Inter-Tel Imx/Gmx 256 Installation And Field Maintenance Manual

							~E&cncEsSTALLATON & MAINTENANCEIssue 1, No”%=430
lf the system is not programmed to recognize the
absorbed digits, two problems may arise. One problem
is that a telephone number of fewer than seven digits,
that is dialed at a toll-restricted station, is notrecoguixed
as a valid telephone number and the call is dropped. The
other problem is that toll restriction can be defeated by
dialing the absorbed digits before dialing a toll number.However, when programmed to 
recognixe a single
string of absorbed digits (with up to 12 digits in the
string), the system checks the remaining digits for toll
restriction and processesnumbers with fewer than seven
digits as local calls (except 411 calls, which are consid-ered seven-digit toll calls). If the first non-absorbed
digit is “1” or “O”, SCOS 1,2, and/or 8 are enforced im-mediately (see SCOS, beginning in paragraph 4.34).
Absorbed digits appear in the SMDR record when
dialed if they are not repeatable or suppressed.4.31 The absorbed-digit designations are pro-
grammed on a trunk groupby-trunk group basis. No
trunk groups are designated for absorbed digits when the
system is in the default state. See page 5-113 in PRO-
GRAMMING for more information.Equal Access
4.32with equal access, the customer must choose a
primary long distance carrier. This is the carrier that will
automatically be accessed when the user dials a long
distance telephone number. Customers may also select asecondary carrier or use several secondary carriers.
These secondary carriers are accessed by dialing the
equal access prefix (10 or 101) and a three- or four digit
code assigned to the desired carrier (XXX or 
XXXX)
before dialing the telephone number. When using a sec-
ondary carrier, the telephone number is dialed as usual
after the equal access code-including the toll field (1,
0, or 01) and the area code, if needed.433
A restricted trunk group that does not have equal
access designation prevents the system from providing
accurate toll restriction and call cost information when
1 “10XxX” or “101xxxx” is dialed on a trunk in that
trunk group. When programmed for equal access, the
system ignores the equal access code and checks the re-
maining digits for toll restriction. Equal access designa-
tion is programmed on a trunk group-by-trunk group ba-sis. All trunk groups are designated for equal access
when the system is in the default state. To limit access to
specific secondary carriers, the stations can be restricted
to using LCR Only.Station Class of Service 
(SCOS)
4.34SCOS is programmed on a station-by-station ba-
sis and each station can have different restrictions for
day and night modes. A station can be completely unre-
stricted (SCOS 0) or can have any combination of the
following restrictions.CAUTION
REGARDlNGEMERGENCYNUMBERS
In areas where the emergency number is 1911, be
sure that toll-restricted stations have SCOS 8 (En-
able 
AL,D) and that 911 is in the allowed long dis-
tance number list. Otherwise, toll-restricted users
may not be able to find a station that is permitted to
dial 
“l+” numbers. Note that 911 is allowed at everystation regardless of toll restriction, but 1911 re-
quires this special programming.J435SCOS 1 -Operator restriction: Calls that be-
gin with a “0” are restricted. This also restricts intema-
tional calls.
NOTE: If this restriction is not set, and a user dials “0”as the first digit when placing a call, only SCOS 3 is
checked; no other toll restriction is checked.436
SCOS 2-Toll access restriction: Thisrestricts
calls that begin with “1” unless they are on the allowed
long distance number list and the station has SCOS 8.437SCOS 3 -International call 
Ipstriction: Calls
that begin with “01” are restricted.
NOTE: If international calls are allowed (SCOS 1 and
SCOS 3 are not set) and the user dials “01” as the firstdigits when placing a call, no other toll restriction is
checked.438 SCOS 4
- Eiitdigit call restriction: Cdls
are not permitted if they are over seven digits in length,
unless they are in the allowed long distance number list
and the station has SCOS 8. Users with this SCOS must
dial a valid telephone number before the appropriate 
In-
terdigit timer expires; otherwise the connection will be
dropped and the user will hear reorder tones.439 
scos 5- Area/office code restriction: This
restriction is divided into eight user groups to allow dif-
ferent area/office code restriction tables for each of the
user groups. This is useful for reducing restrictions for
some of the station users while increasing restrictions
for others. Each station is assigned to a user group in
database progr
amming. Within each user group, area
codes can be designated as restricted, allowed, or ex-tended. Restricting an area code prevents users 
from
placing calls to that area code. Allowing an area code
also allows all 
05ce codes within that area code. Allow-
ing an area code also allows all office codes within that
area code. Designating an area code as extended allows
the programmer to determine which office codes (up to
800) are allowed or restricted within that area code. For
each user group, 160 area codes can be marked as al-
lowed or restricted in the database list, and up to four
area codes may be marked as extended.Page 4-27 
						

							FEATmEsIssue 1, November 1994INTER-TELPRACTICESJMX/GMX 256 INSllALLATxON & MAINTENANCE
4.40SCOS 6 -LCR Only: Calls can only be placed
using the Least-Cost Routing 
(LCR) feature when this
restriction is assigned. The user will hear reorder tones
when attempting to place a call using any other method.
A restricted user can still access individual trunk groups
if the trunk groups are are designated as “exempt 
from
LCR Only” (as described on page 
4-26), or if the calls
weretransferred, were placed on hold, or are recalling orringing. 
LCR-Only stations access only the facility
groups assigned (see page 4-33 for more details). Trunk
restriction determines which trunk groups in the facility
group can be
accessedby the station. Because stations
with this SCOS can use only LCR, they 
cannot forwardcalls to outside telephone numbers (unless they are
using a trunk group designated as exempt from 
LCROnly). For more information on LCR, refer to page
4-32.
4.41SCOS 7 -Alternate carrier number restric-
tion: Calls can not be placed to any of the numbers onthe alternate carrier number list if the station is given
this restriction. (For example, to restrict 411 at certain
stations, enter the 
number in the alternate canier list and
give the stations SCOS 7.) There can be up to 20 alter-
nate carrier numbers with up to 10 digits each. The 
mnn-bers should not 
contsin the toll field, but can contain
equal access digits (e.g., do not enter 1+ or 0-1 numbers,
except 
10xXx and 101xXxX numbers). An “X” in a
number represents any digit O-9.
NOTE: Allowed long distance numbers override alter-
nate carrier number restrictions. Also, numbers are only
restricted if they exactly match the number on the alter-
nate carrier list. For this reason, alternate carrier num-
bers can have a plus (+) added to the end of the number
to restrict users from bypassing toll restriction by dial-
ing extra digits after dialing the alternate carrier num-
ber. For example, 
976+ restricts all calls that begin with
976.4.42 SCOS 8
- Allowed long distance number:
Stations with this SCOS are allowed access to numbers
in the allowed long distance number list. There can be
up to 20 numbers of up to 10 digits each. Calls placed to
these numbers are not subject to SCOS restrictions 2 and
4-7. Operator-assisted and international calls (SCOS 1
and 3) are not checked against this list. An “X” in thenumber represents any digit O-9, for example,
xXx-555-1212 allows users to dial directory informa-
tionusing any area code. 
Aplus (+) in the number allows
any number that begins with the designated sequence(for example, 
800+ allows any 800 number to be
dialed). The numbers should not include the toll field.Class-of-Service Account Codes
4.43SCOS can be programmed to be associated with
account codes. This permits 
a user to place a call from
any 
station using his class of service account code to en-
able his usual SCOS. When a class-of-service account
code is entered, the system checks the associated station
and applies its SCOS to the call being made (line access
permission and LCR advance class-of-service are not
applied). When the call is completed, the programmed
SCOS for the station being used goes back into effect.
The call appears in the SMDR report as being placed
from the station being used, and the 
account code will
appear unless an optional account code is entered later
(during the call).Speed-Dial Override of 
Toll Restriction
4.44System speed-dial numbers can be programmed
to bypass SCOS restrictions on a system-wide basis. If
the option is not enabled, all system speed-dial 
munbers
are subject to toll restriction.North American Numbering Plan 
(NANP)
4.45
The growth of telecommunications services has
created an increasing demand for more telephone 
num-
bers. To meet the demand, 
Bellcore has prepared a long-
range North American Numbering Plan 
(NANP) to pro-vide additional telephone numbers. The plan expands
the capacity of the current numbering system by making
area and office codes interchangeable. That is, number-
ing patterns formerly reserved for office codes can be
used as new area codes, and office codes within existing
area codes can have the same pattern as other area codes.
4.46
‘with interchangeable codes, switching systemslose the ability to distinguish between 
7- and lo-digit
numbers by examining the first three digits. To address
this, three methods have been proposed:l The Refix method requires a 1 before a lo-digit
number, and does not allow 1 before 7digit num-
bers.l The 
Tinning method requires the switch to wait
approximately four seconds after seven digits have
been dialed to see if additional digits are received.
0The Hybrid method requires timing only if a 0 or 1 is
dialed before a 7digit number that begins with three
digits that could be an area or office code (use the
NXX pattern described below).
4.47The former dialing pattern required an area code
to be in the 
“NZX” format, where N=2-9,ZzO or 1, and
X=0-9. The new numbering plan allows the area code
format 
“m” which is the current office code format.
Therefore, with the new numbering plan, more area and
office codes will overlap.
Page 4-28 
						

							INTER-TELPRACTICESIMXIGMX 256 INSTALLATION & MAINTENANCEF-EATURESIssue 1, November 1994
4.48
The following chart illustrates the difference be-tween the new 
Nun&zing Plan Analysis (NPA) and
each of the overlap flags. In the chart, N=2-9,Z=O or 1,
and 
X=0-9.
AREA CODESOFFICE CODES
CAN BE:
CAN BE:
FGEz-;\SB NZXor NXX NXX
MEA CODES AS NnOFFICE CODESNXXorNZX
4.49In order to properly process the new NPA, four
flags have been added to the system database. During
database programming, the programmer can specify the
following non-standard numbering plan information:
Offi~CodesUsedasAreaCodes:Anareacodein
another location uses an Nxx pattern that matches
an 
oflk code within the system site’s area code.
(This flag defaults to no.)
Area Codes Used as Office Codes: One or more of-
fice codes within the system site’s area code use anNZX pattern that is the same as an area code in
another area. (This flag defaults to no unless you are
converting a database that has the “Overlap 
Area/
Office Code flag enabled.)Toll Digit Allowed On 
Toll Local Calls: This op
tion applies only ifthe area and office codes overlap.
Callers 
in the site’s area code usually dial a 1 whenplacing a call within the local area code(s). (This
flag defaults to no.)
Toll Digit Required On Toll Long Distance Calls:
This option applies only if the area and office codes
overlap. Callers in the site’s area code must dial a 1
when placing a call outside of the local area code(s).
(This flag defaults to yes.)4.50 The programming prompts affected by the
NANP changes are shown on the next page.
4.51Area code lists in the database, for toll restriction
and LCR, include all 800 possible area codes. All areacodes are allowed in toll restriction and are included in
LCR Route Croup 1 when the software is in the default
state. 
(In upgrades, only the new area codes default to
allowed in toll restriction, and they are 
iucZr&donly inRoute Croup 1. All other area codes remain as pro-
grammed.)NOTE: Toll restriction SCOS 4 (Restrict Eight-Digit
Calls) is affected by the area/office code database flags
and toll digit flags. The area/office code flags must be
set properly on the system in order for toll restriction to
work correctly for the given site. The system must know
whether the area and office codes overlap and whether
toll digits will be dialed to properly detect end of dialing
and apply toll restriction. For example, if you have the
system set to look for a toll digit (1) on toll long distance
calls on a system where area and office codes overlap,and the station user placing a call does not dial the 1
(dials 213-555-1234 instead of l-213-555-1234), the
system will allow the call and will consider end-ofdial-
ing to be after the seventh digit, as if the user was dialing
a local non-toll call. However, if the station user dials
1-213-555-1234, the call will be restricted as usual af-
ter eight digits are dialed.Home And Local Area Codes
4.52 
In many areas, the telephone company has
created call-cost arrangements that refer to “home” and
“local” area codes. The home area code is the area code
within which the system resides. The local area codes
are additional area codes that, when called, use the local
or toll local call-cost rate instead of the long distance
rate. Up to three local area codes can be programmed
and then extended within toll restriction programming
to provide proper call costing.
4.53The local area codes can be programmed as “Ex-
tended” area codes to allow or restrict 
specific office
codes within them and to label the office codes’ call costas “local” or “seven-digit toll.” If the home or local
codes are extended in User Croup 1, the system will use
the call cost designations for that extended area code
whenever a station (in any user group) places a call us-
ing that area code.Page 4-29 
						

							FEATURESIssue 1, November 1994DITER-TELPRACTICE!s
IMX/GMX 256 INSTALLATION & MAINTENANCE
H.OPTIONAL WEEKLY TOLL JJMlT!SNOTE: This feature is available only 
iu the Extended
package and is enabled only by Inter-Tel Services per-
sonnel. The system must have a modem that allows re-
mote access.
4.54When enabled, the Weekly Toll Limit feature
keeps track of the accumulated call cost for specifiedtypes of toll calls. The feature can monitor 
7- and
lOdigit toll calls and/or operator-assisted~mtemational
calls that are 
placed by station and DISA users.4.55 The database is programmed with a weekly
dollar limit for each type of call being monitored. This
value can range 
from $0-$65,000. Each time a moni-
tored call is placed, the call cost is added to the total.
4.56
Ifthe total cost of monitored calls reaches 80% of
the weekly limit, the system sends an alarm message toalarm stations and the SMDR that states 
TOLL
SECURlTY LlMlT Al- 80%.457When the weekly limit is reached, the system
sends another alarm message that states 
‘I’LL SE
CURlTY LIMIT EXCEEDED. The monitored types ofcalls 
(7/lOdigit or operator/international) will not be
allowed until one of the following occurs:
0The weekly limit is set to a higher value through da-
tabase programming, as described on page S-97.l The weekly accumulated total is reset to zero
through programming, as described on page S-97.l
The weekly accumulated total automatically resets
to 
zero at the end of the week (1201 am Sunday).
4.58If a station is forwarded to a toll number that is
being disallowed due to the weekly limit being exceed-
ed, calls will be handled as follows:l
An intercom caller hears busy tones.
0A direct ring-in outside call rings at the station until
the Transfer Available or Transfer Busy timer ex-
pires before being sent to the primary attendant.
0Calls through DISA or an automated attendant riug
at the station until the Transfer Available timer ex-
pires before being sent to the appropriate recall des-
tination.
0Transferred calls remain at the transferring station.
0Calls from a voice computer are sent to the atten-
dant.459Weekly toll limit information can be changed
only after the Database Programming feature code (029)
has been entered at an attendant station. The program-
ming privilege will remain in effect until the end of the
programming session. When the data has been changed,a system alarm shows 
Tou SECURITY DATACHANGED at alarm stations and in SMDR. For
programming information, refer to page 5-97 in
PRGGRAMhfING.
NOTE: If the “Remaining Days” value is 0, weekly toll
limit database information cannot be updated.4.60 The Weekly Toll Limit feature is enabled by
Inter-Tel Services personnel. The database contains aprompt that indicates the remaining days that the
weekly toll limits will be in effect. This value automati-
cally decreases by one each day. When the “Remaining
Days” value reaches 0, the 
Weekly Toll Limit feature is
disabled and calls are no longer monitored. A systemalarm indicates 
TOLL SECURlTY FEATURE EX-
PIRED. Users trying to place monitored calls will see adisplay that says CALL 
FATLED - TOLL LIMlTEXCEEDED. To enable the feature again, Inter-Tel
Services Personnel must reset the “Remaining Days”
value. (See page 6-41.)
NOTE: If a system database restore is performed, the
Remaining Days value of the Toll Security 
Weekly Lim-
it feature is reset to 0. It is not restored to its previous val-
ue.
Page 4-30 
						

							INTER-TELPRACTICESIMX/GMX 256 INSTALLATION & MAINTENANCE
PEATuREsIssue 1, November 1994
I.TRUNK GROUP ASSIGNMENTS ANDAUTOMATIC ANSWER/SELECT
4.61Each trunk is assigned to one of 47 possible trunk
groups. Trunk groups are assigned to 
speciGc tenantgroups to determine which attendants will place the
trunk groups in night mode. A trunk group can also be
designated for auto trunk selection (using the ANSWER
key as described in paragraph 4.63) for a tenant group.l
Trunk group feature codes and trunk group keys are
usedtoselecta~inoneoftheprogrammedtrunk
Pups- up to 47 groups. Each trunk must be as-
signed to a trunk group. For example, all local trunks
could be in one group, while another group contains
WATS trunks that are used for long distance calling.
Unused trunks can be placed in a single trunk group
that is labeled “unused.” Trunk group feature codes
are necessary when forwarding calls to outside tele-
phone numbers.l
Auto trunks are incoming or outgoing trunks (any or
all trunks installed can be auto trunks) that are ac-
cessed by entering the Automatic Trunk Selection
feature code (89) or by pressing the ANSWER key.
4.62Automatic lhmk Answer: If a station is pro-
grammed with allowed-answer assignment only (no
ring-in) for a trunk group, direct ring-in calls on that
trunk group can be answered by entering the Automatic
Trunk 
Answer feature code (350) or pressing the flash-
ing individual trunk key.
4.63Automatic ‘Ikunk Select: For calls that are ring-
ingorholdingatthestation,theusermayentertheAuto-
matic Trunk Selection feature code (89) or press the
ANSWER key. When more than one call is ringing orholding, the following priority list determines which
call is answered tlrst:
Ringing outside calls (ring ins, recalls, callbacks, or
transfers) are answered in the order they were re-
ceived.
Then calls on individual hold are answered (not callson system hold, conference hold, or being trans-
ferred). Calls are picked up in the order they were
placed on hold.
If no calls are ringing or holding, an available outgo-
ing auto trunk is selected (unless the station is re-
stricted to using Least-Cost Routing Only or is re-
stricted 
from the trunk group).Page 4-31 
						

							INTEX-TELPRACTK!~IMXIGMX 256 INSTXLLATION & MAINTENANCE
J.LEAST-COST ROUTING (LCR)
4.64LCR is a money-saving feature that allows the
system to be programmed to select the least expensiveroute for placing outgoing calls. It can be used for
placing outgoing calls or transferring calls to outside
telephone numbers, but cannot be used for forwarding
calls to outside numbers. Stations 
canbe programmed to
use LCR only for placing outgoing calls.
NOTE: The Least-Cost Routing 
(LCR) feature cannot
be used in the RF-rated system. If a user attempts to en-
ter the LCR feature code or presses an LCR key, the sys-
tem sends reorder tones. Programmable feature keys on
keysets and single-lines are defaulted to LCR in a KF-
rated system and should be changed.
4.65When LCR is selected, the user dials the number
(including the area code, if needed), and the system does
the following:l
Checks the ana code and/or office code: The data-
base contains up to 19 lists of area and office codes
called route groups. The system checks the route
groups in numerical order (1-19) and selects the first
group that contains the area 
and/or ofice code that
was dialed. Special route groups are included in the
software for handling calls that begin with 0, 01, and
011.l
Check the time of day: Each route group has threetime blocks: day 
(8:oO AM - 459 PM), evening
(590 PM - 1059 PM), and night (11:oO PM - 759
AM and weekends).
0Selects a facility group: Each time block contains
up to 24 programmed groups of up to 47 trunk groups
each, called facility groups. The groups should beprogrammed so that the least-expensive group of
trunks is checked and, if available, is selected first. Ifthe least-expensive group is not available and the
station has LCR camp-on permission, the station
camps on until a trunk is available or the LCR Ad-vance timer expires. If the timer expires, the user
hears a progress tone and the system checks the next
facility group.
NOTE: The system advances only as far as each sta-
tion’s assigned LCR advance limit allows.l Adds or deletes digits according to the facility
group chosen: Each facility group has a pro-
grammed set of dial rules that tell the system what to
dial. (The system can have up to 32 dial 
rules - 28
of which are programmable. Each facility group can
use 1 to 32 dial 
rules.) For example, if the selected
facility group requires that the number contain “1,”
but no area code, the dial rules include the 
“1” anddrop the area code. The modified telephone number
can contain up to 
48 digits.
‘;‘\
.,Y
0Checks for toll restrictions: Once the number has
all of the necessary digits added or deleted, the sys-
tem checks the SCOS and trunk group restrictionsfor the station to 
determine whether the call is al-
lowed. If allowed, the system continues to the next
step. If not allowed, the system selects another facil-
ity group. If the station is restricted from all of the
facility groups in the route group, the system sends
reorder tones and the call is dropped without being
- dialed.
NOTE: If more than one trunk group is assigned to afacility group, only the highest numbered trunk
group is checked for toll restriction. That trunk
group’s toll restriction programming is applied to all
other trunk groups in the facility group. Therefore,
to restrict calls, ensure that the highest numbered
trunk group in the facility group has the desired toll
restrictioll programming.Toll restriction is checked
each time a new facility group is accessed, allowing
individual facility groups within each route group to
have different toll restrictions.
0Diils the modiied telephone number: If the num-
ber is allowed, the system seizes an idle trunk in the
selected trunk group, waits for the Dial Tone Wait
timer to expire (unless DT detect is enabled), and
then dials. The user hears a single progress tone and
outside dial tone. If the system 
DTME tones are not
muted and the station is not programmed for “trans-
parent LCR” the 
user also hears the dialing sequence
while the call is being placed.
4.66When LCR is used, the station user hears a singleconfirmation tone when a call key, the LCR key, the
OUT key, or the OUTGOING key is pressed or when the
feature code is entered. The user does not hear dial tone,
but will hear the digits being sent on the trunk. The user
is connected to the trunk once the system has completed
dialing the call and the call appears under an available
call key.
Operator-&siiedAnternational LCR
4.67The Least-Cost Routing feature has special route
groups to handle calls that begin with “0” (operator as-
sisted calls), “01” (operator assisted international calls),
and “011” (station-to-station international calls).
4.68Each of these special route groups contains three
time blocks (day, evening, and night/weekend) and each
time block contains an ordered list of facility groups.Country codes, area codes, and office codes are not
checked; all calls that begin with”0,” “01,” or “011” are
automatically sent to the 
appropriate route group.
,.I.I_ ’
Page 4-32 
						

							I
INTER-~PFLACTICESIMWGMX 256 INSTALLATION & MAINTENANCEIssue 1, No”%=
‘ItansparentLcR
4.69Transparent LCR mode is a station option that
changes what the user hears so that an LCR call soundslike an outside call placed using direct trunk group
access. With this mode, dial tone is heard when a call
key or the 
LCR, OUT, or OUTGOING key is pressed or
when the feature code is entered. Dial tone stops when
the user begius dialing. No tones are heard by the user
while the system is dialing the number out on the trunk.
When the system is in the default state, this feature is en-
abled.LCR-Only Forced Account Codes
4.70 Forced account codes for toll calls can be
programmed for stations with LCR-Only toll restriction
in day 
andnight modes. When this account code type is
enabled, the user only has to enter an account code if the
system detects that a toll call has been dialed when LCR
is used. See pages 4-63 and 
4-66 in FEKWRES, andpage 5-54 in 
PRGGRAhMING for more information.LCR Advance Liiit
4.71In addition, stations are assigned day and night
mode LCR advance limits that determine the number of
facility groups that the call may advance through when
LCR is used. (When facility groups are busy or unavail-
able, LCR is generally programmed to advance 
fromthe
least expensive facility group to the more expensive fa-
cility groups.)
4.72Before assigning an LCR advance limit, deter-
minations should be made as to exactly how many facil-ity groups a station user may be allowed to advance
through, should the less expensive facility group trunks
be busy. Consideration should be given as to how impor-
tant it is that the call go out immediately, or whether it is
more important that the caller wait for a less expensive
trunk to become available.
4.73An LCR advance limit is assigned to each sta-
tion, even those not assigned LCR Only (SCOS 6). Each
station is given an advance limit of 1 to 22, “unlimited,”or 
%o advance.” The l-22 designations indicate the
mrmber of facility groups through which the station can
advance. Stations with “no advance” will not advance
past the first facility group in each route group, stations
with “1” may advance once (to the next programmed fa-
cility group), and so on. Stations with the 
“un.Emited”
designation may advance through all programmed facil-
ity groups in each route group. The default designation
for all stations is “unlimited.”
4.74If a station is restricted 
from the trunks in a facil-
ity group or if the LCR-modified telephone number is
toll restricted due to its station class of service, the sys-
tem will immediately proceed to the next facility group
and will count this as one advancement.NOTE LCR advance limit assignment applies to all
route groups and all time blocks.Page 4-33 
						

							INTER-TELPRACTICESJMX/GMX 256 INSTACLATON & MAINTENANCE
K. 
E&MTRUNK!S
NOTE: This feature is available only in the Extended
plus Tl and E&U software packages.
4.75F&M trunks, also called “tie” lines, are special
trunks that tie two distant 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.Incoming E&M Calls
4.76There are two modes of ring-in for E&M trunkx
auto ring-in and dial-repeating.
Auto ring-in E&M trunks, like standard trunks, may
be programmed to ring in to individual stations, mul-
tiple stations, or hunt groups or as a DISA call. (If
programmed to ring in at a single station, the E&M
call will follow any programmed forward.)
Dial-repeating E&M trunks perform a “handshake”
with the other telephone system and allow the callers
to dial an extension number or a trunk access code
for placing an outgoing call. The handshake can beimmediate-dial, delayed-start, or wink-start, de-
pending on the E.&M trunk installed (defaults to im-mediate-dial). The programmer can also determine
whether the caller will hear dial tone (defaulted with
dial tones enabled) and whether reorder 
tones will be
presented as a burst of tones or continuous tones (de-
faults to burst of tone).
Outgoing E&M Calls
4.77
E&M trunk groups are programmed for day and
night mode outgoing access like standard trunk groups.4.78 E&M trunks can be assigned to LCR facility
groups to route outgoing calls through the other tele-
phone system. This is useful when a call that is placed
from one telephone system would be a local call on the
other system. The “long distance” call could be placed
using LCR, routed through the E&M trunk group, and
go out of the other telephone system as a local call. (The
LCR facility group would have to have dial rules pro-grammed to dial the other telephone system’s trunk
access code as well as sending the dialed telephone
number.)
4.79When the system is in the default configuration,
all E&M trunks are configured for 
DTMF signaling. Ifnecessary, some or all of the 
trunks can be repro-
grammed for dial-pulse signaling through database pro-If?--
Page 4-34 
						

							INTER-TELPRACITCESIMWGMX 256 INSTALLATION & MAINTENANCEIssue 1, No”==
L TlsPANsNOTE: This feature is available only in the 
Etiendd
plus Tl and E&M software packages.
4.80The term “Tl” refers to a specific digital method
of transmitting voice and data; it is the basic 
24-channel
time-division multiplex, pulse code modulation system
used in the United States. Since each 
Tl span actually
consists of 24 individual circuits (or channels) multi-
plexed together, it is often less expensive to purchase a
single 
Tl trunk than it is to purchase multiple individual
trunks.
4.81Fractional 
Tl (FIT) that uses fewer than the stan-
dard 24 circuits, can be used on the 256 System. 
JfFJ’l isused, the 
unused circuits of the TlC must be un-
equipped. Refer toPROGRAMMING,page 5-172, fordetails.
4.82Although most Tl interfaces will be with the
public network, it is possible to use a Tl trunk to connect
two telephone systems together (e.g., two 256 Systems
in the same building or in two buildings and connected
with a repeater). Refer to Figure 4-l on the next page for
examples of 
Tl applications. Also refer to PROGRAM-
MING, page 5-122, for special procedures required for
each type of installation.
4.83When purchasing a Tl span, there are several
variables involved, depending on the Tl application re-
quired. (Refer to 
SPECIFICAI’IONS, page 2-17, for de-
tails.) The variables include the following:
Card type: The type of framing scheme used by the
Tl trunks connected to the card can be D4 Super-
frame (normally used for voice transmissions) or
Extended Superframe @SF is usually used for data
transmissions).
Zero code suppression scheme: The Tl trunk xero-
suppression scheme (that limits the 
numbef of con-
secutive 
xeroes in transmissions) for the trunks on
the 
Tl card can be AMI (Bit 7), Bipolar Eight Zero
Substitution 
(BfZS), or “None.”PCM encoding law: 
In pulse code modulation
(FCMJ systems, there are two primary methods ofencoding analog signals (sampled audio 
wave-forms) into digital signals. 
In North America and Ja-
pan, the “mu-law” (p-law) method is normally used.
In other places like Europe, the “A-law” method is
widely used. The programmer must select both the
transmit and receive method of encoding used by the
Tl Card. In the United States, this will almost al-
ways be mu-law to mu-law.
Relay activation: If desired, you can enable one or
both of the two relays on the 
Tl Card. If enabled, youcan attach a signaling device (such as a light or
alarm) and select whether the relay is activated for a
“Tl line error” or to indicate “Tl line OK”
Channel service unit 
(CSUJ or DSX-1 Interface:
In some applications, an optional on-board CSU isinstalled on the 
Tl Card. In other applications, a
DSX-1 Interface will be used. Figure 4-l shows sev-
eral possible applications.
- Line build-out (LBO): Ifthe optional on-board
CSU is installed, the LB0 attenuation of the Tl
trunk connected to the card must be designated in
programming. This value is determined by the
distance to the nearest public network 
Tl repeat-
er.
- DSX-1 line length: If the optional on-board
CSU is nor installed, the length of the cabling be-
tween the 
Tl Card and the external CSU, or be-
tween the 
Tl Card and the other telephone sys-
tem to which it is connected must be designatedinprogramming.
Reference clock programming: If the 
Tl Card is
connected to the public network, the card is auto-
matically designated as a slave clock (the 
publicnet-
work always acts as the master clock and the firstslave clock provides the 256 System reference
clock; all other slave clocks act as backups). If the
card is not connected to the public network, but is
instead connected to another 
Tl Card or a card in an-
other telephone system, it can be a master clock or a
slave clock (in relation to the card on the other end).
If the card is a master, the card’s on-board oscillator
can be the source of the clock or it can rely on an ex-
ternal clock.Page 4-35 
						

							INTER-TELPRAcTICEsIMWGMX 256 INSTALLATION & MAINTENANCE
FIGURE 4-l.Tl SPAN APPLICATIONS\
j
256-to-CO with external CSUIn this application, the TlCs are connected to the central office using an external
In this application, the 
TlCs are connected directly to the central office and optional
on-board Csus are used. The line buildout is programmed to match the distant to
the CO (or nearest repeater), up to 6000 feet. Both cards draw reference clock from
the public network and are slave clocks One card is designated as the system refer-
enceclock.
256-b-256 DSX-1 with qeater(s)Here, two 256 Systems are connected through a Tl repeater. Both TlCs have the
DSX-1 Interface enabled. The length of cabling to the repeater (up to 655 feet) iswork’> Both 
TlCs are programmed as reference cl& for their 256 Systems
256-to-256 DSX-1 without qcatcrin this example, the two 2.56 Systems are connected directly. Both TlCs have theESX-1 Interface enabled and the length of cabling between the two systems (up to
(which does not receive reference clock from the public network) and the other isEw---$l 6ssf~)~~~t~iqpmgramming.~e~d~~~~~~e~cla(r
the slave clock (that recewes reference from the master clock actmg as the‘pubhcnetwork”). Both TlCs are programmul as reference clocks for their 256 Systems
In this application, two 
256 Systems are connected through a Tl repeater. Both TlCshave the on-board Csu enabled and the line buildout is programmed to match the~totheTlrepeata(ppto6000feet)foreachTlCOnecardisdwignatedasthe master clock (which does not receive reference clock from the public network)
and the other is the slave clock (that receives reference from the master clock acting
as the “public network”). One card is designated as the 
mastet clock and the other as
256-to-256 CSU without repeaterIn this application, two 266 Systems are connected directly to each other. The TlCsboth have on-board C3Js enabled and the line buildout is programmed to match the
dii between the 256 Systems (up to 6C0l feet) for each TlC One card is desig-nated as the master clock(whichdoes not receive reference clock from the public
Sample Tl NetwoxicIn a Tl network that involves multiple CO and TIC connections, the CSWDSX-1
variable is determmed by each connection. In the example shown here, the twoT1C.s connected to the CO receive reference clock from the public network and areslave clocks The two that are connecting the 256 Systems do not draw referencefrom the public network. TlC #2 on 256 Xl is the master clock and TlC #l on 256
Page 4-36