Motorola V.34-SDC 사용자 설명서
B-2 Cabling and Interface Pinouts
Inter
face
Pinout
s
Introduction
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.
by country. See Appendix C for your country's pinouts.
EIA/TIA 232-D (Modem to Computer) Interface
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.
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.
Table B-1.
Modem/Computer Interface Connections
Modem/Computer Interface Connections
Pin
EIA/TIA
232-D
232-D
ITU V.24
Signal
Definition
1
—
—
—
Not used.
2
BA
103
Transmitted Data
(TXD)
(TXD)
Digital data transmitted from the local terminal to the remote modem.
3
BB
104
Received Data
(RXD)
(RXD)
Demodulated data received by the local terminal from the remote
modem.
modem.
4
CA
105
Request To Send
(RTS)
(RTS)
Sent from local terminal to local modem to ready it for data
transmission.
transmission.
5
CB
106
Clear To Send
(CTS)
(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.
clear to transmit data. Occurs in response to Request To Send.
6
CC
107
Data Set Ready
(DSR)
(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.
interface circuitry.
8
CF
109
Data Carrier
Detect (DCD)
Detect (DCD)
Passed from the local modem to the local DTE when an acceptable
carrier signal is received by the modem.
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.
status. When signal is on, answer signal is selected. When signal is off,
originate signal is selected. This signal works with Mode=External.