only, not data. In the future, data transmissions 
over Tl circuits may also be supported. 
3.118 To interface with the public network, each Tl 
Card must be equipped with a customer-provided, on- 
board Channel Service Unit (CSU) or a customer-pro- 
vided, external CSU. If the optional on-board CSU is 
installed, the programmer must select the line build-out 
(LBO) attenuation, which is determined by the distance 
to the nearest public network Tl repeater. (This infor- 
mation is available from the Tl provider.) If an external 
CSU is installed instead, the programmer must select 
the DSX-1 line length, which is determined by the dis- 
tance from the Tl Card to the external CSU. (The card 
and the external CSU must be located in the same build- 
ing, and the cabling between them must be less than 655 
feet.) 
I NOTE: The on-board CSU can now be purchased 
directly from Inter-Tel using part number 440.3004. 
3.119 Although most Tl interfaces will be with the 
public network, it is possible to use Tl Cards to connect two telephone systems together (e.g., two 4W832 Sys- 
tems). To do this without CSUs, the two systems must be 
located in the same building and the cabling between 
them must be less than 655 feet. If each system is 
equipped with a CSU, they may be located in separate 
buildings and the cabling between them may be as long 
as 6OOO feet. (See page 3-38 for more information on 
comtecting two 416/832 Tl Cards together.) 
NOTE: For information on programming various types 
of Tl installations, refer to pages 5-122 to 5-130. 
3.120 In the future, a Tl span could possibly be used to 
connect the 416/832 System to a host computer via a 
Digital Multiplexed Interface @MI). Also, the Tl Card 
has been designed to interface with the coming Inte- 
grated Services Digital Network (ISDN) features, when 
available. 
3.121 When a Tl span is used to connect a 416/832 
System to the public network or to another telephone 
system, it is important that the two endpoints communi- 
cate at the same frequency. Since it is practically impos- 
sible for both endpoints to have clocks running at 
identical frequencies, one endpoint is given “master” 
clock status and the other endpoint is given “slave” 
clock status. The slave clock can then extract and lock 
onto the master clock frequency from the incoming Tl 
information. This master/slave synchronization is pro- 
grammed in the database. When connected to the public 
network, the 416/832 System is automatically desig- 
nated as the slave clock. 
3.122 When information (currently, voice only) is 
transmitted over a Tl span, a “framing” bit is added so 
that the receiving end can recognize where the informa- 
tion begins and ends (as long as the clock circuitry of the 
two endpoints is synchronized). Currently, the 416/832 
System supports the two major types of framing 
schemes in use today: D4 Superframe, which is the most 
common, and Extended Superframe @SF), which is re- 
quired to support future ISDN and DMI features. For 
voice transmissions, D4 Superframe is quite adequate. 
However, for data transmissions (not currently sup 
ported), ESF is much more reliable and efficient. 
3.123 Digital information is transmitted over the Tl 
span as a series of 1s and 0s (e.g., . ..lOOO 000 8000 
OOOl...). If there are too many consecutive zeroes, the 
Tl clock extraction circuitry will not operate correctly. 
To prevent this, Tl carrier equipment limits the number 
of consecutive zeroes. The 416/832 System supports the 
two major types of zero code suppression schemes inuse 
today: Alternate Mark Inversion (AMI), also called 
bit-7 stuffing, and Bipolar Eight Zero Substitution 
(BSZS). Again, for voice transmissions, AMI is quite 
adequate. However, for 64 kb/s clear channel data trans- 
missions (not currently supported), B8ZS is required. .’