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APPENDIX A: DTE Interface Signal Assignments
Table A-1 (continued). Interface Signal List (Female Connectors),
Pins, and Standard Signal Names
Signal Function
RS-530 DB25
Description
Pin
Circuit
Data Set Ready
6
CC(A)
A positive level from the Fiber Optic
22
CC(B)
Modem when the power is on, and the
Fiber Optic Modem is:
not in a DIGITAL LOOP mode;
has not received a REMOTE
LOOPBACK signal from the remote
unit.
Data Terminal
20
CD(A)
Ready
23
CD(B)
Carrier Detect
8
CF(A)
A positive level from the Fiber Optic
10
CF(B)
Modem, except when a loss of the
received signal is detected or when
Data Set Ready is negative.
External Transmit
24
DA(A)
A serial data rate clock input from the
Clock
11
DA(B)
data source. Positive clock transitions
must correspond to data transitions.
Transmit Clock
15
DB(A)
A transmit data rate clock for use by an
12
DB(B)
external data source. Positive clock
transitions correspond to data
transitions.
Receive Clock
17
DD(A)
A receive data rate clock output for use
9
DD(B)
by an external data sync. Positive clock
transitions correspond to data
transitions.
