RAD Data comm Modular Access Device with Integrated Router Manuel D’Utilisation

FCD-IPM Installation and Operation Manual 

Chapter 1  Introduction 

 

Functional Description 

1-7 

The main and sublinks have two line interfaces: 
•  120Ω balanced line interface, terminated in an RJ-48C eight-pin (ISO 10173) 

connector 

•  75Ω unbalanced interface, terminated in two BNC coaxial connectors 
•  T1 versions have a 100Ω balanced interface. 

You can select the E1 interface to activate the LTU option. With the T1 version, 
you can choose to activate CSU or DSU. 
When a power failure occurs, the failsafe bypass of the sub E1/T1 link ensures the 
continuity of voice services between the main and the fix sublink. 

 

 

E1 traffic can also be transmitted using 2-wire SHDSL physical interface. The 

SHDSL link uses TC-PAM technology and complies with the requirements of the 
ITU-T G.991.2 standard. 

 lists typical FCD-IPM ranges over 2-wire  

24 AWG line. 

kbps km  miles 

192 

6.5 

4.0 

384 

5.8 

3.6 

512 

5.1 

3.1 

768 

4.8 

2.9 

1024 

4.1 2.5 

1152 

3.5 2.1 

2048 

3.2 1.9 

Each of the two IO data channels can be operated as n x 64k or n x 56k data port 
(DCE only). 

Internally, FCD-IPM uses one system timing source (clock). This system clock 
determines the transit timing of all the E1 links and data ports. The clock source 
options are as follows: 
•  Main link 1 
•  Sublink (each of them) 
•  Internal.