Digital Interface Signal Descriptions - Motorola V.3400 User Manual

Table 2-1. Digital Interface Signal Descriptions
Pin EIA- CCITT
No. 232D V.24
1
2 BA
3 BB
4 CA
5 CB
6 CC
7 AB
8 CF
* Modem options may force these signals on or cause them to be ignored.
Signal
Name
101 Shield
103 Transmitted
Data
104 Received
Data
105 Request to
Send
106
Clear to
Send
107 Data Set
Ready
102 Signal
Ground or
Common
Return
109 Received
Line
Signal
Detector
Description
No connection
Serial digital data (to be modulated) from a
data terminal or other digital data source:
Synchronous data must be accompanied by
the modem transmit clock (pin 15) or by an
external data rate clock (pin 24). Data tran-
sitions should occur on positive-going
clock transitions; asynchronous data does
not require a transmit clock.
Serial digital data output to the DTE inter-
face: Sync data is accompanied by an inter-
nal data rate (receive) clock (pin 17) that
has positive-going transitions on the data
transition. Async data does not require a
receive clock.
A positive level to the modem when data
transmission is desired
A positive level from the modem in
response to Request to Send and when the
modem is ready to transmit. *
A positive level from the modem when
power is on and ready to operate: In dial-up
operation, the modem must be off hook to
give a high DSR signal.*
Common signal and DC power ground
A positive level from the modem indicating
the presence of a received signal (carrier
detect). *
V.3400
Installation
2-3