Справочник Пользователя для RAD Data comm E1

Chapter 5  FOM-E1/T1/R Card Version 

FOM-E1/T1 Installation and Operation Manual 

5-6 

Installing the FOM-E1/T1/R Card

 

 

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 the 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 

 

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. 

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. 

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. 

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. 

The ST, SC or FC fiber optic connectors are located on the front panel of the 
modem card.  

The ASM-MN-214 DB-25 connector serves as an alarm relay port (see 

for the connector pinout).