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...

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...

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,...

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...

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...

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...

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...

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...

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...

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...