ATT System 25 Reference Manual

TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
This section provides information on the technical characteristics and capacities of the
system. Some items covered here are discussed elsewhere in the manual but are repeated
here for ease of reference.
Technical specifications are provided for:
l
l
l
l
l
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lHardware and Software Parameters
Unit Loads
Cable Distance Limitations
Call Progress Tones
Indicator Lamp Signals
Port Specifications
Recommended Central Office Facilities (Trunks)
Analog...

TECHNICAL SPECIFICATIONS
Hardware and Software Parameters
The following is a listing of maximums for hardware and software parameters.
ITEMTOTAL
Attendant Consoles
Direct Trunk or Switched Loop
2
Direct Extension Selector2
Automatic Route Selection (ARS):
Patterns
8
Subpatterns Per Pattern2
Routes Per Subpattern3
Facility Restriction Levels4
Cabinets3
Circuit Packs:
Common Control and Service Circuit2
Circuit Pack Slots Per Cabinet12
Conference/Bridging Members5
Coverage
Individual Covered StationsNo...

TECHNICAL SPECIFICATIONS
Hardware and Software Parameters (Contd)
ITEM
TOTAL
Emergency Transfer Units (ETUs)4
Voice Terminals per ETU5
Modem Pool Circuit Packs per cabinet2
Conversion Resources per circuit pack2
Paging Zones (Auxiliary CP)3
Parked Calls (System)24
Per Voice Terminal1
Attendant Selector Console8
Pickup
Groups
16
Members per group16
Trunk Groups16
System Delay Announcements:
Direct Group Calling Delay Announcement
Directed Night Service Delay Announcement
Account Code Digits
SMDR or Call...

TECHNICAL SPECIFICATIONS
Hardware and Software Parameters (Contd)
ITEMTOTAL
System Administration Terminal1
Toll Call Allowed Lists4
Total Entries (all lists) 3 digits
164
Virtual Facilities10
Traffic Data
l Simultaneous 2-Party Conversations115
l Call Capacity
— CCS/Hour4140
— Busy Hour Call Capacity
2500
Reliability
l Mean Time Between Outages (MTBO)
4 Years
Power Consumption
l Per Cabinet, Maximum500 Watts
l Thermal Dissipation1700 BTU/Hour
Total Ports - also includes trunk and station ports256...

TECHNICAL SPECIFICATIONS
Hardware and Software Parameters (Contd)
ITEMTOTAL
Trunks
l Trunk Ports104
— Tie Trunks104
l Auxiliary Trunk Ports
— Paging Access3
— Dictation Access8
Station Ports240
l Data Ports104
l Voice Ports200
— Single-Line Voice Terminals200
— Multiline Voice Terminals144
Attendant Consoles2
Selector Consoles2
22- or 34-Button Sets (nonattendant)96
Non 22- or 34-Button Sets142
November 19955-5 

TECHNICAL SPECIFICATIONS
Unit Loads
A cabinet can supply no more than 80 unit loads of 48 volt power (a unit load is defined as 44 mA).
Unit loading is determined by the terminal connected to the port circuits. The following table lists
unit loads for various terminals.
UNIT LOADS (Note)
EQUIPMENTCIRCUIT
UNIT LOAD
PACK
PER PORT
2500 Voice TerminalsZTN780.5
7100 Voice Terminals
TN7421.0
MET Sets (10 Btn.)TN7351.0
MET Set (12 Btn.)TN735
2.0
5-Btn. (7302H01D)ZTN791.0
10-Btn. (7303H01D)1.0
34-Btn....

TECHNICAL SPECIFICATIONS
Cable Distance Limitations
This subsection provides allowable cabling distances for the following devices:
l Single-Line Voice Terminals (Figure 5-1)
l Multiline Voice Terminals (Figure 5-2)
l Data Terminals (RS-232) Connected to Asynchronous Data Units (ADUs)
(Figure 5-3).
Single-Line Voice Terminals
SUPPORTING24-GAUGE WIRE
CIRCUIT
(0.5106 mm)
PACK
FEET
METERS
ZTN78
2,000
610
TN742 (2500 Series)
17,500   7,320
TN742 (Model 7101A)
15,0004,500
IN BUILDING
SINGLE-LINE2000...

TECHNICAL SPECIFICATIONS
Multiline Voice Terminals
SUPPORTING24-GAUGE WIRE
CIRCUIT(0.5106 mm)
PACK
FEETMETERS
ZTN79
(7300H Series—
in-building2,000
610
and ATL Cordless(Note)
Telephone or
out-of-building,
no off-premises)
TN7351,000
305
(in-building
MET Sets only)
Note:Requires local power (PEC 62510) beyond 1,000 feet or whenever IROBS are
used.
IN-BUILDING
7300H SERIES
VOICE TERMINALS
2000 FEETZTN79
AND ATL CORDEDATL LINE CP
AND CORDLESS
TELEPHONES
2000 FEET
OUT-OF-BUILDING7300H SERIES341341ZTN79
VOICE...

TECHNICAL SPECIFICATIONS
Data Terminals (RS-232) Connected To Asynchronous Data Units
DATA RATE
24-GAUGE WIRE
(0.5106 mm)
FEETMETERS
300 bps40,000
12,200
1,200 bps20,000
6,096
2,000 bps12,000
3,657
4,800 bps7,000
2,133
9600 bps5,0001,524
19,200 bps2,000
610
DISTANCE
(SEE TABLE)
RS-232CZTN130
DEVICEADUADU
CALL
(ASYNCHRONOUS)PROCESSOR CP
OR
DISTANCE
(SEE TABLE)
RS-232CTN726
DEVICEADUDATA(ASYNCHRONOUS)LINE CP
Figure 5-3.Asynchronous Data Unit Allowable Cable Distances (In-Building Only)
5-9 

TECHNICAL SPECIFICATIONS
Call Progress Tones
The following call progress tones are generated by the system:
TONE
Busy
Call Waiting Notify
Confirmation
Dequeuing
Dial
Queuing
Recall Dial
Reorder
Ringback, Normal
Ringback, Special (Call
Waiting)
FREQUENCYPATTERN (In Milliseconds)
480 Hz + 620 Hz
500 on, 500 off; repeated
440 Hz
200 on; not repeated
350 Hz + 440 Hz100 on, 100 off, 100 on,
100 off, 100 on followed
by silence
350 Hz + 440 Hz100 on, 100 off, 100 on,
100 off, 100 on followed
by silence
350 Hz +...