User's Manual

800MHz & VHF Cell Enhancers

Maintenance Handbook

H/book Number:-50-078001HBKM

Issue No:-

Date:-02/09/2004

Page:-

13 of 88

2. OVERVIEW/SYSTEM DESCRIPTION

The AFL Channel and/or Band Selective Cell Enhancers are 2-way on-band repeaters.

Various models are available to cover frequency bands from 50MHz to 3000MHz. The

principle sphere of applications is in urban areas where the topology is such that shadows

occur in the propagation pattern (for example within large buildings, conference centres,

road and rail tunnels, etc.)

The frequency bands that are passed by the Cell Enhancer are set as per the specific

customer requirements.

AFL manufacture a wide range of Cell Enhancers, configured for each customer's specific

requirements. Two basic physical variants are available, a rack mounted version to fit in a

standard 19" rack and an environmentally sealed wall mounted version which requires no

further enclosure.

This system provides 800MHz Channelised (x 24) & VHF Simplex/Duplex coverage for the

various concourses platforms and tunnels with a 12V battery backup service (for the

800MHz line amplifier) that will guarantee limited continued coverage in case of mains

power failure.

Each active module is alarm monitored with each shelf/ wall-case having a summary alarm

with a visual ‘alarm active’ indication and a door intrusion alarm included for the wall cases.

All alarms are volt-free, relay contact pairs which may be easily configured into an

RS232/modem system such that automatic remote monitoring by computer may be

achieved.