ATT Definity Addendum 1 For Ds1, Dmi, Isdn Pri Instructions Manual

							ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V5 & GENERIC 17-163
BCC Values
Each routing pattern preference (1 through 6) has an associated BCC Value field.
Therefore, when a preference is translated, the associated BCC must also be translated.
A trunk group preference must be valid for one or more BCC values. Permitted
entries are y to enable the value and n to disable the value.½
A route can only be selected when there is compatibility (a match) with the BCC of
the call originating extension or facility and a BCC value specified in the routing
pattern.
Service/Feature This field is not used by the AAR software, but is required by the ARS software if the
trunk group specified is CBC. Permitted entries include any of the predefined or
additional Services/Features listed in the name field of the 
NETWORK-FACILITIES screen.
NOTE: If the IXC is AT&T and the public network connection is to a 4ESS
digital switch that is configured with either 4e11 or 4e12 generic software, then
the Service/Feature field must be completed for all entries except ACCUNET
switched digital service. For ACCUNET, this field should be left blank; however,
the BCC field must be administered n y n n n. If a 4ESS is configured with
4e13 generic software, then the Service/Feature field must be completed for every
entry — including ACCUNET.
BandPermitted entries are numbers 0 through 255 (which corresponds to outgoing-WATS
bands 0 through 255).
NOTE: This field is only displayed when the Service/Feature field is translated
outwats-bnd.
Hunt Group — ISDN-PRI Applications
This main reason for using this screen (within an ISDN-PRI environment) is to support any of the call
management/call distribution systems. Figure 7-88, Hunt Group Screen, depicts this procedure.½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-164ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V5 & GENERIC 1½
HUNT GROUPPage 1 of 6
Group Number:Group Extension:
—Group Type: ucd
Group Name:Coverage Path:
COR: 1Security Code:Message Center: noneACD? n
Queue? nNight Service Destination:
ISDN Caller Disp:
Figure 7-88. Hunt Group Screen
Only the new ISDN-PRI service application fields or those fields that require special or additional
considerations are mentioned here.
ISDN Caller
Specifies whether the hunt group name or the member name will be sent to the
Disporiginating extension. Field encodes and their descriptions are:
l    grp-name — specifies that the hunt group name will be displayed on the
originating extension display.
l    mbr-name — specifies that the hunt group member name will be sent to the
originating extension.
Terminating Extension Group — ISDN-PRI Applications
If the extension is part of a Terminating-Extension Group (TEG) then the voice terminal can be assigned
a TEG button and associated status lamp. Furthermore, if the voice terminal has a digital display, then
(depending on administration details) either the TEG group name or TEG member name can be
displayed. Figure 7-89, Terminating Extension Group Screen, depicts this procedure.½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V5 & GENERIC 17-165½
ExtName3:
4:
TERMINATING EXTENSION GROUPPage 1 of 1
Group Number:Group Extension:
—
Group Name:Coverage Path:
Security Code:COR: 1_
ISDN Caller Display:
GROUP MEMBER ASSIGNMENTS
ExtName1:
2:
Figure 7-89. Terminating Extension Group Screen
ISDN CallerSpecifies whether the hunt group name or the member name will be sent to the
Display
originating extension. Field encodes and their descriptions are:
l     grp-name — specifies that the TEG group name will be sent to the originating
extension.
l     mbr-name — specifies that the TEG member name will be sent to the originating
extension.
Signaling Group — ISDN-PRI Applications
R1V5 Only
When the 
DS1 CIRCUIT PACK screen has the Signaling Mode field administered as isdn-ext, the
SIGNALING GROUP screen is used for FAS and NFAS administration. For FAS, this screen designates the
D-channel used as the signal channel for all B-channels on that board.
For NFAS, this screen designates the D-channel pairs used for D-channel backup.
It also provides for the assignment of Interface IDs to DS1 interfaces within the Signaling Group.
A signaling group can correspond to more than one DS1. The 
DS1 CIRCUIT PACK screen shows how
B-channels and their associated signaling D-channel are related. Figure 7-90, Signaling Group Screen,
depicts this procedure.
NOTE: The 
TRUNK GROUP screen must be used after administering this screen to assign individual
trunks to trunk groups.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-166ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V5 & GENERIC 1
Group Number: 1
Trunk Brd
1:1B152:1B163:1B174:
5:
6:
7:
8:
9:
10:
SIGNALING GROUPPage 1 of 1
Associated Signaling? nPrimary D-Channel: 1B1524
Secondary D-Channel: 1B1624
Interface ID
1
2
3Trunk Brd
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:Interface ID
Group
Number
Associated
Signaling
Primary D-
Channel
Secondary
D-Channel
Trunk BrdFigure 7-90. Signaling Group Screen½
½
½
½
½
½
½
½
½
A number that associates the D-channel pair used to signal for a group of trunk boards.½
Assigns whether this signaling group uses FAS (y) or NFAS (n).½
This field appears for both FAS and NFAS. For FAS, this field specifies which
channel will be used as the D-channel to signal for all B-channels on that board. This
channel will not signal for any other board.½
½
½
For NFAS (that is, when the Associated Signaling field is set to n), this field
is the D-channel assigned as the primary signaling channel for those trunk boards in
this signaling group.½
½
½
This field appears for NFAS only and specifies the D-channel assigned as the
secondary (backup) signaling channel for those trunk boards in this signaling group. If
the primary D-channel fails, this channel is used instead. For this reason, the
secondary D-channel should be on another board than the primary D-channel.½
½
½
½
This field appears for NFAS only and specifies the trunk boards assigned to this
signaling group. All channels on these boards (except for those channels listed as the
primary and secondary D-channels) are used as B-channels.½
½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V5 & GENERIC 17-167
Interface ID½This field appears for NFAS only and specifies an ID that associates the D-channels
allowed to signal this trunk board from the D-channels available on any trunk board.½
½
For example, if a trunk board has a D-channel, then this board must be signaled by
only one D-channel pair (that is, one signaling group). Here, this trunk board can have
only one interface ID.½
½
½
But if a trunk board has no D-channel (all channels are B-channels), this board can be
signaled by D-channels in this and other signaling groups. This ID associates this
trunk board to the D-channels that will provide signaling for it so that a board can be
listed in more than one signaling group. Here, this trunk board can have several
interface IDs.½
½
½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-168ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V5 & GENERIC 1
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							MAINTENANCE AND ALARMS8-7
Summary of Generic 1 Maintenance Capabilities½
Since Generic 1 implements the same DS1, DMI, and ISDN-PRI protocols as Generic 2, both switches
provide the same maintenance capabilities. Since Generic 1 DS1s provide comprehensive detection
capabilities, the switch usually detects errors caused by network facilities even though an alarm will not
trip.½
½
ALARMS
Unlike analog port circuit packs, a DS1 has two categories of alarm signals: circuit-pack-level and
facility. Service may be interrupted by either of these alarms. Circuit-pack-level alarms show problems
with the circuit pack. Facility alarms show incorrect administration of the interface, cabling between the
two switch interfaces, failures in the facility equipment, and performance of the transmission facility.
(For facility problems, AT&T maintenance responsibility ends at the network interface.)
Circuit Pack Alarms
There are several types of circuit pack alarms that may arise. These are briefly described next.
Yellow LED
On power-up or initialization, the microprocessor executes a thorough set of tests on the circuit-pack
hardware. During this test sequence, the green LED stays on. Failure of any of these initialization tests
is shown by a flashing yellow LED. The yellow LED flashes following initialization because of power-
up or software requests but does not flash if any failures are detected while the interface is online.
Following successful initialization, the yellow LED not flash until the circuit pack is administered and
until the D-channel is communicating with the far end. As long as the D-channel is up and
communication is established, the LED stays on to show a busy state.½
½
½
½
Red LED½
The red LED is controlled by the microprocessor. During this test sequence, the green LED stays on.
If any background tests fail (which the processor runs during normal online operation), the red LED is
turned on. An example would be a failure of the tests run on the circuits that generate a DS1s signal.
If hardware problems exist, then either the circuit pack will fail power-up initialization tests or the red
LED is turned on within several seconds of power-up initialization. If the red LED remains off
following initialization, a transient problem may be assumed to have occurred.½
½
½
NOTE: The circuit pack may fail the initialization tests for reasons other than bad hardware.
Known cases are port data interface or port data store problems and synchronization subsystem
problems. An example of the latter would be an online clock reference that has been externally
looped to itself. These problems are evidenced by all DS1s in a module or in the system failing to
initialize properly.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							8-8MAINTENANCE AND ALARMS
Facility Alarms
There are several types of facility alarms that may arise. These are briefly described next.
Excessive Slips
Data received from a DS1 facility is stored (clocked) into buffers on the circuit pack using a clock
signal derived from the received signal. Data is read from the same buffers using a clock derived from
the master clock. If at any time these two clocks are not phase-locked, data will be stored into the
buffers at a rate different from the rate read from the buffers. This results in underflow or overflow of
the buffers, called slips.
Slips result in the repetition or deletion of one 8-bit word for every channel. The slip rate is monitored
by the circuit pack. The slip rate is used to determine if that DS1 being used as the system clock
reference is functioning properly. Slips cause pops in voice and voice-grade data signals and can cause
errors in digital data signals.
An example for a type of problem that will cause slips is having both switches (at each end of a DS1
facility) administered as timing masters instead of one being a master and the other using the received
DS1s signal from the master as a timing reference.
Excessive Misframe and CRC Errors
Misframes and cyclic redundancy check (CRC) errors may be produced by marginal or faulty line
repeaters, NCTE, noise on the transmission line, or by the circuitry that generates the framing pattern or
CRC at the transmit end.
Bit errors, in a DS1s signal, are detected via misframes when D4 framing is used and via CRC errors
when ESF is used.
The microprocessor keeps count of the number of misframe or CRC errors and uses the count to process
the minor and major alarms. The misframe or CRC count is used in choosing clock references for the
switch. Also, an unterminated transmission line could generate noise that looks like an DS1s signal.
The absence of a framing pattern or continuous CRC errors is used to show that it is not a DS1.
LFA Alarm
The receive DS1s signal should contain either the D4 or ESF framing pattern. Which framing pattern
is determined by administration details. The ANN35 has two green LEDs that function to show local
and remote framing status. Normally, both green LEDs will be on when the near end and far end are
framing properly.
When the (top) green LED is off, the near end interface cannot frame up on the DS1s signal. This
event is known as the LFA alarm. The LFA alarm is also known as the red alarm, because a red LED
lights on the D4-channel bank when this alarm is on.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							D. TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLES
This appendix contains three tables that define trunk type to signaling type compatibility for System 85,
R2V1 through R2V4, and Generic 2. Table D-1, Trunk/Signaling Cross-references, provides, on a
trunk-type basis, the default signaling type, the feature and direction compatibility, and the valid
signaling types. Table D-2, R2V4 Alternate Signaling Type Translations, provides, on a trunk-type
basis, a translation of other than the default, valid signaling type to standard signaling type for R2V4
trunks. This translation is necessary to use table D-3, Signaling Type Compatibility. This table
provides, on a signaling type basis, a compatibility matrix for the standard signaling types.
Table D-1, Trunk/Signaling Cross-references, shows for each trunk type what its default signaling type
value is and what other possible signaling types can be assigned to it. This table is valid for System 85
R2V1 through and Generic 2. R2V4 alternate signaling types must be translated by table D-2, R2V4
Alternate Signaling Type Translations.
The headings for table D-1, Trunk/Signaling Cross-references, are defined as follows:
TrunkA description of this trunk type. A signaling type or trunk type value enclosed in
Descriptionparenthesis such as (auto in) is not valid on a universal module.½
½
½
½
½
½
½
ProcedureProcedure encode for this trunk type
Encode
FeatureDefines the feature of the trunk type. Trunk types of like feature are compatible. The
feature abbreviations include:½
½
½
½
l
l
l
l
l
l
l
l
l
l
l
l
l
APLT - advanced private-line termination (includes both CCSA and EPSCS)
CAS - Centralized Attendant Service½
½
CO - central office
DID - Direct Inward Dialing
ETN - electronic tandem network
FX - foreign exchange
ISDN-PRI - Integrated Service Digital Network primary rate interface
MAIN/SAT - main/satellite
NA - Not applicable (trunk type doesn’t provide switch to switch connectivity)
NDMI - network digital multiplexed interface
RA - remote access
TIE - tie trunk
WATS - Wide Area Telecommunications Service½
½
½
½
½
½
½
½
½
½
½
D-1
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							D-2TRUNK TYPE AND SIGNALING TYPE COMPATIBILITY TABLES
Direction½Defines if the trunk type is capable of:
l     Incoming and outgoing calls — 2-way
l     Incoming calls only — 1-way in
l     Outgoing calls only — 1-way out
Signaling½
The signaling types available with this trunk type. When there are several signaling
Types½types available with this trunk type, the default signaling type is listed first.
Procedure½
The procedure encode for the listed signaling type½
½
½
½
½
½
½
½
Encode½
NOTE: Default signaling types are listed first.½
LEGEND:
Centralized Attendant ServiceLRB
delay dialLS
direct outward dialMS
dial pulseRLT
dial toneTT
ear and mouthWDDFOT
ground startWS
immediate start½
loop reverse battery
loop start
main-satellite
release link trunk
touch-tone
wink delay dial, fail on timeout
wink start
CAS
DD
DOD
DP
DT
E&M
GS
IS½
½
½
½
½
½
½
½
TABLE D-1. Trunk/Signaling Cross References
Trunk
DescriptionProcedure
EncodeFeatureDirection
Signaling
TypesProcedure
Encode½
½
½
intercom0
N/AN/A
none0
DP digit register1N/AN/A
none0
TT digit register2N/A
N/A
none0
attendant digit register3N/AN/A
none0
switched loop
4N/AN/A
none0
attendant conference
(5)N/AN/A
none0
general-purpose queing6N/A
N/A
none0
DT detector7N/AN/A
none0
unused8-11½
½
½
½
½
½
½
½
½
½
½
½
½
½
½
½
½
½
2-way CCSA DD in/out12APLT
2-wayE&M DD-in/wink DD-out wink-DT
9
2-way CCSA DD out, wink in
13APLT2-wayE&M WS in, DD out wink DT
10
2-way CCSSA DT out, DD in
14APLT2-way
E&M DD in, IS out
8
2-way CCSA DT out, wink in15APLT
2-wayE&M WS in, IS out
5
1-way in attendant completing/auto in16CO1-way in
GS
LS
DMI/ISDN-MOS
E&M auto in, IS out
E&M auto in, WS out1
1920
28
29
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4