Motorola V.34-SDC 用户手册

B-2 Cabling and Interface Pinouts

This appendix describes the following:

• Interface pinouts common to all modem models, including: 

— EIA/TIA 232-D, and ITU V.35 Recommendation modem-to-computer 

interfaces

— NC IN and OUT network control port interfaces

• 326X/326X-SDC cabling requirements and diagnostics

Audio connector (DIAL LINE, LEASE/PRIVATE LINE, and PHONE) pinouts vary 
by country. See Appendix C for your country's pinouts.

The modem’s digital interface conforms to the EIA/TIA 232-D standard and ITU 
V.24, ITU V.28, and ISO 2110; the modem should be connected to a data terminal 
with a compatible digital interface (Table B-1). NOTE: For DTE rates greater than 
38.4 kbps, refer to the “Cabling” section to determine cables and lengths.

1

—

—

—

Not used.

2

BA

103

Transmitted Data 
(TXD)

Digital data transmitted from the local terminal to the remote modem.

3

BB

104

Received Data 
(RXD)

Demodulated data received by the local terminal from the remote 
modem.

4

CA

105

Request To Send 
(RTS)

Sent from local terminal to local modem to ready it for data 
transmission.

5

CB

106

Clear To Send 
(CTS)

Passes from the local modem to the local terminal when the data port is 
clear to transmit data. Occurs in response to Request To Send.

6

CC

107

Data Set Ready 
(DSR)

Indicates the local modem is ready to transmit and receive data.

7

AB

102

Signal Ground

Common signal. Provides a common ground reference point for 
interface circuitry.

8

CF

109

Data Carrier 
Detect (DCD)

Passed from the local modem to the local DTE when an acceptable 
carrier signal is received by the modem.

9

—

—

—

Not Used.

10

—

—

—

Not Used.

11

—

—

Answer/

Originate Select

Signal passed from terminal to modem to select answer/originate 
status. When signal is on, answer signal is selected. When signal is off, 
originate signal is selected. This signal works with Mode=External.