Specifications

Appendix A: Specifications for DEFINITY media gateways
408 Hardware Description and Reference for Avaya Communication Manager
UPS
An external, uninterruptible power supply (UPS) provides a longer backup time than holdover
batteries. These batteries have holdover times that vary from less than 10 minutes to up to 8
hours. The UPS can replace the batteries and the battery charger. The UPS connects from the
AC power source to a AC power cord on the cabinet. If AC power fails, the UPS supplies its own
AC power to the cabinet.
AC power-distribution unit (J58890CH-1)
The following figure shows a typical AC power-distribution unit that is used in some MCC1
cabinets. The AC power-distribution unit sits at the bottom of an MCC1 cabinet.
Figure 88: AC power-distribution unit (J58890CH-1) (front)
Power backup
Two types of battery assemblies are used for power backup: small and large. The small
batteries are usually located at the center rear of a MCC1 gateway. The large batteries are
usually located inside the battery cabinet.
Small batteries
The small batteries are an 8 Amp-hour batteries that are fused for short circuit protection and
charged by the J58890CH-1. The batteries also contain a thermal sensor that changes the
charging voltage depending on battery temperature.
The small batteries provide short-term battery holdover. If AC power fails, 48 VDC batteries
supply system power for:
● 10 seconds in a PPN cabinet
● 15 seconds in an EPN cabinet
Circuit
breakers
Rectifier
modules
Ring
generator
Ring generator
fuse
Battery
interface unit
psdfacp1 RPY 053097