User`s guide

COMSPHERE 3800 Series Modems
2-4 September 1998 3810-A2-GB93-30
Model 3810 and Model 3820 DTE Connection
Use the following procedure to connect the modem to a DTE:
1. Make sure the modem’s rear panel power switch is Off.
2. Connect the DB-25 plug on the cable to the DB-25 socket labeled DTE on the modem’s
rear panel. Use a small screwdriver to fasten the cable to the modem.
3. Connect the other end of the cable to the DTE.
To ensure compliance with FCC Part 15 Regulations, a ferrite choke must be installed on the
EIA-232-D interface cable. See Figure 2-3.
1. Open the ferrite choke and place it around the DTE cable as close as possible to the
connector attached to the modem.
2. Close the two halves around the cable and snap the ferrite choke shut, pressing down on the
plastic latch to secure it.
3. Install a cable tie behind the ferrite choke to prevent it from sliding along the cable.
98-13144-01
Ferrite
Choke
DTE
Connector
Cable Tie
Figure 2-3. Model 3810 and Model 3820 Ferrite Choke Installation