•
When you make the settings for the DC source voltage, you must consider the voltage drops between
the DC power supply and the DC input connector on Cisco VG310 or Cisco VG320. To ensure optimal
performance, the input voltage at the DC input connector should not be less than 11.5 V.
•
Use a battery of higher capacity if you require longer periods of battery operation (for example, up to 8
hours).
•
If you use a battery of high capacity or a high-capacity DC source to power the chassis, install an external
fuse for protection against fault and fire.
Power Connector for the DC Power Supply
The Cisco VG310 and Cisco VG320 analog voice gateways support the Molex Mini-Fit Jr. 5557 Series,
8-circuit dual-row, +12V DC power connector (Molex P/N 39-01-2085). The +12V DC power input is designed
to be used with an external UPS system, and it has status signals that are reported to Cisco VG310 or Cisco
VG320.
The following table shows the connector pin assignment for the +12V DC power connector pin assignment.
Table 9: +12V DC Connector Pin Assignment
Definition
SW Register
0x4A80_0038
Description
Direction
Pin
—
—
Enable (tie low)
Input
1
—
—
+12V (power)
Input
2
Battery Missing:
Fail 1 = missing
Fail 0 = good
Bit 6:
REP_MIS_BAT
REP_BAT (tie
low)
Output
3
—
—
GND (power
return)
Input
4
Battery on/off:
Status 1 = off
Status 0 = on
Bit 4: BAT_ON
ON_BAT (tie low)
Output
5
—
—
+12V (power)
Input
6
Battery power:
Level status 1 = low
Level status 0 = okay
Bit 5: BAT_LOW
LOW_BAT (tie
low)
Output
7
—
—
GND (power
return)
Input
8
Cisco VG310 and Cisco VG320 Voice Gateways Hardware Installation Guide
OL-31292-01
39
Installing the Cisco VG310 and Cisco VG320 Voice Gateways
Connecting the Chassis to a +12V DC Power Supply
