Black Box 3600 Manual De Usuario
Installation
Modem 3600
2-5
7
AB
102
Signal
Ground
Ground
Signal or common signal and dc
power ground. **
power ground. **
8
CF
109
Receive
d Line
Signal
Detector
d Line
Signal
Detector
A positive level from the modem
indicating the presence of a
received signal (carrier detect). *
indicating the presence of a
received signal (carrier detect). *
9
--
+12
Volts
Volts
+12 voltage reference
10
--
-12 Volts -12 voltage reference
11
--
Signal
Quality
Indicator
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. †
of errors in the received data: a
positive level indicates poor signal
quality while a negative level
indicates good signal quality. †
15
DB
114
Trans-
mit
Clock
(DCE)
mit
Clock
(DCE)
A transmit data rate clock output
for use by an external data source:
Positive clock transitions
correspond to data transitions.
for use by an external data source:
Positive clock transitions
correspond to data transitions.
17
DD
115
Receive
Clock
Clock
A receive data rate clock output
for use by an external data sink:
Positive clock transitions
correspond to data transitions.
for use by an external data sink:
Positive clock transitions
correspond to data transitions.
18
--
141
Local
Loop-
back
Loop-
back
A positive level causes the modem
to enter the local analog loopback
test mode.*
to enter the local analog loopback
test mode.*
Table 2-1. Pin Signal Descriptions (Continued)
Pin
EIA-
232D
232D
CCITT
V.24
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.