3
DTE Connection
Use the following procedure to connect the RS-232D
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 (male) connector on the
cable to the DB-25-S (female) connector labeled
DTE 1 (Figure 2) on the modem’s rear panel. Use
a small screwdriver to tighten 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 tighten the cable to the DTE.
Connecting 3820
Plus Modems
with Supplied Cables
Figure 2 shows how 3820Plus modems are connected
to certain TELCO jack types using the supplied cables.
For other TELCO connections, refer to Appendix D of the
COMSPHERE 3800Plus Modems User’s Guide.
3820
Plus Dial-Line Connection
Use the following procedure to connect the 3820Plus
modem to the dial network interface:
1. Insert the 6-position, 4-conductor modular plug
into the jack labeled DIAL (Figure 2).
2. Insert the other end of the modular cord into the
dial network interface (“demarc”).
3820
Plus 2-Wire Leased-Line Network
Connection
Use the following procedure to connect a 3820Plus
modem to the leased-line network interface:
1. Insert the 8-position, 8-conductor modular plug
into the jack labeled LEASED (Figure 2).
2. Insert the other end of the modular cord into the
leased-line network interface (“demarc”).
AC Power Supply Connection
WARNING
Power supplies from other
modems may fit into the DIN
jack, but connecting the
wrong power supply can
cause damage to the modem
or the power supply.
Use the following procedure to connect the modem to
an ac power outlet:
1. Make sure the modem’s power switch is in the Off
position.
2. Insert the power transformer’s 8-pin DIN male
connector into the modem’s rear panel power
receptacle (Figure 2).
3. Connect the power supply to a grounded ac power
outlet.
