Dial Shelf Field-Replaceable Units
Cisco AS5800 Universal Access Server Hardware Installation Guide1-26
Bell alarm signaling
The PEMs provide relay outputs for standard central off ice bel l alarms. Thes e bell alarm contacts
are available on a terminal plug mounted on the PEM front panel.
Online insertion and removal (OIR)
The PEMs support OIR, which means that you can remove or repla ce a PEM while the s ystem i s
operating; system operation is not affected.
The PEMs are located on either side of the filter module below a removable rear cover. Figure1-14
shows the location of the PEMs as viewed from the dial shelf rear.
Figure1-14 Power-Entry ModulesDial Shelf Rear View
The PEMs contain two LEDs on the front panelPOWER and MISWIRE. The POWER LED
indicates that input voltage is present a nd th e PEM cir cuit bre ak er is on; the MISWIRE LED should
remain off, but lights if the two DC conductors entering the PEM DC-input power terminal block
(see Figure1-14) are reversed.
For detailed specification tables, refer to AppendixA, Cisco AS5800 Specifications.
H11655
48V48V
RTN
CNCNO
POWER
MISWIRE
CNCNO
POWER
MISWIRE
48V48V
RTN
Power switches
LEDs DC-input power
terminal block Bell alarm
terminal block
Filter module
PEM front panel PEM front panel