User manual

ASM-20 Installation and Operation Manual Appendix D DTE Interface Connectors D-3
Table D-1. Interface Signal List (Female Connectors) Pinout and Standard Signal Names (Cont.)
RS-232 V.35 EIA-530 X.21
Signal Function DB-25
Standalone and Frame
DB-25 Frame
34-pin Standalone Pin Circuit
DB-25 Standalone and Frame Pin Circuit
DB-25 Frame
DB-15 Standalone Pin Circuit [Function]
Description
Carrier Detect 8 8 F DCD 109 8 CF(A)
10 CF(B)
8 10
5 I(A) 12 I(B) [INDICATION]
A positive level from the ASM-20, except when a loss of the received signal is detected, or when Data Set Ready is negative.
External Transmit Clock
24 19
16
U SCTE(A) 113 W SCTE(B) 113
24 DA(A) 11 DA(B)
24 11
7 (A) 14 (B)
A serial data rate clock input from the data source. Positive clock transitions must correspond to data transitions.
Transmit Clock 15 14
10
Y SCT(A) 114 A SCT(B) 114
15 DB(A) 12 DB(B)
15 12
6 S(A) 13 S(B) [SIGNAL TIMING]
A transmit data rate clock for use by an external data source. Positive clock transitions correspond to data transitions.
Receive Clock 17 22
23
X SCR(B) 115 V SCR(A) 115
17 DD(A) 9 DD(B)
A receive data clock output for use by
external data sink. Positive clock transitions correspond to data transitions.
Local Analog Loop 18 18 L and j 141 18 LL A control signal input; when on,
commands the ASM-20 into Local Analog Loopback (V.54 Loop 3). See Table 2-2.
Remote Loopback 21 21 N and h 140 21 RL A control signal input; when on,
commands the ASM-20 to send a remote Loopback command (V.54 Loop 2) to the remote ASM-20. See Table 2-2.
Test Indicator 25 25 n and k 142 25 TM A control signal output from the
ASM-20; positive during any test mode.