ATT System 25 Administration Manual

							Line Compensation
Use this action item to specify an amount of equalization compensation based on the length
of cable between the DS1 interface and the Channel Service Unit (CSU) or other far end
connection ports. Table 18-1 gives compensation settings for specific cable lengths.
NOTE: If the cable terminates on DS1 terminal equipment, such as a D4 channel bank,
another System 25, or a System 75, divide the cable length in half before referring to
Table 18-1. For example, if a cable terminates at another System 25 and is 250 feet long, you
would use the setting associated with a cable length of 125 feet, which is setting 1.
To specify line
1     At 
Menu =, enter 3.
compensation:
2     At 
Slot =, enter the CSS of the slot in which the DS1
board is installed.
3     At 
Action =, enter 3.
4     At 
Data =, enter a value from 1-5.
The default is 1.
TABLE 18-1 Line Compensation Settings *
CABLE LENGTH
EQ COMPENSATION
(feet)SETTING (Data =)
0-1331
133-2662
266-3993
399-5334
533-6555
*   For 22 AWG ABAM cable and 24 AWG PDS wire only.
Administering the T1 Carrier Interface (DS1) 18-3 
						

							Zero Code Suppression
Use this action item to select a zero code suppression mode. Zero code suppression is used
to detect and prevent the transmission of an all-zero byte. The mode selected must match
that employed at the far end. The choices are Bipolar 8 Zero Suppress (B8ZS) and Zero
Code Suppression (ZCS). B8ZS is preferred because it provides data transparency.
However, ZCS is compatible with most current T1 equipment and does not cause bipolar
violations.
NOTE: All intermediate devices must be compatible with B8ZS as well as the endpoints.
To select a zero code
1     At 
Menu =, enter 3.
suppression mode:
2     At 
Slot =, enter the CSS of the slot in which the DS1
board is installed.
3     At 
Action =, enter 4.
4     At 
Data =, enter 0 for ZCS or 1 for B8ZS.
The default is 0 (ZCS).
Framing Mode
Use this action item to select a T1 framing mode. The framing mode selected must match the
mode used at the far end. The choices are Extended Super Frame (ESF) and D4. D4 is more
commonly employed; however, ESF is preferred when possible, because it offers better
detection of framing and signaling errors.
To select a T1 framing
1     At 
Menu =, enter 3.
mode:
2     At 
Slot =, enter the CSS of the slot in which the DS1
board is installed.
3     At 
Action =, enter 5.
4     At 
Data =, enter 0 for D4 or 1 for ESF.
The default is 0 (D4).
Signaling Mode
Use this action item to select a T1 signaling mode. The signaling mode selected must match
the mode used at the far end. The choices are robbed bit signaling and common channel
signaling. Robbed bit signaling allows you to use all 24 channels; with common channel
signaling you cannot use channel 24.
NOTE: The signaling mode cannot be changed is action item 2 (for error reporting) is
enabled. Therefore, unless you plan on using the default signaling mode (robbed bit), you
must translate this action item before enabling the board.
18-4 Administering the T1 Carrier Interface (DS1) 
						

							To select a signaling
mode:1     At Menu =, enter 3.
2     At 
Slot =, enter the CSS of the slot in which the DS1
board is installed.
3     At 
Action =, enter 6.
4     At 
Data =, enter 0 for robbed bit signaling or 1 for
common channel signaling.
The default is 0 (robbed bit).
Red Alarm Activation Time
Use this action item to specify a time interval that, when exceeded by an alarm condition, will
activate a red alarm (RED) at the DS1 circuit pack. A red alarm indicates the loss of frame
synchronization at DS1 interface. A longer time interval can be employed to filter out the
reporting of transient alarm conditions.
To specify a red alarm
1     At 
Menu =, enter 3.
activation time:
2     At 
Slot =, enter the CSS of the slot in which the DS1
board is installed.
3     At 
Action =, enter 8.
4     At 
Data =, enter 0 for 3 seconds or 1 for 10 seconds.
The default is 0 (3 seconds).
Administering the T1 Carrier Interface (DS1) 18-5 
						

							Port Administration
There are 24 channels on a T1 carrier. Each channel is
assigned a portion (a time slot) within the carrier. These time
slots (or DS0s) are also used to identify the port or board
number. Each analog facility (i.e. LS, GS, DID, or TIE trunk
or OPS line) is assigned a port number which is the channel
number that corresponds to the port the facility uses,
This administration is done with action item 1 under the
PORT Menu (Main Menu = 1). See “Assigning A Trunk” in
Section 5, “Administering Trunks”. The only additional port
administration regarding the T1 interface is the “Special
Signaling” action item in the next section.
Special Signaling
Use this action item to specify how signaling states are encoded and decoded in the A & B
signaling bits. The choices are Foreign Exchange and Special Access Unit. Select Foreign
Exchange when the port terminates on a Foreign Exchange Unit in a D4 channel bank. Select
Special Access Unit when the port terminates on a Special Access Unit in a D4 channel bank.
NOTE: This action item applies to the following trunk types only:
n     ground start CO trunks
n     loop start CO trunks
n     OPS (off-premises station) line interfaces
To specify special1     At 
Menu =, enter 1.
signaling:
2     At 
Port =, enter the carrier/slot/port (CSSPP) of the port
(channel) you want to translate.
3     At 
Action =, enter 30.
4     At 
Data =, enter 0 for Foreign Exchange or 1 for
Special Access Unit.
The default is 0 (Foreign Exchange).
18-6 Administering the T1 Carrier Interface (DS1) 
						

							Timing Administration
The action items in this section are used to administer the T1
timing options. All the items in this section are organized under
the SYSTEM Menu (Main Menu item 4).
Primary Synchronization Source
Use this action item to specify a primary synchronization (timing) source. If the System 25 is part
of a larger T1 network, it must be synchronized with the network’s common timing source. The
System 25 synchronizes itself to the network by extracting the timing signal from the incoming
digital stream. Use this action item to specify the slot in the System 25 carrier that will receive the
timing signal from the network.
If your network is such that you want the System 25 to provide the local timing signal, then use
the default parameter of this action item.
To specify a primary1     At 
Menu =, enter 4.
synchronization source:
2     At 
Action =, enter 140.
4     At 
Data =, enter the CSS of the slot administered as a DS1
circuit pack.
If this action item is not translated, the system defaults to
local timing as the primary source.
NOTE: To change the timing source, Action = 142 and Data = 1 have
to be set.
Enable Automatic Synchronization Source Switching
Use this action item to enable or disable automatic synchronization source switching.
Timing can be provided in two ways: locally, by the System 25 itself; or from an outside source,
received through a designated System 25 slot (as specified by the Primary Synchronization Source
action item). Enabling automatic source switching will cause the System 25 to switch from the
currently specified primary timing source to the local reference source if the primary source
should become impaired.
To enable automatic1     At 
Menu =, enter 4.
synchronization source
switching:2     At 
Action =, enter 142.
4     At 
Data =, enter 0 to disable or 1 to enable automatic
source switching.
The default is 1 (enable).
November 1995Administering the T1 Carrier Interface (DS1)/HI D CKT 18-7 
						

							Index
A
Access Code, speed dialing, 4-13
Access TCA list, 4-9
Account Code, attendant, 9-8
Account Code Entry Feature, 10-6
Account Code Entry Type, assign, 7-6
Account Codes, 4-6
Action, 2-4
Action Groups, 2-7
Action Number, changing, 2-5
Add a Code to TCA List, 4-10
Add a Data Terminal, 7-1, 8-1
Add a Voice Terminal, 7-1
Add an FPDC, 4-11
Add Member to DGC Group, 11-2
Adding a Data Station, 8-1
Additional Tone Detector, 6-5
Administering Auxiliary Equipment, 6-1
Administration, 2-3
Administration Commands, 2-4
Administration Password, 4-9
Administration Port Requirements, 17-2
Alarm, system, search, 14-9
Alert, external, 2-10, 6-1, 14-7
All-Zone Access Code, 6-2
Area Code Routing Table, 12-6
Area Code, assigning, 12-9
Area Code, search, 14-7
ARS, 2-8
ARS, international dialing, 12-1
ARS Digit Translation Tables, 12-9
ARS Facility Restriction Level, 7-6, 7-12, 9-8
ARS Facility Restriction Level, data stations, 8-6
ARS Facility Restriction Level, system default, 4-16
ARS Patterns, 12-2
ASCII Display, 17-1
Assign a DGC Group Access Code, 11-1
Assign Area Code, 12-9
Assign Pattern Number, 12-2, 12-4, 12-8
Assign Routing Pattern, 12-6
Assign RS-232 Connector Function, 15-1
Assigning a SLAC, 9-2
Assigning a Trunk, 5-1
ATL Port, 9-1
Attendant Assignments, default, 9-1
Attendant Call Parking, 9-13
Attendant Console, class of service, 9-7
Attendant Console, move, 9-3
Attendant Console Options, SLAC, 9-14
Attendant Coverage, POS BUSY mode, 9-15
Attendant Display ID, 9-6
Attendant Equipment, administration, 9-1
Attendant Message Waiting Button, 10-14
Attendant Options, 3-5, 9-12Attendant PDC, change, 9-3
Attendant Position Number, 9-3
Attendant Specification, trunks, 5-9
Attendant Specifications, 9-16
Attendant Console, first, 9-1Attendant Console Buttons, 10-13
AUTO ANS Button, 10-7
Auto-adjust Baud Rate, 8-7
Auto-Intercom, search, 14-2
Automatic Hold, 9-14
Automatic Intercom Feature, 10-7
Automatic Route Selection, 3-5, see also ARSAutomatic Route Selection, administration, 12-1
Auxiliary Equipment, 6-1
Auxiliary Equipment Option, 3-4
BBackspace Key, 2-2, 17-1
Barrier Codes Administration, 4-17
Barrier Codes, enable, 4-15
Baud Rate, 8-8, 17-2
Baud Rate, change, 15-2
Baud Rate, mismatch, 8-9
Baud Rate and Parity, 8-7
Board Locations, search, 14-4
Board Locations (translated), search, 14-6Bridged Access Button, 10-7Bridging, multiline, 7-14
Button Assignment Tables, 10-4, 10-5
Button Assignments, administration, 10-1
Button Assignments, default, 10-1
Buttons
Attendant Console, 10-6
Auto Ans, 10-7
Call, 10-8
Cover Group Receiver, 10-8
Data, 10-9
Directory, 10-9
Feature, 10-1
Group Select, 9-5
Inspect, 10-10
Leave Word Calling, 10-10
Local, 10-10
Message Waiting, 10-14
Multiline, 10-6
Next, 10-11
Night Service, 10-14
Position Busy, 10-14
Scroll, 10-12
Selector Console, 9-6, 10-2
Send All Calls, 10-12
Station, 2-10
System Access, 10-13
Index I-1 
						

							C
Call Accounting Options, 4-6
Call Button, 10-8
Call Coverage, group, 9-9
Call Forwarding/Following, 4-3
Call Identification Messages, 7-3
Call Parking, attendant, 9-13
Call Progress Text Messages, 8-10
Call Waiting, multiline, 7-15
Call Waiting, single-line, 7-9
Callback Queuing, attendant, 9-10
Callback Queuing, multiline, 7-14
Callback Queuing Options, 4-14
Callback Queuing, single-line, 7-8
Callback Queuing, trunks, 5-8
Calling Restrictions, 7-5
Call-type Attendant Specification, 9-18
Call-type Defaults, message-center-like, 9-16
Call-type Defaults, standard, 9-16
Call-type Options, 9-15
Call-type Options, setting, 9-17
Call-type Priorities, 9-15
Call-type Priority, set, 9-17
Camped-on Calls, 9-13
Central Office Code, 12-7
Changing a Data Value, 2-5
Changing a Station Dial Code, 7-4, 8-3Changing a Target Value, 2-6
Changing an Action Number, 2-5
Changing an Attendant PDC, 9-3
Circuit Packs, listing, 14-12
Class of Restriction (COR), system default, 4-16
Class of Service, attendant console, 9-7
Class of Service, DID trunk, 5-4
Class of Service, non-DID trunks, 5-4
Class-of-Service Options, 5-6, 7-5
Class-of-Service Options, data stations, 8-4
Class-of-Service Options, STARLAN CP, 8-4
Cold Start, 3-1, 3-3
Cold Start, full-default, 3-1
Cold Start, limited-default, 3-1, 3-2
Command Format, 2-4
Command Mode, 8-9
Commands, 2-4
Commands, entering, 2-5
Connection Indication Message, 8-10
Conventions, 1-2
Copy Switch, local, 17-2
Correcting Typing Errors, 2-2
Coverage, attendant POS BUSY, 9-15
Coverage, group, 7-7, 7-13, 9-9
Coverage Group Receiver Button, 10-8
Coverage Message Waiting Feature, 10-9
Coverage Options, 4-3
Coverage-Individual Feature, 10-8
D
Data, 2-4
Data Button, 10-9
Data Button, search, 14-2
Data Dial Code, change, 8-3
Data Line and STARLAN CP Ports, administration,
8-1Data Port, 2-6
Data Rate, low, 8-7Data Stations, 3-5 see 
also Data Terminals
Data Stations, add, 8-1,
Data Stations, administration, 8-1Data Stations, move, 8-4
Data Stations, remove, 8-2
Data Terminals, add, 7-1, 8-1
Data Terminals, class of service, 8-4
Data Value, changing, 2-5
Date, format, 4-5
Date, set, 4-5
DDC Display ID, 8-2
Default Attendant Assignments, 9-1
Default Button Assignments, 10-1
Default Button Assignments, DTAC, 10-1
Default Button Assignments, SLAC, 10-1
Default Translations, 3-1
Delay Announcement, DGC, 6-3
Delete a Code from TCA List, 4-10
Delete an FPDC, 4-11
DGC, 2-8, 3-5, 5-6, 11-1
DGC, add member, 11-12
DGC, administration, 11-1
DGC, assigning access code, 11-1
DGC, delete member, 11-2
DGC, display ID, 11-3
DGC, search, 14-3DGC Delay Announcement, 6-3
Dial Access, 5-6
Dial Access Restriction, 7-5, 7-11, 9-7
Dial Code, 3-2
Dial Code, changing, 7-4, 8-3
Dial Code, full-default assignments, 3-1
Dial Code, system, 3-2
Dial Plan, 3-1
Dial Tone, incoming tie trunks, 4-7
Dialed Characters Displayed, 8-10
Dialing, international, ARS, 12-1
Dialing, keyboard, 8-9
Dictation, 6-5
DID Calls, 9-12
DID Digits, 4-8
DID Numbers, display ID, 4-8
DID Trunk, display ID, 4-8
DID Trunk, 5-4
Digital Tape Unit, 13-1
Digital Tape Unit, operation, 13-2
Digits, prefixed, 12-10
Direct Extension Selector, 9-4
Direct Facility Access Feature, 10-10
Direct Group Calling, see DGCDirect Station Selection Feature, 10-10
Direct Trunk Attendant Console, 
see DTAC
Directed Night Service, 5-6
Directed Night Service Delay Announcement, 6-3
Directory Button, 10-9
Disconnect Code, 8-10
Disconnect, on loss of carrier, 4-4
Disconnect, on received space, 4-5
Disconnecting, 2-2
Display ID, attendant, 9-6
Display ID, DDC, 8-2
Display ID, DGC access code, 11-3
Display ID, DID trunks, 4-8
Display ID, FPDC, 4-11
Display ID, PDC, 9-6
I-2 Index 
						

							Display ID, unassigned DID numbers, 4-8
Display ID, VMS, 6-5
Display IDs, 2-8
Display IDs, trunks, 5-3
Display Support Feature, 2-8
Display Support Searches, 14-10
DTAC, 9-1
DTAC Button Defaults Table (administration), 10-4
DTAC Button Defaults Table (cold start), 10-4
DTAC Default Button Assignments, 10-1
Duplex Operation, 17-1
E
Emergency Telephone Numbers, ARS, 12-1
End-to-end Signaling, 4-12
Entering Commands, 2-5
Entering Your Password, 2-1
Error Messages, 2-11
Errors, correcting, 2-2Errors, search, 14-10
Escape Key, 2-2
Exception List, home area code, 12-7
Exception List, other area codes, 12-8
Exclusion Feature, 10-9
Expert Mode Prompt, 4-9
Extended/Off-Premises Station, 7-7
External Alert, 2-10
External Alert, search, 14-7External Alerts, 6-1
F
Facility Code Number, 12-9
Facility Restriction Level, 12-3, 12-5
Feature, buttons, 10-1
Features, 2-3First Attendant Console, 9-1
Floating Personal Dial Code, see FPDC
Format of Date, 4-5
Following/Forwarding, 4-3Forwarding, attendant, 9-10
Forwarding, multiline, 7-14
Forwarding, single-line, 7-8
Forwarding/Following, 4-3
FPDC, 2-8, 3-4, 4-11FPDC, add, 4-11
FPDC, delete, 4-11
FPDC, display ID, 4-11
FPDC, ring at attendant console, 9-13
FPDCs, list, 4-11
Full-default Cold Start, 3-1
Full-default Dial Code Assignments, 3-1
GGround Start Trunks, maintenance busy, 4-7
Group Call Coverage, 9-9
Group Coverage, 7-7, 7-13
Group Select Buttons, 9-5
H
Hanging Up, 2-2
Hold, 9-14
Hold Timer, set audible tone for, 9-14
Hold Timer Length, 9-14
Home Area Code Exception List, 12-7
How to Use the System, 2-1
Hunt Group, search, 14-3
Hunt When Busy, data station, 8-5
I
ID, display support, 2-8, 14-10
ID Messages, incoming calls, 7-3
Implementation Planning Forms, 1-1
Incoming Call Identification Messages, 7-3
Incoming Signaling, 5-7
Initialization Sequence, 3-3
Inspect Button, 10-10
International Dialing, ARS, 12-1
Intercom, 10-7
K
Keyboard Dialing, 8-9
Keys
Backspace, 2-2
Escape, 2-2
Return, 17-1
L
Last Number Dialed Feature, 10-10
Leading Digits, removal, 12-10
Leave Word Calling Button, 10-10
Leaving an Administration Session, 2-2
Limited-default Cold Start, 3-1, 3-2
Line Preference, 7-12, 9-9
List active FPDCs, 4-11
List Members of a TCA Group, 4-10
List Stations in DGC Group, 11-2
List, exceptions, 12-7, 12-8
Lists, 2-8
Local Button, 10-10
Local Copy Switch, 17-2
Logging In, 2-1
Loop Start Trunks, trunk-to-trunk transfer, 4-7
Low Data Rate, 8-7
M
Main Menu, 2-1, 2-3
Maintenance Busy of Ground Start Trunks, 4-7
Manual Signaling Feature, 10-12
Manual Signaling, search, 14-2
Message, call identification, 7-3
Message, call progress text, 8-10
Message Waiting Button, attendant, 10-14
Message Waiting Feature, 10-11
Message Waiting, search, 14-2
Message-center-like Defaults, 9-16
Message-center-like Operation, set, 9-17
MET Set Button Defaults Table, 10-5
MET Sets, default button assignments, 10-1
Mismatch of Baud Rate, 8-9
Modem Request Code, 4-4
Moving a Data Station, 8-4
Moving a Voice Station, 7-4
Moving Attendant Consoles, 9-3
Multiline and Attendant Consoles, buttons, 10-6
Index I-3 
						

							Multiline Voice Stations, class of service, 7-11Prerequisites, 1-1
Multiline Voice Terminal Button Default Table, 10-2Print Messages, 2-12
Music-on-Hold, 6-4Priorities, call-type, 9-15, 9-17
N
Next Button, 10-11
Night Service, 5-6, 7-10, 7-16, 9-11
Night Service, directed, 5-6, 6-3
Night Service, search, 14-4
Night Service Button, 10-14
Night Service Trunk, 2-8
Non-DID Trunk, 5-4
Number of DID Digits, 4-8
O
Off-Premises Station, 7-7On Line Switch, 17-2
One-button Transfer to Data Feature, 10-9Other Area Codes Exception List, 12-8
Outside Area Code Toll Calls, 4-2
Outward Calls, restriction of access to, 7-5, 7-11, 9-7
Outward Calls, restriction of access to, data stations,
8-5
P
Paging, auxiliary trunk port, 6-2
Paging, CO trunk port, 6-2Parameters, 2-3
Parity, 8-9
Parked Call, return to attendant, 4-7
Parking, attendant, 9-13
Password, 2-1, 4-9Password, administration, 4-9
Password, default, 2-1
Pattern Number, assigning, 12-2, 12-4, 12-8
PDC, 2-6, 7-1, 8-2
PDC, attendant change, 9-3
PDC, display ID, 7-3, 9-6
PDC, selector console buttons, 9-6
PDC Menu, 7-1, 8-1
Personal Dial Code, 7-1, 8-2
Personal Line Feature, 10-11
Personal Line, search, 14-3
Personal Speed Dialing, 7-8, 7-14, 9-10
Pickup, 7-8, 7-13, 9-10
Pickup Group, search, 14-4
Pins CF and CB as Common, 4-4
Planning Forms, 1-1
Pooled Modem, 6-5
Pooled Modem Options, 4-4
Pooled Trunk Hunting Order, 5-8
Port Board Cabinet Location, 14-12
Port Board Type, 14-12
Port Board Vintage, 14-12
Port Locations, search, 14-5
Port Locations (translated), search, 14-6
Port Menu, 7-1, 8-1
Port Requirements, 17-2Port Value, 2-6
Ports, removing, 2-10
POS BUSY Mode, attendant coverage, 9-15
Position Busy Button, 10-14
Preindication Feature, 10-9
QQueue, calls returning, 9-15
Quitting an Administration Session, 2-2
R
Recording Calls, 4-6
Related System Parameters, 2-7
Release and Version Information, 1-1
Remote Access, assign to trunks, 5-8
Remote Access Options, 4-15Remote Access, system default class of restriction, 4-16
Remove a Selector Console, 9-5
Remove an Attendant Console, 9-4
Remove Speed Dialing Number, 4-13
Removing a Station, 8-2
Removing a Trunk, 3-2, 5-3
Removing Ports, 2-10
Repertory Dialing Feature, 10-11
Respond to Remote Loop, 4-4
Restore and Save, on tape, 3-5
Restore System Translations, 13-5
Restriction of Access, 7-5
Restriction Level, facility, 12-3, 12-5
Restrictions, calling, 7-5
Restrictions, dial access, 7-5, 7-11, 9-7
Return Delay, change length, 15-2
Return Key, 17-1
RIMS Barrier Code, 4-15
Routing Patterns, 12-2, 12-6, 12-7
Routing Table, area code, 12-6
RS-232 Connector Functions, assigning, 15-1RS-232 Parameters, administration, 15-1
RS-232 Interface, 17-1
SSAT Display, 17-1
SAT Port Speed Setting, 17-2SAT Requirements, 17-1
SAT Switch Settings, 17-2
Save and Restore, on tape, 3-5
Save System Translations, 13-2
Save Translations, 13-1
Scroll Button, 10-12
Search, 14-1
Search, display support, 14-10
Search, group coverage sender stations, 14-2
Search, system, 14-1
Search Group, identification, 14-1
Search Menu Item, 2-9
Searching for System Information, 14-1
Second Attendant Console, 9-1, 9-2
Security, 2-1
Selecting a Main Menu Item, 2-4
Selector Console, 9-4, 9-5
Selector Console, assign, 9-4
Selector Console Button Defaults Table, 10-5
Selector Console Buttons, 9-5, 10-2
Selector Console Group Select Buttons, 9-5
Selector Consoles, first and second, 10-2
Send All Calls Button, 10-12
I-4 Index