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DIGITAL SWITCH
EMERGENCY
TRANSFER
-48V DC
UNIT
UNIT
SINGLE-LINE
ANALOG
VOICE
TERMINALS
MULTILINE
VOICE
HYBRID
TERMINALS
DIRECT TRUNK
ATTENDANT
CONSOLE OR
HYBRID
ASYNCHRONOUS
DATA
RS-232C
DATA
HOST COMPUTERS
SWITCHED LOOP
ATTENDANT
CONSOLE
TERMINALS
UNIT (ADU)
ATTENDANT
DIRECT
HYBRID
EXTENSION
SELECTOR
CONSOLE
STARLAN
NETWORK
WORKSTATIONS
STARLAN
NETWORK
PRINT & FILE
SERVICES
STARLAN
NETWORK
HOSTS
STARLAN
NETWORK
GATEWAY
COMMON
CONTROL
COMPLEX
SWITCHING
NETWORK
(PORTS)
SYSTEM ADMINISTRATION
TERMINAL
RS-232C
OR
ADVANCED ADMINISTRATION
PC TERMINAL
RS-232C
TAPE
BACKUP
RS-232C
SMDR
OUTPUT
DEVICE
TRUNK FACILITIES
ANALOG FACILITIES
l DID
l
FX, WATS (LOOP/GROUND START)
l TIE
l
CO (LOOP/GROUND START)
l
PAGING SYSTEMS
ANALOG
MODEM
RS-232C
.
MUSIC SOURCE
ANALOG
. EXTERNAL ALERTS
.
DELAY ANNOUNCEMENT
.
DICTATION EQUIPMENT
.
PAGING SYSTEMS
AUXILIARY TRUNKS
.
DICTATION EQUIPMENT
Figure 1-1. System 25 Block Diagram
1-3