Carrier Access SNMP manual Null Modem Adapter, CAC Local Management Adapter Cable Pin Assignments

RS-232 Management

Table 5-6: CAC Local Management Adapter Cable Pin Assignments

Designation	DCE-DB25	D-Sub-26	Paired Signals
	(female)	(male)	(Not required)
Shield	1+ (shield)	1+ (shield)
Ground	7	7
Secondary TXD	2	14	￿
Secondary RXD	3	16	°
Secondary RTS	4	19	￿
Secondary CTS	5	13	°
Secondary DTR	20	10	￿
Secondary CD	8	12	°

5.7.3 Null Modem Adapter

Converting the Access Bank II SNMP from local management to dial-in/dial-out remote manage- ment and/or alarm reporting requires using the 25-pin male to 25-pin male CAC Null Modem Adapter (P/N 005-0002) included with each Access Bank II SNMP purchase. The Null Modem Adapter is equipped with a DB25 RS-232 male connector on the DTE end and an RS-232 DB25 male connector on the DCE end. The DTE DB25 male connector can be connected either to the 25-pin DCE female connector on the CAC Local Management Cable described above, or to the 25-pin female connector on the RS-232 data connector on the DCE end of the CAC Dual RS-232 DCE Data and Management Cable. The 25-pin DCE female RS-232 end is for attachment to a Hayes-compati- ble modem for dial-in/dial-out to a remote printer or pager, or to a remote 486 or higher PC with the MS Windows-based Remote Monitor software or MS Windows Hypterterm (or compatible) VT100 emulation program installed. These programs are included with every Access Bank II SNMP.

Figure 5-6 shows the connection points.

DB25 M to DB25 M

Null Modem

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

DCE DB25 (male)

1 SHIELD

7 GND

2 TX

3 RX

4 RTS

5 CTS

20 DTR

8 CD

DTE DB25 (male)

BRAID
	1 SHIELD
GND	7 GND
RXD
	3 RX
TXD		Remote Management
	2 TX
CTS		(modem)
	5 CTS
RTS
	4 RTS
CD
	8 CD
DTR
	20 DTR

Figure 5-6: CAC Null Modem Adapter

The CAC Null Modem Adapter is built according to the pin assignments defined in Table 5-7.

9/24/01 5-11