COMSPHERE 3800Plus Modems
2-2 October 1998 3980-A2-GB30-40
DIAGNOSTIC
CONTROL
LCD AND
STATUS
POWER
SUPPLY
496-14678-01
POWER
ON/OFF
LEASED
(3810
Plus
ONLY)
DIAL
(OR LEASED
FOR 3820
Plus
)
DTE 1
NMS POWER IN
Figure 2-1. 3810
Plus
Modem

Customer-Supplied Equipment

The following customer-supplied equipment may be
required to complete a data communications system using
the 3810Plus modem:
•A DTE with an available RS-232D serial port.
•A standard RS-232D cable with a male DB-25-S
connector at one end to attach to the modem.
•One of the following modular dial or leased
network interfaces:
— RJ11C for dial permissive applications
— JM8 for leased-line applications
3810
Plus
Modem Installation
Before installing your standalone modem, make sure
your installation site is clean and well-ventilated. Allow
space around the modem for installing cables and
telephone line cords, and make sure the modem is located
within reach of the ac power outlet. The distance between
your modem and DTE should be minimized if DTE data
rates exceed 19,200 bps. Also, low capacitance cables
may be necessary for speeds greater than 19,200 bps or
distances greater than 50 feet.
The rear panel of a 3810Plus modem has the following
switches and connectors (see Figure 2-2):
•An ON/Off power switch.
•A barrel-type power receptacle for a wall-mount
transformer, or an 8-pin DIN type power receptacle
for a table-top power supply.
•An 8-pin modular keyed jack for 4-wire/2-wire
leased lines.