Specifications

<C#>
Introduction
<C#>-8 V.3229 / V.3229L
<Re
f
erence>
Installation
* Modem options may force these signals on or cause them to be ignored.
This function can be disabled or its logic sense reversed by hardware straps.
Table 2:
Pi
n
N
o.
EIA-
232D
CCI
TT
V.24
Signal Name Description
11 Signal Quality
Indicator
This circuit indicates probability of er-
rors 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 the DTE equipment. Negative
clock transitions correspond to data
transitions.
17 DD 115 Receive Clock A receive data rate clock output for
use by the DTE equipment. Negative
clock transitions correspond to data
transitions.
18 141 Local Loopback
(Loop 3) Control
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 al-
ways be active (high) in 2-wire private
line operation. Cycling DTR causes
retraining.*
21 140 Remote Digital
Loopback
A positive level causes a digital loop-
back test mode at the remote mo-
dem.
22 CE 125 Ring Indicator In dial line operation this circuit is
positive in response to an incoming
ring signal.*
23 CH 111 Data Rate Se-
lect
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. Negative clock transi-
tions correspond to data transitions.
25 142 Test Mode Indicates the modem is in a test mode