Specifications

Appendix A Pinouts Installation and Operation Manual
A-2 V.24, V.35, X.21 and RS-530 DTE Interface Connectors ASMi-31 Ver. 3.0
Table A-1. DTE Interface Signal Assignments (Cont.)
RS-232 V.35 RS-530 X.21 Description Signal
Function
DB-25
Stand-
alone and
Card Cage
DB-25
Card
Cage
34-Pin
Standalone
Pin Circuit
DB-25
Stand-
alone and
Card Cage
DB-25
Card
Cage
DB-15
Standalone
Pin Circuit
(Function)
Request to
Send
4 4 C RTS 105 4
19
4
19
3
10
(Control)
A positive level to ASMi-31
when data transmission is
desired.
Clear to
Send
5 5 D CTS 106 5
13
A positive level from ASMi-
31 with delay, after receipt
of Request to Send, and
when
ASMi-31 is ready to
transmit.
Data Set
Ready
6 6 E DSR 107 6
22
A positive level from ASMi-
31 when power is on, and
ASMi-31 is (a) not in
DIGITAL LOOP mode, or (b)
has not received a REMOTE
LOOPBACK signal from the
remote unit.
Data
Terminal
Ready
20 20 H DTR 108 20
23
Not used
Carrier
Detect
8 8 F DCD 109 8
10
8
10
5
12
(Indication)
A positive level from ASMi-
31, 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
11
24
11
7
14
A serial data rate clock input
from the data source.
Positive clock translations
must correspond to data
transmissions.