ADTRAN 1200305L1 system manual DB-78 Connector Pinout, PIN Signal Description

ATLAS 550 System Manual			Section 2, Engineering Guidelines
		Table 16. V.35 Winchester Pinout (Continued)
Pin	CCITT		DESCRIPTION
U	113		External TX clock (ETC-A) from DTE
W	113		External TX clock (ETC-B) from DTE
NN	—		Test mode (TM) to DTE

Dual USSI Option Module (P/N 1200754L1)

Tables 17 through 22 show pinouts for the available interfaces of the Dual USSI Option Module and the system part numbers required for ordering.

Table 17. DB-78 Connector Pinout

PIN	SIGNAL DESCRIPTION	PIN	SIGNAL DESCRIPTION
1	RXD-A 2	41	RTS-B 2
2	RXD-B 2	42	GND
3	RXC-A 2	43—48	NOT USED
4	RXC-B 2	49	MOD2
5	TXD-A 2	50	MOD0
6	TXD-B 2	51	EXT-TXC-A 1
7	TXC-A 2	52	DTR-B 1
8	TXC-B 2	53	DTR-A 1
9	EXT-TXC-A 2	54	DCD-B 1
10	EXT-TXC-B 2	55	DCD-A 1
11—17	NOT USED	56	DSR-B/RI 1
18	GND	57	DSR-A 1
19	GND	58	CTS-B 1
20	CHASIS GND	59	CTS-A 1
21	CTS-A 2	60	CHASIS GND
22	CST-B 2	61	GND
23	DSR-A 2	62—68	NOT USED
24	DSR-B/RI 2	69	MOD1
25	DCD-A 2	70	EXT-TXC-B 1
26	DCD-B 2	71	TXC-B 1
27	DTR-A 2	72	TXC-A 1
28	DTR-B 2	73	TXD-B 1
29—37	NOT USED	74	TXD-A 1
38	RTS-A 1	75	RXC-B 1

Note: 1 or 2 indicates the port on the USSI Module

61200305L1-1F © 2002 ADTRAN, Inc. 37