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DATA TERMINAL
RS-232C
EQUIPMENT,
HOST COMPUTER
Z3A1/2/4
TN726
DATA LINE CP
ADU
SINGLE-LINE
VOICE TERMINAL
(2500-TYPE OR
7101A)
DATA TERMINAL
RS-232C
EQUIPMENT,
HOST COMPUTER
Z3A5
TN726
DATA LINE CP
ADU
MULTILINE
VOICE TERMINAL
(7300H-TYPE)
CO, FX, WATS
—————
PAGING
EQUIPMENT
DID TRUNKS
TN753
DID
TRUNK CP
TN760B
TIE TRUNKS
LEGEND :
ADU – ASYNCHRONOUS DATA UNIT
CAS – CALL ACCOUNTING SYSTEM
CO – CENTRAL OFFICE
CP – CIRCUIT PACK
DID -
DIRECT INWARD DIALING
DTU
– DIGITAL TAPE UNIT
FX – FOREIGN EXCHANGE
PART OF DIGITAL SWITCH
TN742
ANALOG LINE
CP OR
ZTN78 TIP
RING LINE CP
ZTN79
ATL LINE CP
ZTN76
GROUND START
TRUNK CP
OR
ZTN77
LOOP START
TRUNK CP
TIME
DIVISION
MULTIPLEX
BUS
TIE
TRUNK CP
MET – MULTIBUTTON ELECTRONIC TELEPHONE
OPS
- OFF-PREMISES STATION
SAT
– SYSTEM ADMINISTRATION TERMINAL
SMDR
– STATION MESSAGE DETAIL RECORDING
WATS -
WIDE AREA TELECOMMUNICATIONS SERVICE
Figure 3-6. Equipment Connected to System 25 Via the Call Processor And Port
Circuit Packs (Sheet 3 of 3)
3-13