WDS P20, Installation And Operation Manual

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2
This duplication of functionality means the unit will continue to transmit
data even if a failure occurs in one of the transceivers or power supplies.
This capability is important in many applications where uninterrupted
service is required.
In addition to transmitting error codes to a main station, the Redundant
Transceiver Chassis is equipped with alarm connections on the rear
panel which activate when one of the transceivers reports an alarm con-
dition. These are “dry” alarm contacts that allow the connection of cus-
tomer-supplied alarm equipment such as a lamp or sounding device.
The following WDS transceivers can be used with the Redundant Trans-
ceiver Chassis:
• WDS 4710
• WDS 9710
• WDS 9810
• WDS 24810
When these transceivers are ordered installed in a P20 chassis, the last
two digits of the model number change to 20. For example, when the
WDS 4710 is installed in a P20 chassis, the combination is referred to
as an WDS 4720.
Other WDS transceivers may be compatible with the Redundant Trans-
ceiver Chassis. Contact WDS if you are unsure.
2.1 Features
The Redundant Transceiver Chassis provides:
• Fully redundant capability—Standard chassis contains two
transceivers and two power supplies. Provision for optional
redundant antenna port.
• Automatic switchover to alternate transceiver if a failure occurs
• Optional built-in battery backup for AC-powered units
• Rear panel alarm connections for customer-supplied alarm
equipment
• Tabletop or 19 inch rack-mount installation
• Uses standard WDS transceivers inside
• Rear panel diagnostics connection for each transceiver
2.2 Chassis Configurations
The Redundant Transceiver Chassis can be ordered with or without
installed transceivers to meet customer requirements: