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

							ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-53
GENERIC 2
Depending on whether the switch provides private network ISDN service or public network ISDN
services, whether the switch functions as an endpoint or as a tandem node, will determine whether other
features should be administered before ISDN-PRI. Primarily, these other features include tandem tie
trunk access, trunk-to-trunk calling, and miscellaneous trunk restrictions. When applicable, these
features are administered with procedures 275, word 1, 110, 111, 102, and 010, word 3.½
Procedure 275 Word 4: ISDN Service — Enable/Disable
Screen-based procedure 275 is used to translate the system COS assignments as well as several other
miscellaneous services and features. Word 4 provides the capability for enabling and disabling the
ISDN service. Figure 7-25, Procedure 275 Word 4: System COS and Miscellaneous Service½
½
Assignments (Generic 2), depicts this procedure.
ENHANCED MODE — PROCEDURE: 275, WORD: 4
SYSTEM COS — MISCELLANEOUS
1.
3.Traditional Code Calling Access Digits:
Trunk-to-Trunk Transfer:
ATTENDANT RELEASE LOOP OPERATION
4.
5.Status:
Timed Recall Timer:
14. ISDN Status:
6. Default Recent Disconnect Inteval:
MAXIMUM PREEMPTION LEVELADMINISTRABLE ALARMS
7. All Incoming:
OUTGOING15.
16.
17.Even Port Peripherals:
Trunk Software:
Auxiliary Software:
8.
9.Terminal:
Attendant:DISPLAY ONLY
18. Local Switch Number:
10.
11.
12.
13.AUTOVON Interface Switch:
ACD Abandon Call Search:
MLL Status:
CMS Status:
Connected to CC0 ON-LINE
enter command:
Figure 7-25. Procedure 275 Word 4: System COS and Miscellaneous Service Assignments (Generic 2)½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-54ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2
Field 14For Generic 2, field 14 must always be translated. Field encodes and their descriptions
are:½
—
0
1(Dash) required when ISDN is not provided. Current policy is to always ship
ISDN-PRI software with the switch. However, the administration software still
provides the option to assign this software as unprovided.
Must be translated when ISDN is provided but disabled.
Must be translated to enable ISDN service.½
½
½
½
Procedure 276 Word 1: Other Feature Groups
Use this procedure to turn on optional networking features such as AAR, DCS, SNC, Look-Ahead
Interflow, and Integrated Telemarketing Gateway (ITG) or to see which of these features are turned on.
Figure 7-26, Procedure 276 Word 1: Feature Group COS (Generic 2), depicts this procedure.½
½
½
ENHANCED MODE — PROCEDURE: 276, WORD: 1
FEATURE GROUP CLASS OF SERVICE
1.
2.
3.
4.
5.
6.
7.
9.
10.Standard Network:
Multipremise:
DCS:
AUTOVON:
Call Vectoring:
Tenant Services:
System 85 SE:
Look-Ahead Interflow:
Integrated Telemarketing Gateway:
DISPLAY ONLY
11. Use Procedure:
Connected to CC0 ON-LINE
enter command:
Figure 7-26. Procedure 276 Word 1: Feature Group COS (Generic 2)½
Procedure 250 Word 1: SC/DS1 — Carrier Designation
This procedure is used to assign the equipment carriers to a module and cabinet. Additionally, it is used
to assign the type of carrier, the carrier port electrical number, and whether the carrier is equipped with
a TN463 synchronization clock (SC). Figure 7-27, Procedure 250 Word 1: System Configuration —
Carriers (Generic 2), depicts this procedure.½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-55
ENHANCED MODE — PROCEDURE: 250, WORD: 1
CARRIERS
CARRIER LOCATIONLOCAL RMI LOCATION
1.
2.
3.Module:
Cabinet:
Carrier:
12.
13.
14.
15.Module:
Cabinet:
Carrier:
Slot:
4. Carrier Type:
MODULE CONTROL
5.
6.
7.
8.I/O:
PDS:
Duplicated:
TMS:
9.
10.
11.Port Electrical Carrier:
TMS Electrical Carrier:
SC Equipped:
Connected to CC0 ON-LINE
enter command:
Figure 7-27. Procedure 250 Word 1: System Configuration — Carriers (Generic 2)½
DS1 circuit packs may only be installed within DS1 port carriers. Each Generic 2 that is equipped with
one or more DS1s will also contain either a TN463 SC or a TN2131C. For single-module systems, the½
SC is located in the module control carrier along with the TN460 module clock. For multimodule
systems, the SC is located in the TMS carrier.½
Fields 1-3
Identifies a module number, cabinet number, and physical carrier position. The
appropriate encodes are determined based on whether the module is traditional or
universal and the physical equipment location, refer to table 7-6, Equipment
Parameters and Permitted Translation Encodes.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-56ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2
Field 4Translates a particular type of carrier (such as DS1/MFAT, module control, or TMS) to
the equipment location identified by fields 1-3. For DS1/DMI/ISDN-PRI applications,
field encodes and their descriptions are:½
2 Universal Module Control 0
3 Universal Module Control 1
4 TMS 0 Control
5 TMS 0 Growth
6 Traditional Module Control 0
7 Traditional Module Control 1
8 TMS 1 Control
9 TMS 1 Growth
10 Universal port
11 DS1 port carrier
Depending on whether the purpose for translating this procedure is to assign the SC
or to assign a DS1 port carrier will determine which encode to select.
Fields 5-10DS1/DMI/ISDN-PRI does not place any additional requirements on translating these
fields.
Field 11
Field encodes and their descriptions are:
0 Translated for external synchronization, when the carrier (which is identified by
fields 1-10) is not equipped with an SC.
1 When the carrier (module control or TMS) is equipped with an SC.½
NOTE: The network synchronization diagram should be available, and is
required, to determine how to properly synchronized the switch.
Fields 12-15
Not applicable for DS1/DMI/ISDN-PRI applications. Therefore, a dash (–) is
appropriate.
Procedure 260 Word 1: DS1/DMI/ISDN-PRI Physical Interface
Procedure 260 is required to administer each DS1. For traditional modules, the ANN11 circuit pack
provides DS1/DMI-BOS services while the ANN35 provides DMI-MOS/ISDN-PRI services. For
universal modules, the TN767 circuit pack provides DS1/DMI services while the TN767/TN555 pair
provides ISDN-PRI services. Figure 7-28, Procedure 260 Word 1: Additional DMI-MOS/ISDN-PRI
Circuit Pack Assignments (Generic 2), depicts this procedure.½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-57
ENHANCED MODE — PROCEDURE: 260, WORD: 1
DS1/ISDN AND RG CIRCUIT PACK ASSIGNMENTS
EQUIPMENT LOCATIONSC
1.
2.
3.
4.Module:
Cabinet:
Carrier:
Slot:
12.
13.Equipment Type:SC Reference:
SIGNALING14.
15.
16.
17.
18.
19.Application:
Bit Inversion:Link Type:
SA/FX:
Loop Length:
E Bit:
6.
7.
8.
9.
Framing:
23B+D/24B:
24C/RBS:
ZCS/ B8ZS:
10.
11.Slip Enable:External Loop:
DISPLAY ONLY
20. SC Information:
Connected to CC0 ON-LINE
enter command:
Figure 7-28. Procedure 260 Word 1: Additional DMI-MOS/ISDN-PRI Circuit Pack Assignments
(Generic 2)½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-58ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2
Fields 1-4Assigns the circuit pack to an equipment location. Table 7-6, Equipment Parameters
and Permitted Translation Encodes, depicts the permitted ranges for these encodes.
TABLE 7-6. Equipment Parameters and Permitted Translation Encodes
Equipment
Parameter
Traditional
ModuleUniversal
Module
Module Number0-300-30
Cabinet Number
0-7
0
DS1 Carrier ID
0-3
c-e
Slot Numbers (Note 1)
ISDN-PRI Trunks
Line+Trunk Mode
OPS Line-Only Mode5 and 18 (Note 2)1-19 (Note 3)
5 and 18 (Note 2)
1-19 (Note 4)0, 5, 13, and 181-19 (Note 5)
NOTES:
The circuit pack application type (Field 14) will to a large degree determine which slots may be
used.
When a DS1/MFAT carrier is configured with two DS1s, physical slots 3, 8, 16, and 21 are
available for other applications. If only one DS1 is configured, then six additional slots are
available for other applications. 1.
2.
3.
4.
5.When the slot is used for ISDN-PRI trunk applications the adjacent right slot must be configured
with the TN555 circuit pack, except in nonfacility associated signaling (NFAS) arrangements that
have no D-channel on this DS1 link.½
When used for a mixture of lines and trunks (two slots are required) the adjacent right slot must
remain vacant.
When used for OPS line applications, there is no requirement to leave a vacant slot to the right.
Actually, all 19 slots (1 through 19 consecutively) may be used to provide OPS. However, it is
still recomended that the slot to the right remain vacant to accommodate future changes.
Field 6
Used for assigning the framing format. The choices are D4 and ESF (previously called
F ).
e½
The choice of framing format is totally dependent on the equipment connected to the
interface (such as D4-channel bank, CDM, BCM32000, host computer, and other
switches). Normally the format is not dependent on facilities used, but there could be
some older digital radio equipment that only supports D4. The ESF format consists of
a better framing algorithm and therefore provides more reliable error detection than
D4. The ESF is the preferred selection for System 75-to-System 75, System 75-to-
Generic 1 or -Generic 2, System 75-to-System 85, System 85-to-System 85, System 85-
to-Generic 1 or -Generic 2 T1-spans. The D4 format should be selected for T1-spans
connecting D4-channel banks and CDMs since they do not typically support ESF.½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-59
Field 7If field 14 is defined as non-ISDN (0, 1, or 2) this field is equivalent to the Per-
Channel Signaling and common channel signaling options used with System 85 R2V4.
However, the terms have been changed to facility associated signaling (FAS) and
NFAS.½
If field 14 is defined as ISDN (5), this field is used to specify the method used to
construct signaling bits for each DS0 B-channel. The 23B + 1D option is also called
FAS. If this interface contains a D-channel (23B + 1D), if it is a DS1/DMI link, or if it
is an ISDN-PRI link that transmits B-channel signaling information with that particular
DS1 link, assign a 0 here.½
½
½
½
½
½
½
½
½
½
½
½
Field 8If this facility contains all ISDN B-channels (24B), assign a 1 here. The 24B option
is also called NFAS. It is required for those ISDN-PRI links that have their B-channel
signaling information transmitted over a different ISDN-PRI link. For each ISDN-PRI
facility using NFAS, that facility must be translated as part of a D-channel group in
procedure 116, word 1. Each D-channel group number must be associated with a
particular ISDN-PRI facility that transmits the signaling for all links within the group.
The (23B + 1D) ISDN-PRI equipment location that provides this capability is called the
primary D-channel. Reliability may be increased by administering an alternate
(23B + 1D) ISDN-PRI equipment location as the backup D-channel (as administered
with procedure 262, word 2).
Offers the choice of 24th-channel or RBS. The choice of signaling method used is
dependent on the application. The DS1/DMI-BOS applications may be translated for
either option. However, non-NFAS ISDN-PRI applications always require that 24th-
channel signaling be selected. With NFAS, it is possible that no D-channel exists for
this DS1 link.½
½
24th-channel signaling multiplexes all signaling information for channels 1 through 23
into the 24th channel. This makes available the full 64K-bps bandwidth (of channels 1
through 23) for voice and/or digital data transmission.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-60ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2
Field 9Assigns the line coding format that will be used to forcibly ensure that the data meets
T1-carrier ones-density requirement. Field encodes and their descriptions are:
l    Zero Code Suppression (ZCS)
l    Bipolar 8 Zero Code Suppression (B8ZS).
The ZCS line-coding format (restricted) scans each byte for the all-zeroes octet and, on
detecting this bit sequence, substitutes a one for the zero in bit position 2. The ZCS
format is the most common and is used widely. The ZCS format can be used (without
any consideration of the communications protocol) to transmit 7-bit characters/data at
rates up through 56K-bps via modems and multiplexers that do bit-stuffing. If the data
communications protocol is based on the high-level data link (HDLC) protocol (that is,
mode 2/3) and data is transmitted as inverted-HDLC, then the ZCS option can be used
for data rates up through 64K-bps. The data modules (both DCP and BRI) use the
DCP protocol and BRI protocol respectively. Both DCP and BRI are based on the
null based DMI specification, and therefore meet these requirements.½
½
Those DS1/T1 facilities that use RBS and are optioned for ZCS maintain the ones-
density requirement by converting all-zero octets in the transmit PCM stream of each
channel to a string of seven zeros and a one. This does not significantly affect voice
and voiceband data since it is in analog (PCM) form. For DS1/T1 facilities that use
24th-channel signaling and are optioned for ZCS, the data communications
protocol/communications equipment used must prevent the all-zeroes octet from
occurring; otherwise, the ZCS method will forcibly alter the data (causing errors) to
guarantee proper ones-density.½
The B8ZS line-coding format (unrestricted) substitutes a unique code (bipolar violation
code) for any eight consecutive zeros. This bipolar violation code is detected at the
receiving end and converted back to the original string of eight zeros. The B8ZS
encoding method permits data transmission at rates up through 64K-bps without
consideration of the protocol clear channel transmission.
CAUTIONSeveral different types of network digital facilities may be linked
together to complete the end-to-end connection. Typically, these will be
multiplex-derived facilities. Usually, the multiplexers will contain a
bipolar violation monitor and removal circuit that corrects all bipolar
violations (alters B8ZS type data) and also produces an all ones if a loss
of input signal occurs. This bipolar violation monitor and removal
feature is currently an inherent part of the MX3, M13, MX2, and M1C
multiplexers, as well as most vendor’s multiplexers.½
½
½
½
½
½
½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 27-61
Field 10This option enables (1) or disable (0) collection of slip data to support excessive slip
rate based on switching between the primary, secondary, or internal high-accuracy
clocks. The decision to switch from one source to the other is normally based on an
internal slip count calculation (software record). However, hardware events (such as
primary link failures) may take precedence over any software controls.½
½
½
Slips are caused by differences in clock frequencies. A slip results in the deletion or
repetition of a single frame. Slips are not caused by noise on the line.
Those DS1/T1 spans that are used to provide the primary and secondary
synchronization reference should be administered for slip enable (1). Since the switch
software does this automatically, this task is not mandatory but is a good procedure to
follow. Typically, those other DS1/T1 spans that are used for data applications and
that are deemed important should also be administered for slip enable. This excludes
all T1-spans connecting channel banks, unless the channel bank is externally timed.
Normally, those DS1/T1 spans that are used exclusively for voice and that are not
assigned as the primary or secondary synchronization source should be administered
for slip disable (0). The goal is to keep that reference on-line, which minimizes slips
for all those DS1s for which slips can’t be tolerated.½
The digital switch always maintains a slip count record for each DS1. Slip counts are
calculated on a 24-hour continuous interval. As a historical record, the slip counts for
each DS1 are maintained for the last 24 consecutive intervals. The slip count is used
to determine if a DS1-span is experiencing errors and, if so, the severity of the errors
(type alarm).
If the primary facility uses 24th-channel signaling and if the secondary facility uses
RBS, then the primary will always be on-line unless a hardware event forces a switch
to the secondary. A software algorithm is used to select the facility (primary or
secondary) that is on-line for the cases where:
a.
b.
Both primary and secondary facilities use the same type of signaling (either
24th-channel or RBS)
The primary uses robbed-bit and the secondary uses 24th-channel signaling
Criteria for Switching to the Secondary
If as many as 50% of those spans that are administered for slip enable are experiencing
slips (with respect to the primary), then a decision is made to switch to the secondary.
On switching to the secondary, a software bit is set making the primary appear as
though it has exceeded its maximum slip limit. At this point, the primary is not
evaluated again for 1 hour.½
Criteria for Switching Back to the Primary
At the end of the 1-hour interval, the slip count is analyzed. If the primary slip count
is less than 2, then a switch back to the primary is made. Also, if the primary has a
slip count of 44 or less and if the secondary and 50% of those DS1s that are enabled
for slip enable have reached their maximum slip count of 88, then a switch back to the
primary is made.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-62ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2
Field 11Offers the options external loop not available (0) or available (1).
The external loop available option should be selected only when demand diagnostic
maintenance is done and then only after the interface has been busied out. This option
is used with procedure 620, test 2, to extend the range of the test to include the
network channel-terminating equipment (NCTE) and the connecting facility (any
external equipment to the point of the DS1 loop around). The test requires that either
the colocated or the distant NCTE be physically optioned for loopback mode.
The external loop available option should be used only for the duration of a test.
Specifies whether (1) or not (0) the associated T1-span is used as an incoming
synchronization source to the switch. The network synchronization diagram should
show those transmission facilities that are used for synchronization. Each switch
permits a maximum of two interfaces (one primary and one secondary) to be translated
here. However, there is no requirement to have both.
When a Generic 2 is the master timing server, neither primary or secondary is
administered. Each Generic 2 that is equipped with a DS1 will also contain a TN463
synchronization clock synchronizer (SC). For single-module systems, the SC is located
in the module control carrier along with the TN460 module clock. For multimodule
systems, the SC is located in the TMS carrier. The SC should have previously been
assigned in procedure 250.½
½
½
½
Field 12½
½
½
½
½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4