Calendar

MONITORING OMNIBUS LINKS

NO LOSS OF AIR TIME

Alarm data is transmitted during voice pauses

Data packets are muted and inaudible to staff

User's PTT has priority and always gets access

Secondary access through dial-up modems

SHARED VOICE \ DATA LINKS

The BT-62-DV dual 6 wire VF port unit allows these units to be fitted in series with any 'in use' VF links. The telemetry transactions occur in the background on an event driven basis, and are muted from the users.

a) When idle internal relays are relaxed.

b) To send data relays energies to intercept 6w

c) Path is broken for 1sec when sending data.

d) Rx units also break circuit if they detect FFSK data on line.

e) Thus data data noises are prevented from passing through the unit to annoy users.

SMART TELEMETRY

Intelligent units function in complete isolation

Without the need for a central unit or polling PC

Fast event driven relay output mapping functions

Periodic hourly/daily health checks logged to PC


	Users Voice from Control Room end

	At Each Site Data is separated from Voice from

Mixed Systems

Following an alarm event the BT-xx units will dial up a selection of numbers until it contacts a BIT-VISION program or BT-62 network controller. Spurs to radio connected sites may be added by using the VF interface on the rear of the BT-62..

Calling in from home

Even if main PC is off, Technicians can call in on their home PC and access entire radio network. they can also look at a log of file of alarms received during the night so far.

Multiple Networks

Rather than have a separate PC on each Network, One PC can be made to access any number of different multiple networks at once, by fitting a BT-xx to the terminating end of each network. These units have an RS485 bus connection on COM3 which allows them to be daisy chained together. This allows data packets to be automatically routed the right network like a telephone exchange..

Radio room Congestion

Where the radio room is very congested, it may not be possible to put a terminating unit on every network. In which case This way when a message is sent it will always get through, regardless of what other networks have voice audio on them. However this is not strictly necessary

Simple Console Integration

The simplest reduced configuration is to have a BT-62 placed prior to the console operators headset and Mic. This way any alarm data packets that arrive, are passed through the unit and become muted. The only downfall of this configuration is that the operator must select a site via the console in order for the PC to access a site.

Combining several networks into one BT-62

If a combining bridge is available then this can gather the audio from all your consoles and feed it into a single BT-62 unit. This works providing the PTT ‘E’ leads get turned around and sent to all radio sites. The presence of a PTT ‘E’ lead tells the BT-62 not to transmit because a conversation is in progress.

However where you are combining the audio from all the consoles, there is a chance of loosing alarm data packets. This is because the PTT ‘E’ leads do not cross from one console to another and hence a conversation in one console may interrupt a packet in another.