Installation manual

3
The rear panel of the Model 3910 modem (Figure 1) has the following switches and connectors:
• An ON/OFF power switch.
• An 8-pin DIN type power receptacle for the dc power supply.
• An 8-pin modular keyed jack for 4-wire/2-wire leased lines.
• An 8-pin modular keyed jack for dial (PSTN) lines.
• A 4-pin modular jack for the Network Management System (NMS) connection.
• A 25-pin DB-25-S receptacle for the DTE interface.
Connecting Model 3910 Modems with Supplied Cables
Figure 1 shows how Model 3910 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
OPERATION
POWER
SUPPLY
NOTE: DTE 2, 3, AND 4 ARE
FOR FUTURE OPTIONS
DTE 2 DTE 3 DTE 4
DTE 1LEASED DIAL NMS PWR ON OFF
Figure 1. Model 3910 Rear Panel and Power Supply