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COMSPHERE 3800Plus Modems
2-2 November 1996 3980-A2-GB30-20
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
and 3820
Plus
Modem
Customer-Supplied Equipment
The following customer-supplied equipment may be
required to complete a data communications system using
the 3810Plus or 3820Plus 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:
— RJ1
1C for dial permissive applications
—
JM8 for leased-line applications
•
A JM8 to RJ1
1 crossover cable for 2-wire
leased-line applications (3820
Plus only)
If you are installing a 3810Plus or 3820Plus modem,
continue reading the next section. If you are installing a
3811Plus modem, skip to 3811Plus Modem Installation,
later in this chapter.
3810
Plus
and 3820
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 or 3820Plus
modem has
the following switches and connectors (see Figures 2-2
and 2-3):
• An ON/Off power switch.
• An 8-pin DIN type power receptacle for the
table-top power supply.