Chapter 5 FOM-E1/T1/R Card Version FOM-E1/T1 Installation and Operation Manual
5-6 Installing the FOM-E1/T1/R Card
Table 5-1. FOM-E1/T1/R Internal Jumpers and Switches
Jumper/Switch Function Possible Settings Factory
Setting
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
ON
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)
FLOATING
JP1, JP2, JP3, JP4, JP5, JP6 Selects th e E1/T1
electrical interface
100 ohm BAL T1 – T1 100Ω balanced
120 ohm BAL CEPT – E1 120Ω balanced
75 ohm UNBAL CEPT – E1 75Ω unbalanced
120 ohm
BAL CEPT
Installing FOM-E1/T1/R into 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 ASM-MN-214 rear panel terminal block ports for the E1/T1
connections. The 25-pin D-type female connector serves as an alarm relay port.
Balanced E1/T1
The two TX screws of the terminal block serve as the E1/T1 electrical signal outputs
of the modem. The RX screws serve of the terminal block as the electrical signal
inputs to the modem.
Unbalanced E1
When operating FOM-E1/T1/R with unbalanced E1 interface, use
CIA/TB-BNC/214 adapter, which converts the terminal block connector into two
coaxial BNC connectors.
Fiber Optic
The ST, SC or FC fiber optic connectors are located on the front panel of the
modem card.
Alarm Relay
The ASM-MN-214 DB-25 connector serves as an alarm relay port (see Appendix A
for the connector pinout).