Carrier Access SNMP manual Connecting the Power and Ground, CAC Straight Adapter Pin Assignments

Connecting the Power and Ground

Table 5-8: CAC Straight Adapter Pin Assignments

Designation	DCE DB9 female	DCE DB25 male	Pair Signals
			(Not required)
Shield	+ (Shield)	1+ (Shield)
Ground	5	7
Secondary TXD	3	2	￿
Secondary RXD	2	3	°
Secondary RTS	7	4	￿
	6	6	°
Secondary DTR	4	20	￿
	8	5	°
Secondary CD	1	8	°
	9	22

5.8 Connecting the Power and Ground

5.8.1 DC Power Connector Input

Warning: Connect only -48 Vdc power to the DC input connector.

The Access Bank II SNMP has a 3-position DC Power Connector Input located on the Control Panel, as shown in Figure 5-1.To conform with UL 1459 and National Electrical Code safety requirements, the Access Bank II SNMP is equipped with solid-state, automatic-resetting, current-limiting devices to protect the -48V Input and +DC Return power inputs on this connector from AC power surges, lightning, or inductive motor spikes. This means there are no internal fuses for you to replace. Pinout assignments for this connector are defined in Table 5-9.

Table 5-9: Power Connector Pinout Assignments

Pin Number	Signal
1	AB115 Power Converter Cube, or -42 to -58 Vdc
	power source
2	DC return, to power supply + terminal
3	Telco or safety (green-wire) ground

9/24/01 5-13