Nortel Networks 553-3001-211 Implementation guidelines, RS-422 interface pin assignments, Eia

Page 390 of 894 NT6D80 MSDL card

supported circuit type. It also indicates whether the signal originates at the DTE or DCE device.

Table 146

RS-422 interface pin assignments

		EIA
Pin	Signal Name	Circuit	DTE	DCE
1	Frame Ground (FG)	AA	—	—
2	Transmit Data (TXa)	BAa	X
3	Receive Data (RXa)	BBa		X
4	Request to Send (RTS)	CA	X
5	Clear to Send (CTS)	CB		X
7	Signal Ground (SG)	AB	—	—
8	Receive Ready (RR)	CF		X
12	Receive Signal Timing (RST)	DDb		X
13	Transmit Data (TXb)	BAb		X
14	Transmit Signal Timing (TSTb)	DBb		X
15	Transmit Signal Timing (TSTa)	DBa		X
16	Receive Data (RXb)	BBb		X
17	Receive Signal Timing (RSTa)	DDa		X
20	Data Terminal Ready (DTR)	CD	X
23	Terminal Timing (TTa)	DAb	X
24	Terminal Timing (TTb)	DAa	X

Implementation guidelines

The following are guidelines for engineering and managing MSDL cards:

•An MSDL can be installed in any empty network card slot.

553-3001-211 Standard 2.00 September 2004