Installation manual

10
Connecting Model 3920 Plus Modems with Supplied Cables
Figure 3 shows how Model 3920Plus modems are connected to certain TELCO jack types using the appropriate
cables.
8-POSITION,
8-CONDUCTOR
PLUG FOR
LEASED-LINE
NETWORK
OPERATION
6-POSITION,
4-CONDUCTOR
PLUG FOR
PERMISSIVE
DIAL
NETWORK
OPERATION
DB-25-P
CONNECTOR
FOR DATA
TERMINAL
EQUIPMENT
OPERATION
SUB-MINIATURE,
4-CONDUCTOR
PLUG FOR
NETWORK
MANAGEMENT
SYSTEM
OPERATION
POWER
SUPPLY
DTE 2 DTE 3 DTE 4
DTE 1LEASED DIAL NMS PWR ON OFF
POWER
CORD
NOTE: THE DIAL JACK IS ALSO USED
FOR 2-WIRE LEASED BACKUP.
Figure 3. Model 3920 Plus Rear Panel and Power Supply
DTE Connection
Use the following procedures to connect an EIA-232-D cable from the modem to a DTE:
1. Make sure the modem’s rear panel power switch is OFF.
2. Connect the DB-25-P (plug) connector on the cable to the DB-25-S (socket) connector (Figure 3) on the
modem’s rear panel. Use a small screwdriver to secure the cable to the modem.
3. Connect the DB-25-P connector on the cable to the DB-25-S connector on the DTE. Use a small
screwdriver to secure the cable to the DTE.