Installing FOM-E1/T1 1
Quick Start Guide Installation of FOM-E1/T1 should be carried out only by an experienced
technician. If you are familiar with FOM-E1/T1, use this quick start guide to set it
up for operation.
This guide describes the standalone version of the modem.
Perform the installation procedures for both the local and the remote units.
1. Installing FOM-E1/T1
Configuring FOM-E1/T1
1. Open the modem’s case.
2. Select the E1/T1 electrical interface (JP2, JP4, JP5, JP6, JP7 and JP8).
3. If using E1 unbalanced interface, connect the BNC shield to the chassis ground.
If you are using balanced E1/T1, leave the shield floating (SW1 and SW2).
4. Close the modem’s case.
Table below provides details on the functions of the internal jumpers and switches,
and their default settings.
Jumper/Switch Function Possible Settings Factory
Setting
SW3, AIS When a major alarm is
detected, AIS is transmitted
to either the electrical or
optical interface.
ON – Transmit AIS
OFF – Do not transmit AIS
ON
SW2, INPUT Ground
SW1, OUTPUT Ground
Controls connection of the
BNC shield to the chassis
ground
CONNECTED – BNC shield is connected
to the chassis ground
(for E1 unbalanced)
FLOATING – BNC shield is disconnected
from the chassis ground
(for E1/T1 balanced)
FLOATING
JP2, JP4, JP5, JP6, JP7, JP8,
INTERFACE
Selects the E1/T1 electrical
interface
100 ohm BAL T1 – T1 100Ω balanced
(DB-15 connector)
120 ohm BAL CEPT – E1 120Ω balanced
(DB-15 connector)
75 ohm UNBAL CEPT – E1 75Ω
unbalanced
(BNC
connectors)
120 ohm
BAL CEPT
Note: For FOM-E1/T1 units with 115 VAC, factory setting is 100
Ω
BAL T1.