Chapter 5 FOM-E1/T1/R Card Version
Installation and Operation Manual
5-6
Installing the FOM-E1/T1/R Card
FOM-E1/T1 Ver. 2.0
Table 5-1. FOM-E1/T1/R Internal Jumpers and Switches
Jumper/Switch Function Possible
Settings
(factory setting in bold)
SW4, 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
SW1, INPUT Ground
SW3, 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)
JP1, JP2, JP3, JP4, JP5, JP6
Selects the E1/T1 electrical
interface
100 ohm BAL T1 – T1 100
Ω
balanced
120 ohm BAL CEPT – E1 120
Ω
balanced
75 ohm UNBAL CEPT – E1 75
Ω
unbalanced
Installing FOM-E1/T1/R in the ASM-MN-214 Card Cage
To install FOM-E1/T1/R into ASM-MN-214:
1. Install the ASM-MN-214 card cage in the 19-inch rack.
2. Insert the FOM-E1/T1/R card into one of the ASM-MN-214 slots.
3. Push the card into the cage until it is fully inserted into the edge connector
inside the rack.
4. Tighten the screws on the front panel of the card.
Connecting the Interfaces
FOM-E1/T1/R uses the ports on the ASM-MN-214 rear panel terminal block for
E1/T1 connections. The 25-pin D-type female connector serves as an alarm relay
port.
Balanced E1/T1
The two Tx screws on the terminal block serve as the E1/T1 electrical signal
outputs of the modem. The Rx screws on the terminal block serve as the
electrical signal inputs to the modem.
Unbalanced E1
When operating FOM-E1/T1/R with an unbalanced E1 interface, use adapter
CIA/TB-BNC/214 to convert the terminal block connector into two coaxial BNC
connectors.