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Important Safety Instructions
The following instructions are in addition to those
found on Page B of the 3800Plus User's Guide. Read all
safety information before installing your modem.
1. This product is intended to be used with a
three-wire grounding type plug – a plug which has
a grounding pin. This is a safety feature.
Equipment grounding is vital to ensure safe
operation. Do not defeat the purpose of the
grounding type plug by modifying the plug or
using an adapter.
Prior to installation, use an outlet tester or a
voltmeter to check the ac receptacle for the
presence of earth ground. If the receptacle is not
properly grounded, the installation must not
continue until a qualified electrician has corrected
the problem.
If a three-wire grounding type power source is not
available, consult a qualified electrician to
determine another method of grounding the
equipment.
2. A rare phenomenon can create a voltage potential
between the earth grounds of two or more
buildings. If products installed in separate
buildings are interconnected, the voltage
potential may cause a hazardous condition.
Consult a qualified electrical consultant to
determine whether or not this phenomenon exists
and, if necessary, implement corrective action
prior to interconnecting the products.
3810 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 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):
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 4-wire/2-wire
leased lines or external telephone set.
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.
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.
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