Dc Power - Avaya G650 Installing

2. Verify that the voltage meter reads 0 VAC by measuring the voltage between the neutral
and ground sides of the receptacle. Request that a qualified electrician correct any
problems before proceeding to Step 3.
3. Set the AC main circuit breakers to OFF when you finish checking the AC power.

DC power

Figure 11: Typical DC power for a G650
G650 Media Gateway.
Each G650 Media Gateway can be equipped with a maximum of two 655A power supplies, one
is always provided in slot 0 and a redundant unit can be supplied in slot 15. DC power is
supplied, via a DC feed cable, to one connector on the backplane of the G650 Media Gateway
and bussed to each power supply slot. AC and DC current can be supplied to the 655A power
supplies at the same time. When both AC and DC current are present, the 655A uses AC first
and switches to DC without any interruption in service if the AC current fails.
Each G650 Media Gateway, with either single or redundant power supplies, draws a maximum
of 17 amps of DC current.
Required Input Current
Table 4: G650 Media Gateway worst case current levels
current levels for a fully-loaded G650 Media Gateway. Each empty slot reduces the required
input current by 1/4 A.
Table 4: G650 Media Gateway worst case current levels
VA VDC
667 40
667 42
667 48
667 54
667 60
Before you connect the G650 Media Gateway DC feed cable to the DC power source, check the
DC power source using a KS-20599 digital voltmeter (or equivalent). To check DC power:
1. Verify that the meter reads between -42.5 VDC and -54.2 VDC across the -48 VDC and
-48V Return distribution leads from the DC source.
ADC Efficiency
16.7 75.4
15.9 75.4
13.9 75.4
12.4 75.4
11.1 75.4
on page 52 shows a typical DC power layout for a
on page 51 shows the worst case
PF BTU/HR
0.994 2277
0.994 2277
0.994 2277
0.994 2277
0.994 2277
Watts
667.1328 Minimum DC plant
voltage
667.1328 Low Voltage
Disconnect (LVD)
voltage
667.1328 Typical plant voltage
667.1328 Typical plant float
voltage
667.1328 Maximum plant
voltage
Issue 2 January 2005 51