Motorola and V.32bis, V.34-SDC, 326X V.34 Dial LINE, Lease Private LINE, Phone Connector Pinouts

Interface Pinouts

Table B-2.

ITU V.35 Modem/Computer Interface Connections (Continued)

Pin	V.35 Signal	Definition
21	Loop 2 Control	Signal initiated at local terminal and passed to local modem,
		causing it to initiate remote digital loopback test (V.54 Loop 2).
22	Ring Indicator (RI)	Passed from local modem to local terminal. On during ringing,
		off between rings and when no ring received.
23	External Transmit	Transmit timing signal generated by some synchronous DTEs,
	Clock (B)	providing clock to the local modem.
24	External Transmit	Transmit timing signal generated by some synchronous DTEs,
	Clock (A)	providing clock to the local modem.
25	Test Indicate (TI)	Local modem signals to local terminal when local modem is in
		test. The terminal can initiate a Busy Out condition on this
		circuit.

Differences, EIA/TIA 232-D and ITU Rate V.35 Interfaces

There are some differences in how your modem operates when using EIA/TIA 232-D and ITU Rate V.35 electrical interfaces. These differences, and settings to use when operating with a V.35 interface, are as follows.

When a V.35 Electrical	The Following Options
Interface is Selected...	Cannot Be Selected...	Set:
Pin 11 is not supported.	Mode=External	Mode=
	(AT*CA2)	Originate (AT*CA0)
		Answer (AT*CA1), or
		Auto (AT*CA3)
Pin 12 is not supported	—NA—	—NA—
Pin 13 is not supported	—NA—	—NA—
Pin 14 is not supported	Ext Cntrl=Pin 14	Ext Cntrl=Pin 20
	(AT*OC0)	(AT*OC1—default).
	Restore=FP/116	—NA—
	(AT*RE3)
	Restore=FP/116.ACU
	(AT*RE6)
Pin 16 is not supported	—NA—	—NA—
Pin 23 is not supported	—NA—	Switch S1 on modem rear
		panel to the Off (up) position.

DIAL LINE, LEASE (PRIVATE) LINE, PHONE Connector Pinouts

DIAL LINE, LEASE (PRIVATE) LINE, and PHONE connector pinouts vary by country. Consult Appendix C for your country’s pinouts.

B-6 Cabling and Interface Pinouts