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ASM-20
Installation & Operation Manual Appendix D. DTE Interface Connectors
13/4/99 16:40 General D-3
Table D-1 Interface Signal List (Female Connectors) Pins and Standard Signal Names (Cont.)
RS-232 V.35 EIA-530 X.21
Signal
Function
DB-25
Stand-
alone
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
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.