2
3820
Plus Modem Installation
Before installing your modem, make sure your
installation site is clean and well-ventilated. Allow space
around the modem for installing cables and telephone
cords, and make sure the modem is located within reach
of the ac power outlet. The distance between your modem
and the 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 the 3820Plus modem has the
following switches and connectors (see Figure 2):
•
An ON/Off power switch.
•
An 8-pin DIN type power receptacle for the
table-top power supply.
•
An 8-pin modular keyed jack for 2-wire leased
lines.
•
A 6-pin modular keyed jack for dial (PSTN) lines.
•
A 4-pin modular jack for network management
system (NMS) connection.
•
A 25-pin DB-25-S receptacle for DTE interface.
8-POSITION
PLUG FOR
LEASED-LINE
NETWORK
OPERATION
6-POSITION PLUG
FOR PERMISSIVE
DIAL NETWORK
OPERATION
DB-25-P
CONNECTOR
FOR DATA
TERMINAL
EQUIPMENT
OPERATION
SUB-MINIATURE,
4-CONDUCTOR
PLUG FOR
NETWORK
MANAGEMENT
SYSTEM
OPERATION
POWER
SUPPLY
DTE 1
LEASED DIAL
NMS
PWR
ON OFF
POWER
CORD
Figure 2. 3820
Plus (Model 3982-A1-401) Rear Panel
