Access To Chassis; Chassis Grounding; Power Source - Cisco 450 Hardware Installation Manual

Bench-Mounted
If the chassis is installed using slide rails, check for blocked ventilation ports when it is in position in the rack
or cabinet. Make sure that the ventilation ports of the Cisco VG450 Voice Gateway are not blocked.
Tip
Baffles can help isolate exhaust air from intake air. Baffles also help draw cooling air through the cabinet.
The best location for the baffles depends on the airflow patterns in the rack. You can test the airflow by
experimenting with different equipment arrangements.
Bench-Mounted
If the unit is placed on a bench-top, do not stack other equipment or paper on the chassis. Provide plenty of
space for air circulation (front to back). Inadequate ventilation can result in overheating and damage.

Access to Chassis

Allow space at the rear of the chassis for cable connections. Also consider the need to access the chassis for
future upgrades, maintenance, and troubleshooting.

Chassis Grounding

Chassis grounding is provided through the power cable, which uses a standard grounding plug. However, the
chassis also requires a reliable earth ground using the earth ground lug and hardware provided.

Power Source

A Cisco VG450 Voice Gateway with AC power supply autoselects either 100–127 volt or 200–240 volt
operation. AC versions include a 6-foot (1.8-meter) electrical power cord. (A label near the power cord
indicates the correct voltage, frequency, current draw, and power dissipation.)
Power Suppy Considerations
Cisco VG450 Voice Gateway requires significantly more power because of its high-density ports and OPX
'Lite' requirements.
This require a larger 48V battery backup that may need to be custom built.
To handle power failure conditions, an uninterrupted power supply (UPS) is needed. UPS is widely available
in all markets, including emerging markets (due to prevalence of UPS for personal computers). Thus, a separate
UPS for Cisco VG450 Voice Gateway is a viable option when the ISR/UPS is not co-located with it.
If you suspect that your AC power is not clean—if lights flicker often or there is machinery with large motors
nearby—have a qualified person test the power. Install a power conditioner if necessary.
Danger Do not work on the system or connect or disconnect cables during periods of lightning activity. Statement
1001
Cisco 450 Voice Gateway Hardware Installation Guide
12
Planning Your Installation