User Manual

AirLink Pro T1/E1 Rack Mount Installer’s Guide
Product Description
Rev. B - 1/97
1-7
Mount units. The AirLink Pro T1/E1 Rack Mount pair switch the protected
T1/E1 line to provide a protected bypass T1/E1 path.
The backup switch can be opened or closed by an external switch or relay wired
to the CSU SEL connector on the rear panel of the AirLink Pro T1/E1 Rack
Mount.
Alarm Relay Contacts
Major and minor alarm contacts are built into the AirLink Pro T1/E1 Rack
Mount. If an alarm occurs such that an entry is put into the event queue, the
alarm contacts switch to the alarm state for as long as the alarm event persists.
For more information on the AirLink Pro T1/E1 Rack Mount alarm relay
contacts, refer to Chapter 2, Installation and System Administration.
Order Wire Interface
The Order Wire interface is an end-to-end voice communication channel that is
carried on the radio link between the local and remote AirLink Pro T1/E1 Rack
Mount units. Maintenance and service personnel can connect telephones to order
wire ports on the local and remote AirLink Pro T1 units and have direct voice
communication between the local and the remote site.
Order Wire communication can only occur when there is an active radio link
between the local and remote AirLink Pro T1/E1 Rack Mount units (refer to
Chapter 2, Installation and System Administration). The Order Wire channel
is outside of the T1/E1 channel and does not affect the user’s data. The Order
Wire can also be used with 4-wire modems in a large network management
system.
Fail-Safe Link
A reliable link can be created by eliminating all “single points of failure.” This
is illustrated in Figure 3-1 and discussed in detail in Chapter 3, Point-to-Point
Link.
Block Diagram
The following illustration is a functional block diagram of the Cylink AirLink
Pro T1/E1 Rack Mount.