Справочник Пользователя для RAD Data comm E1

 

Installing FOM-E1/T1 

1 

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.  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. 

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 

Ω