Specifications

Appendix A Connection Data Installation and Operation Manual
A-2 Main Link Connection Data FCD-E1LC Ver. 1.0
Connection Cable for Balanced Interface
The cable used for connecting the FCD-E1LC main link to equipment with
balanced E1 interface should include only two twisted pairs, one for the transmit
path and the other for the receive path.
The cable end intended for connection to the FCD-E1LC must be terminated in an
RJ-45 plug. Make sure pin 7 in the RJ-45 plug is not connected: the main link port
will switch to the unbalanced interface if DC current can flow from pin 7 of the
FCD-E1LC E1/T1 MAIN connector to ground.
Connection Cable for Unbalanced Interface, CBL-RJ45/2BNC/E1/X
To connect the FCD-E1LC main link to equipment with unbalanced E1 interface, it
is necessary to convert the FCD-E1LC RJ-45 connector to the standard pair of BNC
female connectors used for unbalanced E1 interfaces.
For this purpose, RAD offers a 15-cm long adapter cable, CBL-RJ45/2BNC/E1/X,
which has one RJ-45 plug for connection to FCD-E1LC E1/T1 MAIN connector and
two BNC female connectors at the other end. Cable wiring is given in
Figure A-2 .
Connecting this cable to the FCD-E1LC E1/T1 MAIN connector will cause the
interface to switch to the unbalanced mode.
RJ-45
BNC
Femal
e
Receiv
e
(Green)
Transmit
(Red)
1
2
3
4
5
6
7
8
Transmit
(Red BNC)
Receive
(Green BNC)
RX Ring
RX Tip
NC
TX Ring
TX Tip
NC
Cable Sense
GND
.
.
.
.
.
.
Figure A-2. Main Link Unbalanced Interface Adapter Cable, CBL-RJ45/2BNC/E1/X, Wiring Diagram