Itu Rate V.35 Modem-To-Computer Interface Pinouts - Motorola 3260FAST User Manual

ITU Rate V.35 Modem-to-Computer Interface Pinouts

The modem's digital interface conforms to ITU Rate V.35. The modem should be
connected to a data terminal with a compatible digital interface (see Table B-1).
Table B-2.
ITU V.35 Modem/Computer Interface Connections
Pin V.35 Signal
1 Frame Ground
2 Transmit Data (A) Digital data transmitted from the local terminal to the remote
3 Receive Data (A)
4 Request To Send
(RTS)
5 Clear To Send
(CTS)
6 Data Set Ready
(DSR)
7 Signal Ground
8 Data Carrier
Detect (DCD)
9 —
10 —
11 —
12 Receive Clock (B) Timing signal extracted from the received carrier. Local modem
13 Transmit Clock
(B)
14 Transmit Data (B)
15 Transmit Clock
(A)
16 Receive Data (B)
17 Receive Clock (A) Timing signal extracted from the received carrier. Local modem
18 Loop 3 Control
19 —
20 Data Terminal
Ready (DTR)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Definition
Frame (or protective) ground.
modem.
Demodulated data received by the local terminal from the
remote modem.
Sent from local terminal to local modem to ready it for data
transmission.
Passes from the local modem to the local terminal when the data
port is clear to transmit data. Occurs in response to RTS.
Indicates the local modem is ready to transmit and receive data.
Common signal. Provides a common ground reference point for
interface circuitry.
Passed from the local modem to the local DTE when an
acceptable carrier signal is received by the modem.
Not Used.
Not Used.
Not Used.
transmits this signal to the DTE to synchronize received data.
Local modem sends an internally generated transmit timing
signal to the local terminal to synchronize transmitted data.
Digital data transmitted from the local terminal to the remote
modem.
Local modem sends an internally generated transmit timing
signal to the local terminal to synchronize transmitted data.
Demodulated data received by the local terminal from the
remote modem.
transmits this signal to the DTE to synchronize received data.
Initiated at the local terminal and passed to local modem,
causing it to initiate a local analog loopback test.
Not Used.
108.1—Sent by the DTE, this signal causes connection of the
modem to the phone line.
108.2—Sent by the DTE, this signal allows connection of the
modem to the phone line.
Cabling and Interface Pinouts B-5