Specifications

Installation and Operation Manual Appendix A Connection Data
FCD-E1LC Ver. 1.0 Sublink Connection Data A-3
A.2 Sublink Connection Data
Connector Data
The sublink port is terminated in an eight-pin RJ-45 connector, designated E1/T1
SUB.
Table A-2 lists the pin assignment of the connector. See Figure A-1 for
identification of connector pins.
Table A-2. Sublink Connector, Pin Assignment
Pin Function
1 Transmit data input (ring)
2 Transmit data input (tip)
3 Not connected
4 Receive data output (ring)
5 Receive data output (tip)
6 Not connected
7 Sense pin for detecting the connection of the unbalanced interface adapter cable
8 Ground
Connection Cable for Balanced Interface
The cable used for connecting equipment with balanced E1 interface to the
FCD-E1LC sublink should include only two twisted pairs, one for the transmit path
and the other for the receive path. The cable can usually be wired point-to-point,
because the pins assigned to the receive and transmit pairs in the sublink
connector have been interchanged relative to the main link connector.
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 sublink port
will switch to the unbalanced interface if DC current can flow from pin 7 of the
FCD-E1LC E1/T1 SUB connector to ground.