Installation
V.3600
2-5
11
--
Signal
Quality
Indicator
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. †
15
DB
114
Transmit
Clock
(DCE)
A transmit data rate clock output for
use by an external data source: Positive
clock transitions correspond to data
transitions.
17
DD
115
Receive
Clock
A receive data rate clock output for use
by an external data sink: Positive clock
transitions correspond to data
transitions.
18
--
141
Local
Loopback
A positive level causes the modem to
enter the local analog loopback test
mode.*
20
CD
108.2
Data
Terminal
Ready
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.*
21
--
140
Remote
Digital
Loopback
A positive level causes a digital
loopback test mode at the remote
modem.*
22
CE
125
Ring Indi-
cator
In direct dial operation this circuit is
positive in response to an incoming
ring signal.*
23
CH
111
Data Rate
Select
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.*
24
DA
113
External
Transmit
Clock
A serial data rate clock input from the
data source. Positive clock transitions
correspond to data transitions.
25
--
142
Test Mode Indicates the modem is in a test mode.
Table 2-1. Pin Signal Descriptions (Continued)
Pin
EIA-
232D
CCITT
V.24
Signal
Description
* 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.
Summary of Contents for V.3600 Series
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