Specifications

Appendix A Interface Connector Specifications ASMi-52 Installation and Operation Manual
A-2 DTE Interface Connectors
Table A-1. V.35, X.21 and RS-530 Connector Pinouts (Cont.)
V.35 RS-530 X.21 Description
34-Pin DB-25 DB-15
Signal
Function
Pin Circuit Pin Circuit Pin Circuit
(Function)
Data Set
Ready
E DSR 107 6
22
CC(A)
CC(B)
A positive level from
ASMi-52 when power is on, and
ASMi-52 is (a) not in DIGITAL
LOOP mode, or (b) has not
received a REMOTE
LOOPBACK signal from the
remote unit.
Data
Terminal
Ready
H DTR 108 20
23
CD(A)
CD(B)
Not used
Carrier
Detect
F DCD 109 8
10
CF(A)
CF(B)
5
12
I(A)
I(B)
(Indication)
A positive level from
ASMi-52, except when a loss of
the received signal is detected or
when Data Set Ready is
negative.
External
Transmit
Clock
U
W
SCTE(A) 113
SCTE(B) 113
24
11
DA(A)
DA(B)
7
14
(A)
(B)
A serial data rate clock input
from the data source. Positive
clock translations must
correspond to data
transmissions.
Transmit
Clock
Y
a
SCT(A) 114
SCT(B) 114
15
12
DB(A)
DB(B)
6
13
S(A)
S(B)
(Signal
Timing)
A transmit data rate clock for
use by an external data source.
Positive clock translations
correspond to data translations.
Receive
Clock
V
X
SCR(A)
115
SCR(B)
115
17
9
DD(A)
DD(B)
A receive data rate clock output
used by an external data sink.
Positive clock translations
correspond to data translations.
Local Analog
Loop
L and j 18 LL A control signal input, which,
when on, sets ASMi-52 into
Local Analog Loopback
(V.54 Loop 3).
Remote
Digital Loop
N and h 21 RL A control signal input which,
when on, commands
ASMi-52 to send a remote
Loopback command (V.54 Loop
2) to the remote ASMi-52.
Test
Indicator
n and k 25 TM A Control Signal output from
ASMi-52; positive during any
test mode.