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COMSPHERE 3900 Series Modems
2-4 November 1996 3910-A2-GN32-30
DTE Connection
Use the following procedures to connect the EIA-232-D cable from the modem to the 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
labeled DTE (Figure 2-1) 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.
Model 3910 4-Wire/2-Wire Leased-Line Connection
Use the following procedures to connect a Model 3910 to the leased-line network interface:
1. Insert the 8-position, 8-conductor modular plug into the jack labeled LEASED
(Figure 2-1).
2. Insert the other end of the modular cord into the leased-line network interface.
Dial Network Connection
The telephone company provides the line termination jacks for the permissive service you request.
Advance coordination with the telephone company is suggested when connecting the modem to
telephone dial lines (PSTN).
In the Permissive mode, the modem’s transmit output level is fixed at –9 dBm. The telephone
company assumes that the line loss is 3 dB and no compensation is provided for additional losses.
A Permissive mode telephone line is usually terminated with a USOC RJ1
1C jack.
Model 3910 Dial Backup Connection
For the Model 3910, use the following procedures to connect the modem to the dial backup
network interface:
1. Insert the 6-position, 4-conductor modular plug into the jack labeled DIAL (Figure 2-1).
2. Insert the other end of the modular cord into the dial network interface.
Model 3910 Leased Backup Connection
For the Model 3910, use the following procedures to connect the modem to the 2-wire leased
backup network interface:
1. Insert the 8-position, 8 conductor modular plug into the jack labeled DIAL (Figure 2-1).
2. Insert the other end of the modular cord into the leased-line network interface.