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

							ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V2 & R1V37-113
SYSTEM 75 (R1V2 AND R1V3)
System 75 has the same facility considerations (framing, signaling, line coding format, etc.) as System 85
or Generic 2 and many similar equipment considerations (both require an additional clock circuit pack
for synchronization). The main differences are in terms of administration methods (screens for
System 75 versus procedures for System 85), and for some fields a difference in terminology. The
primary equipment differences are:
l     No synchronization cables are required.
l     Line compensation is translated in software rather than set by DIP switches.
All screens shown have their fields depicting default or recommended options.
Service/Facility Options
The 
DS1 CIRCUIT PACK screen is used to define characteristics of a DS1 facility.
NOTE: This screen requires that the circuit pack (TN722/TN722B) have been previously assigned½
½
½
to an equipment location (carrier and slot) by the CIRCUIT PACK ADMINISTRATION screen.
Figure 7-56, DS1 Circuit Pack Screen, depicts this procedure.½
DS1 CIRCUIT PACK
Page 1 of 1½
Location:
Line Compensation:
Framing Mode:
DMI-BOS?1
esf
yName:Zero Code Suppresion: zcs
Signaling Mode: common-chan
MAINTENANCE PARAMETERS
Slip Detection? n
Remote Loop-Around Test? 
n
Figure 7-56. DS1 Circuit Pack Screen
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-114ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V2 & R1V3
LocationA display-only field specifying the carrier and slot of a DS1.
NameThe name as shown on the network diagram.
LineRefers to the distance between the switch and the NCTE, CDM, CEM, DSX-1 cross-
Compensationconnect, T1 office repeater, or other equipment. The compensation setting is for the
total distance between the switch and the endpoint. Table 7-13, Line Compensation
Settings, shows compensation values for various distances.
TABLE 7-13. Line Compensation Settings½
½
Compensation ValueDistance (Feet)
1
2
3
4
5000 to 133
133 to 266
266 to 399
399 to 533
533 to 655
NOTE: Compensation values assume 22-gauge ABAM or 24-gauge PDS cables.
Two colocated switches can be up to 1310 feet apart with compensation on both
systems set to the maximum values. If 26-gauge PDS cables are used, distances
are reduced as shown in table 3-7, System 85 Traditional Module Equalizer
Settings (Metallic Cable).
The T1 office repeaters or T1 line repeaters can be used when the on-premises distance
limitation is exceeded. A T1 office repeater is required at each end of the connection
to provide an interconnection range of up to 3000 feet. Each repeater only provides
regeneration for the receive direction. The T1 line repeaters can be used to
accommodate distances up to 6000 feet between switches. The T1 line repeaters can
be used in tandem to accommodate greater distances.
Zero Code
Assigns the line coding format (ZCS or B8ZS) that will be used to forcibly ensure that
Suppression
the data meets T1-carrier ones-density requirements. The same considerations
regarding the choice of data rates, communications protocol, and facility requirements
that were discussed under System 85 procedure 260, field 9, apply here.
The choices are D4 or ESF (previously called F ). The network diagram should
show the choice for the particular DS1/T1-span. The other end and all intermediate
e
equipment should be optioned accordingly.½
½
Framing
Mode½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V2 & R1V37-115
SignalingThe default option is common-channel. This option is the same as 24th-channel or
ModeAVD for System 85. The alternate choice is robbed-bit. The choice of signaling mode
used is dependent on the application.
Common-channel signaling multiplexes all signaling information for channels 1-23 into
the 24th-channel. This makes available the full 64K-bps bandwidth (of channels 1-23)
for voice and/or digital data transmission. This capability is sometimes called½
½
Alternate Voice Data (AVD).
The term AVD is a software attribute for a trunk. AVD allows pure 64K-bps digital
data to be transmitted over those DS1 trunks that use 24th-channel signaling.
Although AVD trunks are designed for digital data transmission they may also be used
for voice and voice-grade data transmission. However, a pooled modem is required to
transmit voice-grade data over AVD trunks.
Due to a change in the evolving DS1/DMI protocol specification, two
CAUTIONmethods for providing 24th-channel signaling exist. The two methods
are not compatible with each other. The earlier method is known as the
AT&T proprietary format (conventional T1 test equipment cannot
analyze it). This latter version is known as the DMI-BOS format (T1
test equipment can analyze this format).
Either the AT&T proprietary format or the DMI-BOS format, depending on the circuit½
½
½
½
½
½
½
½
pack configuration, may be used with another System 75 or System 85. The DMI-BOS
format is required to provide 24th-channel signaling capability with other vendors
digital switches. Common-channel signaling (both methods) are not compatible with
channel banks and multiplexers.½
The TN722 circuit pack provides the AT&T proprietary format; the
circuit pack does not provide DMI-BOS. The TN722B circuit pack may
be administered to provide either the proprietary format or DMI-BOS
format.½
½
½
½
DMI-BOS
Assigns the DS1s format. Field encodes and their descriptions are:
n AT&T proprietary. This option assumes that common-channel signaling is
selected; otherwise, RBS is used.
y DMI. This option is equivalent to a 1 in field 14 of procedure 260.
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-116ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V2 & R1V3
Maintenance Options or Parameters
SlipThis option enables (y) or disables (n) switching between the primary, secondary, and
Detectioninternal high-accuracy clock. The decision to switch from one source to the other is
based on an internal slip count calculation.½
NOTE: Those DS1/T1 facilities that are used to provide the primary and
secondary synchronization reference should be administered for slip detection y.
Typically, those other DS1/T1 spans that are used for data applications and
deemed important should also be administered for slip detection. All T1-spans
connecting channel banks are excluded, unless the channel bank is externally
timed. Normally, DS1/T1 spans that are used exclusively for voice and which are
not assigned as the primary or secondary synchronization source should be
administered for slip detection n. Refer to the network synchronization diagram
to determine which option to choose.
The digital switch maintains a slip count record for each DS1. The slip count is used
to determine if the T1-span is experiencing errors and, if so, the severity of the errors
(type alarm). Option y enables switching between the primary, secondary, or internal
high-accuracy clock. If as many as 50% of those spans that are administered for slip
detection are experiencing slips (with respect to the primary), then a decision is made
to switch to the secondary.
Option y is equivalent to a 1 in field 10 of procedure 260.
Remote
Option y is only used during some phases of DS1/DMI diagnostic testing. The
Loopnormal or operational choice is n. Option n is equivalent to a 0 in field 11 of
Around
procedure 260.
Network Synchronization Options
The 
SYNCHRONIZATION PLAN screen is used to specify which of the two DS1/T1-spans (that were previously
administered with slip detection y) is the primary reference source and which is the secondary reference
source. Figure 7-57, Synchronization Plan Screen, depicts this procedure.½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							SYNCHRONIZATION PLANPage 1 of 1½
SYNCHRONIZATION SOURCE (DS1 circuit pack location)
Primary:Secondary:
DS1 CIRCUIT PACKS
Location     Name          SlipLocation     Name           Slip
ADMINISTRATION OPT’IONS AND REQUIREMENTS — SYSTEM 75 R1V2 & R1V37-117
Figure 7-57. Synchronization Plan Screen
PrimaryThe 3-character location of the circuit pack that is the primary synchronization
reference.
NOTE: The primary will be one of those DS1 circuit packs that has previously
been administered with slip detection y. The Location, Name, and Slip (actually
slip detection) fields list the DS1 circuit packs administered on the 
DS1 CIRCUIT PACK
screen. The primary and secondary source must be selected from this list.
SecondaryThe 3-character location of the circuit pack that is the secondary synchronization
reference.
There is no requirement that a secondary source be provided. However, it is a good
practice.
The Command Line Feature set provides four executable commands for controlling and
monitoring synchronization. They are:
l     Disable
l     Enable
l     Status
l     Set
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-118ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V2 & R1V3
Network Facilities — ISDN-PRI Applications
This screen is, from the user perspective, display only. However, the Customer Support Service
Organization (CSSO) may administer (add) new services or features as required. In terms of½
comparison, this screen is somewhat equivalent to procedure 279, word 1. Figure 7-58, Network-
Facilities Screen, depicts this procedure.½
½
½
½
NETWORK-FACILITIES
Predefined Services/Features½
Facility
Facility
Name
TypeCoding
Name
TypeCoding½
outwats-bnd
operator
sub-operator
sdn
accunet18001
0
0
1
100001
00101
00110
00001
00110megacom-800
megacom
inwats
wats-max-bnd
ldsmultiquest
1
1
1
1
100010
00011
00100
00101
00111
101000
1
10000
Additional Services/Features½
Facility
Facility
Name
Type
Coding
Name
TypeCoding½
Figure 7-58. Network-Facilities Screen½
Up to 15 alphanumeric characters that uniquely identify (by name) the Service or
Feature. Name
Facility
The ISDN-PRI specification requires that each network capability be identified as
Type
either a feature (0), or service (1).
Facility
The ISDN-PRI specification further requires that each service or feature be identified as
Codinga:½
½
½
½
½
½
l
l½
½
½
½
l
l
Parameterized Service
Parameterized Feature
Binary Service
Binary Feature
Since two new user defined facility names and codes have been added to System 75 R1V5, a conflict
might occur when a R1V4 user translation with user defined services or features is upgraded to R1V5
translation. Table 7-14, R1V4 to R1V5 Translation Upgrade Strategy, describes a strategy to resolve
this conflict.½
½
½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V2 & R1V37-119
TABLE 7-14. R1V4 to R1V5 Translation Upgrade Strategy
R1V4 User Defined
Translation Upgrade
Facility
Facility
Code(1)StrategyNote
Name
i80001000Remove from user defined table
2
i800not 01000
Remove from user defined table3½
½
½
½
½
½
½
½
½
½
½
½
½
not (i800 or multiquest)01000
Preserve in user defined table4
not (i800 or multiquest)not 01000
Preserve in user defined table2
multiquest
10000Remove from user defined table2
multiquest
not 10000
Remove from user defined table5
not (i800 or multiquest)10000
Preserve in user defined table
6
not (i800 or multiquest)not 10000Preserve in user defined table
2
NOTES:
1.
2.
3.
4.
5.
6.The Facility Code includes Facility Type and Facility Coding.
No changes in the behavior on incoming and outgoing calls.
An incoming call with this user defined code point will no longer be recognized. For an outgoing call that used this code point, use the
101000 (i800) code point.
An outgoing call will behave the same. For an incoming call, it is treated like i800.½
½
½
½
½
An incoming call with this user defined code point is no longer recognized. For an outgoing call that used this code point, use the 110000
(multiquest) code point.
An outgoing call will behave the same. For an incoming call, it is treated like multiquest.
Trunk Group/Trunk Group Members
For System 75 R1V2 and R1V3, there are three applications for a DS1 (tie and DMI); refer to table 7-6,
Equipment Parameters and Permitted Translation Encodes.½
½
Tie Trunks½
The DS1 tie trunks are defined by using Page 1 of the TRUNK GROUP screen; this is the same as for analog
tie trunk groups. Trunk members are added to the 
GROUP MEMBER ASSIGNMENTS screen (pages 2 through 5).
This series of screens administers many of the same parameters as procedures 100 and 101 do for
System 85. Figure 7-59, Trunk Group Screen, Page 1 (Tie Trunk Group), depicts this procedure.½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-120ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V2 & R1V3
TRUNK GROUPPage 1 of 11
Group Number:Group Type: tieSMDR Reports? y
Group Name:OUTSIDE CALL
COR: 1TAC: 114
Direction: two-wayOutgoing Display? nData Restriction? n
MIS Measured? n
Dial Access? yBusy Threshold: 99Night Service:
Queue Length: 0Internal Alert? nIncoming Destination: _
Comm Type: voiceAuth Code? n
TRUNK PARAMETERS
Trunk Type (in/out):Incoming Rotary Timeout (sec): 5_
Outgoing Dial Type: toneIncoming Dial Type: tone
—
Digit Treatment:
Digits:Connected to Toll? nSTT Loss: normalDTT to DCO Loss: normal
Incoming Dial Tone? y
Bit Rate: 1200Synchronization: asyncDuplex: full
Answer Supervision Timeout? 10½
Figure 7-59. Trunk Group Screen, Page 1 (Tie Trunk Group)½
Most fields require no unusual entries for DS1 tie trunk applications. Only those that may require
special attention are mentioned.
Comm Type½
½
Trunk Type
(in/out)
The default is voice with avd and data being the alternate selections.
NOTE: Trunk groups that are administered avd require that the DS1 also be
administered for common-channel signaling (24th). Furthermore, if avd is
translated; then Bit Rate, Synchronization, and Duplex fields are displayed. These
three fields enable the trunk group to function with a modem pool. A Data
Originate code is required to start a modem pool call. The avd option is
equivalent to translating System 85 procedure 101, field 17, with a 1.
Establishes the physical type of incoming and outgoing trunks. For tie trunk
applications, field encodes and their descriptions are:
l     Auto
l     Immed-start
l     Wink-start
l     Delay-dial
Figure 7-60, Trunk Group Screen, Page 2 (Tie Trunk Group), depicts this procedure.½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V2 & R1V37-121
GROUP MEMBERASSIGNMENTSPage 2of 5½
PortNameModeTypeAnswer Delay
1:
2:
3:
4:
5:
6:
7:8:
9:
10:
11:
12:
13:
14:
15:
Figure 7-60. Trunk Group Screen, Page 2 (Tie Trunk Group)½
This field associates each trunk group member to a particular carrier (A-E), slot (01-
20), and circuit (01-24).
NOTE: System 75 does not have the same DS1 circuit pack slot restrictions as
System 85. However, trunk group member assignments should match the DS1
channel assignments (for example, trunk group member 1 on channel 1) and
maintain this procedure as long as possible.
This field does not apply to PRI. Port
Name
Mode
Type½
For DS1 tie trunk applications, the default and only permitted entry is e&m.
For DS1/DMI applications, the default is T1 stan (T1 standard). Normally, this
field is not administered. The default value is appropriate.
Allowable entries (in milliseconds) range from 20 to 5100 in intervals of 20. This
field should only be translated if delay-dial were optioned. Answer
Delay
DS1/DMI Trunks½
The DS1/DMI trunks are defined by using the TRUNK GROUP screen. This screen is somewhat equivalent
to System 85 procedure 260, field 14, encode 1. Figure 7-61, Trunk Group Screen, Page 1 (DMI),
depicts this procedure.½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4 
						

							7-122ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 75 R1V2 & R1V3
TRUNK GROUPPage 1 of 5
Group Number:Group Type: dmiSMDR Reports? y
Group Name:OUTSIDE CALL
COR: 1TAC:Direction: two-wayOutgoing Display? n
Dial Access? yBusy Threshold: 60Night Service:
Queue Length: 0Incoming Destination:
TRUNK PARAMETERS
Trunk Type (In/out):Incoming Rotary Timeout (sec): 5Outgoing Dial Type: toneIncoming Dial Type: toneDisconnect Timing (msec): 500Digit Treatment:Digits:ACA Assignment? nLong Holding Time (hours): 1
Short Holding Time (secs.): 10Short Holding Threshold: 15
Bit Rate: 1200Synchronization: asyncDuplex: full
Incoming Dial Tone? yMaintenance Test? y
Answer Supervision Timeout:Suppress # Outpulsing? y½
Figure 7-61. Trunk Group Screen, Page 1 (DMI)
This screen is similar to the one for administering tie trunks. The primary difference is related to data
capabilities (Bit Rate, Synchronization, and Duplex). (Bit rate and data rate mean the same for
System 75 applications.)
ISDN-PRI Trunks
The ISDN-PRI trunks are defined by using the 
TRUNK GROUP screen. An enhancement for R1V4 and
R1V5 is ISDN call-by-call service selection. that allows a group of ISDN B-Channels to be designated
to carry calls to a variety of switched nodal services (such as SDN, MEGACOM, MEGACOM 800)
and/or carry calls destined for different Interexchange Carriers (such as AT&T and GTE). Information
elements passed between the switch and the public switched network in the initial call setup message½
½
½
½
½
½
½
½
½
½
dynamically determine the feature and/or service to be provided by the network on a call-by-call basis.
The ability to carry calls to a variety of switched nodal services takes advantage of call-by-call service
selection. You must specify a cbc trunk type to connect with this offering. You can then define usage
allocations to apportion a minimum and maximum number of members to CBC trunk groups for
specific services and vary them based on the time-of-day and day-of-week. You can also define
incoming call handling treatments (ICHT) based on incoming service/feature and incoming called
number as:½
½
½
½
½
½
ADDENDUM 1 (December 1990) to 555-025-101, Issue 4