Comtech EF Data UB-530 - Manual (Page 23)

Breakout Panel Revision 2
Connectors and Switches MN/UB530.IOM
2–11
2.2.4 Engineering Service Channel (J4)
The Engineering Service Channel (ESC) connection is a 25-pin D connector located at the
front of the breakout panel. Screw locks are provided for mechanical security of the mating
connector.
Signal Function Name Pin #
Ground GND 1, 7
Transmit data TXD–A 2
TXD–B 14
Transmit clock TXCLK 15
Receive data RXD–A 3
RXD–B 16
Request to send/ RTS/CTS 4, 5
Clear to send (see note)
Receive clock RXCLK 17
Terrestrial ESC DSR TERESESCDSR 6
Note: RTS/CTS lines are looped together at the connector.