Avaya G650 Installing page 36

Installing and cabling the G650 Media Gateway
Required input current
Table 2: G650 Media Gateway worst-case current levels
for a fully loaded G650 Media Gateway. Each empty slot reduces the required input current by
1/4 A.
Table 2: G650 Media Gateway worst-case current levels
VA VDC
667 40
667 42
667 48
667 54
667 60
Before you connect the DC feed cable to the DC power source of the G650 Media Gateway,
check the DC power source. Use a KS-20599 digital voltmeter or an equivalent meter.
To check DC power:
1. Verify that the meter reads between -42.5 VDC and -54.2 VDC across the -48 VDC and
-48-V return distribution leads from the DC source.
2. Verify that the meter reads 0 V between the -48-V return lead of the DC power source and
the approved ground.
3. If either step 1 or step 2 fails the verification, do not continue with step 4. Advise the
customer to have a licensed electrician correct the problem.
4. Connect the DC feed cable for each G650 Media Gateway to the DC power source. For
more information, see
and Figure 10: Grounding for multiple G650 Media Gateways
a. Connect the red insulated 10-AWG lead to the -48-V return (positive) source.
b. Connect the black insulated 10-AWG lead to the -48-V DC (negative) source.
36 Installing the Avaya G650 Media Gateway
ADC Efficiency
16.7 75.4
15.9 75.4
13.9 75.4
12.4 75.4
11.1 75.4
Figure 9: Grounding for a single G650 Media Gateway
shows the worst-case current levels
PF BTU/HR Watts
0.994 2277 667.1328
0.994 2277 667.1328
0.994 2277 667.1328
0.994 2277 667.1328
0.994 2277 667.1328
Minimum DC plant
voltage
Low Voltage
Disconnect (LVD)
voltage
Typical plant voltage
Typical plant float
voltage
Maximum plant
voltage
on page 30
on page 31.