Motorola V.3600 User Manual page 29

Table 2-1. Pin Signal Descriptions (Continued)
EIA- CCITT
Pin 232D V.24
--
11
15
DB
17 DD
18 --
20 CD
21 --
22 CE
CH
23
DA
24
25 --
* Modem options may force these signals on or cause them to be ignored.
** Refer to Appendix C, Hardware Options.
† This function can be disabled or its logic sense reversed by hardware straps.
Signal
Signal
Quality
Indicator
Transmit
114
Clock
(DCE)
115 Receive
Clock
141 Local
Loopback
108.2 Data
Terminal
Ready
140 Remote
Digital
Loopback
125 Ring Indi-
cator
111
Data Rate
Select
113
External
Transmit
Clock
142 Test Mode Indicates the modem is in a test mode.
V.3600
Description
This circuit indicates probability of
errors in the received data: a positive
level indicates poor signal quality
while a negative level indicates good
signal quality. †
A transmit data rate clock output for
use by an external data source: Positive
clock transitions correspond to data
transitions.
A receive data rate clock output for use
by an external data sink: Positive clock
transitions correspond to data
transitions.
A positive level causes the modem to
enter the local analog loopback test
mode.*
This circuit is positive when the DTE is
ready to originate or answer a call in
dial-up operation. DTR must always be
active (high) in 2-wire private line
operation. Cycling DTR causes
retraining.*
A positive level causes a digital
loopback test mode at the remote
modem.*
In direct dial operation this circuit is
positive in response to an incoming
ring signal.*
Supplies a data rate control input to
select primary or fallback data rate:
Negative voltage selects primary data
rate and positive voltage selects
fallback data rate.*
A serial data rate clock input from the
data source. Positive clock transitions
correspond to data transitions.
Installation
2-5