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

							ADMINISTRATION OPTIONS AND REQUIRMENTS — SYSTEM 857-3
SYSTEM 85 (R2V1 THROUGH R2V4)
This part describes administration options and requirements for System 85 R2V1 through R2V4.
NOTE: Screens shown in the System 85 portion of this chapter are from the Manager II
administrative terminal. These fields correspond directly to the fields on flipcharts. That is, the
field 1 of procedure 275, word 4, on the Manager II screen is the same as field 1 of procedure 275,½
½
½
½
½
word 4, on the flipchart.
Procedure 275 Word 4: ISDN Service — Enable/Disable
Procedure 275 is used to translate the system class-of-service (COS) assignments as well as several other
miscellaneous services and features. Word 4 provides the capability for enabling and disabling the
ISDN service. Figure 7-1, Procedure 275 Word 4: System COS and Miscellaneous Service Assignments
(System 85 R2V4), depicts procedure 275, word 4.½
ENHANCED MODE - PROCEDURE:  275, WORD:  4SYSTEM COS – MISCELLANEOUS
1.
3.Code Calling Access Digits:
Trunk-to-Trunk Transfer:13.
14.CMS Status:
ISDN Status:
ATTENDANT RELEASE LOOP OPERATION
ADMINISTRABLE ALARMS
4.
5.Status:
Timed Recall Timer:15.
16.
17.Even Port Peripherals:
Trunk Software:
Auxillary Software:
6.Default Recent Disconnect Interval:
DISPLAY ONLY
MAXIMUM PREEMPTION LEVEL
18.Local Switch Number:
7.
All Incoming:
OUTGOING
8.
9.Terminal:Attendant:
10.
11.AUTOVAN Interface Switch:
ACD Abandon Call Search:
Connected to CC0 ON-LINE
enter command:
Figure 7-1. Procedure 275 Word 4: System COS and Miscellaneous Service Assignments (System 85
R2V4)½
½
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							7-4ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85
Field 14V4 Only
For System 85 R2V4, 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 show that this software is not provided.
Must be translated when ISDN is provided but disabled.½
ENHANCED MODE – PROCEDURE:  276, WORD:  1
Must be translated to enable ISDN service.
Procedure 276 Word 1: Other Feature Groups
Use this procedure to turn optional networking features such as AAR, DCS, SNC, Look-Ahead
Interflow, and Intergrated Telemarketing Gateway (ITG) or to see wich of these features are turned on.
Figure 7-2, Procedure 276 Word 1: Feture Group COS (System 85 R2V4), depicts this procedure.½
½
½
FEATURE GROUP CLASS OF SERVICE
1.
2.
3.
4.
5.
6.
7.
9.Standard Network:
Multipremise:
DCS:
AUTOVON:
Call Vectoring:
Tenant Services:
System 85 SE:
Look-Ahead Interflow:
10.Integrated Telemarketing Gateway:
DISPLAY ONLY
11.Use Procedure:½
Connected to CC0 ON-LINE*
enter command:
Figure 7-2. Procedure 276 Word 1: Feature Group COS (System 85 R2V4)½
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							ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-5
Procedure 250 Word 1: DS1 — Carrier Designation
Primarily, procedure 250 is used to assign the equipment carriers to a module and cabinet. Additionally,
it is also used to assign the type of carrier, the carrier port electrical number, and whether the carrier is
equipped with a synchronization clock (SC). Figure 7-3, Procedure 250 Word 1: System Configuration,½
Carriers (System 85 R2V4), depicts procedure 250, word 1.
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 7-3. Procedure 250 Word 1: System Configuration, Carriers (System 85 R2V4)
DS1 circuit packs may only be installed within DS1 port carriers. Each System 85 that is equipped with
one or more DS1s will also contain a TN463 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 located½
½
½
in the TMS carrier.
Fields 1-3
V1-V4
Identifies a module number (0-30), cabinet number (0-7), and physical carrier position
(0-3).
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							7-6ADMINISTRATION OPTIONS AND REQUIRMENTS — SYSTEM 85
Field 4V1-V4
Translates 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
the pertinent encodes are:½
4
5
6
7
8
9
11TMS 0 control
TMS 0 growth
Module control 0
Module control 1
TMS 1 control
TMS 1 growth
DS1/MFAT port carrier
Select a particular encode based on the intended purpose for translating this
procedure, either to assign the SC or to assign a DS1/MFAT carrier.
Fields 5-10
V1-V4
DS1/DMI/ISDN-PRI does not place any additional requirements on translating these
fields.
Field 11V1-V4
Field encodes and their descriptions are:
0
1When the carrier (which is identified by fields 1-10) is not equipped with an SC.
When an external synchronization clock is used, do not administer the SC. The SC
software functions are replaced by the hardware/firmware contained within the
external clock.
When the carrier (module control or TMS) is equipped with an SC. The network
synchronization plan should be available, and is required, to determine how to
properly synchronize the switch.½
Fields 12-15V1-V4
Not applicable for DS1/DMI/ISDN-PRI applications. Therefore, a dash (–) is
appropriate.
Procedure 260 Word 1: DS1/DMI/ISDN-PRI Physical Interface
System 85 R2V3 DS1 administration software (procedure 260) contains all the same fields, options, and
considerations as R2V1 and V2. Procedure 260 also provides a new field (14) for defining new
application types for DS1 facilities. The R2V3 systems require the ANN11C, ANN11D, or ANN11E
vintage circuit pack to provide the OPS line option. The ANN11D or ANN11E is required to provide
the DMI-BOS option.½
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							ADMINISTRATION OPTIONS AND REQUIRMENTS — SYSTEM 857-7
System 85 R2V1 and V2 only provide trunks. However, R2V3 and V4 provide trunks, analog OPS
lines, and DMI-BOS trunks. System 85 R2V4 (and later versions) provides DMI-BOS trunks; refer to
table 7-1, DS1 Administration — Channel Versus Line Assignments.½
½
Depending on the application type (encode) translated, there may be additional administration, slot, and
port grouping restrictions.½
Procedure 260 is used to administer the DS1/DMI/ISDN-PRI Interfaces (ANN11B, ANN11C, ANN11D,
ANN11E, or ANN35). Figure 7-4, Procedure 260 Word 1: System Configuration, Circuit Pack
Assignments (System85 R2V4), shows procedure 260, word 1.½
ENHANCED MODE – PROCEDURE:  260, WORD:  1DS1/ISDN AND RG CIRCUIT PACK ASSIGNMENTS
EQUIPMENT LOCATION
SC
1.
2.
3.
4.
Module:
Cabinet:
Carrier:
Slot:12.13.Equipment Type:
SC Reference:
14.
15.
16.
17.
Application:
Bit Inversion:
Link Type:
SA/FX:SIGNALING
6.
7.
8.9.
Framing:
PCS/CCS:
24C/RBS:
ZCS/B8ZS:DISPLAY ONLY
18.SC Information:
10.11.Slip Enable:
External Loop:
Connected to CC0 ON-LINE
enter command:
Figure 7-4. Procedure 260 Word 1: System Configuration, Circuit Pack Assignments (System 85R2V4)½
½
Fields 1-4V1-V4
Assigns the circuit pack to an equipment location. These assignments include the
module number (0 through 30), cabinet number (0 through 7), DS1/MFAT carrier
number (0 through 3), and slot number (5 or 18) for line plus trunk operation; or slot
numbers (0, 5, 13, or 18) for line-only operation.
System 85 R2V4 permits only trunk mode operation (that is, only slot numbers 5 or 18
can be assigned).½
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							7-8ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85
Field 5V1-V2
For DS1, 0 is the only choice.
V3-V4
This field is reserved for further use and contains a dash (–).
Field 6
Used for assigning the framing format. The choices are D4 and ESF (previously called
F ).½
e
The choice of framing format is totally dependent on the equipment connected to the
interface (such as D4-channel bank, channel-division multiplexer or CDM, channel-½
½
½
Field 7
V1-V4
expansion multiplexer or CEM, host computer, and other switches). Normally the
format is not dependent on facilities used, but older digital radio equipment may still
be in place that only supports D4. The extended superframe (ESF) format consists of
a better framing algorithm and therefore provides more reliable error detection than
D4. ESF is preferred for T1 spans from System 75-to-System 75, System 75-to-
Generic 1, System 75-to-Generic 2, System 75-to-System 85, System 85-to-System 85,
System 85-to-Generic 1, and System 85-to-Generic 2. The D4 format should be selected
for T1-spans connecting D4-channel banks and CDMs since they do not typically
support ESF.
V1-V4
Selects per-channel signaling or common-channel signaling. This option deals with the
way signaling bits are constructed for each DS0 channel. The default option is per-
channel signaling (0).
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-9
Field 8
V1-V4
Offers the choice of 24th-channel or robbed-bit signaling (RBS). The choice of
signaling method used is dependent on the application. The DS1/DMI-BOS
applications may be translated for either option. However, ISDN-PRI applications
always require that 24th-channel signaling be selected.
With RBS, information is transmitted in the least-significant bit (LSB) position of each
channel every six frames. This effectively limits the channel’s use to voice and
voiceband analog data applications. Digital data ports connected to Digital
Communications Protocol (DCP) data modules must use the modem pooling capability
to transmit data over DS1/T1 RBS facilities. Analog data ports must be configured
with analog modems.
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 called alternate voice/data
(AVD).
AVD allows 64K-bps digital data to be transmitted over those digital trunk facilities
that use 24th-channel signaling. Although AVD trunks are designed for digital data
transmission, they may also be used for voice transmission. However, because of a
modem-pooling limitation, AVD trunks cannot easily be used for analog voice-grade
data transmission.½
½
24th-channel signaling is required for those trunk groups that are translated AVD (from
procedure 101, field 17).
Either the AT&T proprietary format or the DMI-BOS format may be used with another
System 85 or System 75. The DMI-BOS format is required to provide 24th-channel
signaling capability with other vendors’ digital switches. 24th-channel signaling (both
methods) is not compatible with D4-channel banks. The AT&T proprietary format is
provided by the ANN11C version-8 (or later) circuit pack. All previous versions will
eventually be replaced via a class-A change. The DMI-BOS format is provided by the
ANN11D or ANN11E circuit pack. When 24th-channel signaling is optioned, the
ANN11D or ANN11E circuit pack automatically interrogates the far-end and provides
the required format. For System 75, the proprietary format is administered by
translating a n in the DMI-BOS field. To select the DMI-BOS format, simply
administer a y for the DMI-BOS field.½
½
V3-V4
A mode 1 data call requires a Line+Trunk-mode circuit pack with RBS option or ISDN.½
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							7-10ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85
Field 9V1-V4
Determines which line-coding format will be used to forcibly ensure that the data
meets T1-carrier ones-density requirement. The two choices are:
lZero code suppression (ZCS)
lBipolar 8 zero code suppression (B8ZS)
For a 56K-bps call over a robbed-bit facility, use the ACCUNET switched digital
service.
The ZCS line-coding format scans each byte for the all-zeroes octet and on detecting
this bit sequence, substitutes a one for the zero in bit position two. The ZCS format is
the most common and it is used widely. The ZCS format can be used (without any
consideration of the communications protocol) to transmit seven-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 control (HDLC) protocol
and data is transmitted as inverted HDLC, then the ZCS option can be used for data
rates up through 64K-bps.
System 85 and System 75 data modules use the DCP protocol. The DCP protocol is
based on the DMI specification (which uses HDLC mode 2,3 as a building platform)
and therefore meet these conditions.½
½
The DS1/T1 facilities that use RBS and are optioned for ZCS maintain the ones-
density requirement by converting any all-zeroes octet to a string of seven zeros and a
one. This does not significantly affect voice and voice-band data since it is in analog
(pulse-code modulation of 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.
The B8ZS line coding format 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 user
data protocol.½
Several different types of network digital facilities may be linked together to complete
the end-to-end connection. Typically, they will be multiplex-derived facilities.
Usually, the multiplexers will contain a bipolar violation monitor and removal circuit
that corrects all bipolar violations (alters B8ZS data) and also produces an all 1s 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 vendors multiplexers.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 857-11
Field 10V1-V4
This options enables (1) or disables (0) switching between the primary, secondary, or
internal high-accuracy clock. 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.
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.
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, other DS1/T1 spans that are used for data applications and 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,
DS1/T1 spans that are used exclusively for voice and 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 DS1/DMI
Interfaces for which slips cannot tolerated.
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
The slip count can be viewed in procedure 625 test 1.
Criteria for Switching to the Secondary Facility
If 50% of the spans administered for slip enable are experiencing slips (with respect to
the primary), then a decision is made to switch to the secondary. When a System 85
switches to its secondary, a software bit is set making the primary appear as though it
exceeded its maximum slip limit. The primary is not reevaluated for one hour.½
Criteria for Switching Back to the Primary Facility
At the end of the one-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. If the primary has a
slip count of 44 or less and if the secondary and 50% of those DS1s that are enabled
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							7-12ADMINISTRATION OPTIONS AND REQUIRMENTS — SYSTEM 85
for slip enable have reached their maximum slip count of 88, then a switch back to the
primary is made.
V1-V4 Field 11
Offers the options external loop not available (0) or external loop available (1). The
external loop available option should only be selected when demand diagnostic
maintenance is done and then only after a DS1 has been busied out. If DS1 is a
primary or secondary reference, the reference should be switched off line. 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.
The external loop available option should only be used for the duration of the test.
V1-V4Field 12
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 (1) in field 12. However, there is no
requirement to have both.
V1-V4 Field 13
Selects whether a DS1 facility (translated in field 12) is to be used as the primary or
secondary synchronization source to the switch. Field encodes and their descriptions
are:
0
1
2The facility is not used as a synchronization source
The facility is the primary synchronization source
The facility is the secondary synchronization source½
NOTE: The primary must be administered before the secondary. The secondary
must be removed before the primary.
Only slots translated (1) and (2) must be configured with synchronization cables.
These cables connect the backplane of the translated ANN11/ANN35 to the backplane
of the TN463. The cables are identified as group 334 for intercabinet and group 361
for intracabinet applications.½
CAUTIONA loop-timing problem can be created if the synchronization sources are
not administered correctly. The loop-timing problem exists as the result
of an error where both switch endpoints (for the same T1-span) are
administered as the primary. This causes the clock frequency to vary
widely and result in bringing down the switch. Loop-timing problems
can be avoided by following a correctly engineered network
synchronization diagram.½
½
½
½
½
½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4