Carrier Access SNMP manual Straight Adapter, 7Null Modem Adapter Pin Assignments

Table 5-7:Null Modem Adapter Pin Assignments

Designation	DCE DB25 (male)	DTE DB25 (male)	Paired Signals
			(Not required)
Shield	1+ (Shield)	1+ (Shield)
Ground	7	7
Secondary TXD	3	2	￿
Secondary RXD	2	3	°
Secondary RTS	5	4	￿
Secondary CTS	4	5	°
Secondary DTR	8	20	￿
Secondary CD	20	8	°

5.7.4 Straight Adapter

The CAC Straight Adapter (P/N 005-0007-25M-9F-Straight) permits connecting the 9-pin COM1 communication port on a local Laptop computer to the 25-pin DCE data female connector on the Dual RS-232 DCE Data and Management Cable, or to 25-pin female DCE connector on the Local Management Cable. Figure 5-7 shows these connections points.

Carrier Access female DB25 DCE Mgt. cable 005-0003 or female DB25 DCE user data cable 005-0001

	DB25 M to DB25 M
	Null Modem
DCE DB25 (male)		DCE Female
	BRAID	DB-9
1 SHIELD		1 SHIELD
7 GND	GND	5 GND
	TXD
2 STXD		3 TX
	RXD		COM-1 Management
3 SRXD		2 RX
	RTS		Local laptop
4 SRTS		7 RTS
	CTS
5 SCTS		8 CTS
	DTR
20 SDTR		4 DTR
	CD
8 SCD		1 CD
	COM-1 Management
	Connection

Figure 5-7: CAC Straight Adapter

The CAC Straight Adapter is built according to the pin assignments listed in Table 5-8.

5-12 9/24/01