Clear-Com BS850 (Last time buy) - Manual (Page 11)

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Base stations can be configured with up to four receivers and two transmitters, supporting up to four
Beltpacs in full-time transmit, full-duplex operation. Two or three bases interconnected can support up to
twelve Beltpacs operating at once. The Push-to-Transmit-Shared (PTS) feature supports several
Beltpacs sharing the same frequency. In this mode, one Beltpac user on a shared frequency can transmit
at a time. If one user is already transmitting on that frequency, and another user attempts to transmit, the
second user will hear a “busy” signal. A maximum of sixteen Beltpacs can be used with a system (one to
three bases).
All audio received by the base is routed to the base audio processor for further distribution to external
connections, and to the base transmitter for rebroadcast to each Beltpac. DSP-based audio
processing allows audio to be mixed and routed completely under firmware control.
All communication is full-duplex, so a Beltpac user can talk and listen at the same time. The base
transmits to all the Beltpacs on one or two RF channels. Beltpacs can transmit on separate RF
channels so more than one user can talk at a time, or some Beltpacs may share the same RF
channel, in which case only one user sharing the channel may talk at a time. When Beltpacs transmit
on separate RF channels, they can transmit either continuously in Push-To-Enable (PTE) mode or
intermittently in Push-To-Transmit (PTT) mode.
The base receives each of these transmissions, mixes the audio, and rebroadcasts to each Beltpac
as appropriate. Each Beltpac user hears the rebroadcast of his own transmission, confirming his
message has been received. At least three systems can be daisy chained to allow additional
channels to operate simultaneously. When Beltpacs operate in PTE or PTT mode, they automatically
update their status to the base periodically.
When several Beltpacs share the same frequency, they operate in PTS mode. When one PTS user is
talking on a particular frequency, all other users of that frequency are locked out so they cannot
interfere with the transmission. When operating in PTS mode, Beltpacs only update their status to the
base while their user is talking.
For increased flexibility, combinations of shared frequencies and individual frequencies can be
combined. A single base can address up to sixteen (16) Beltpacs in various combinations of PTE,
PTT, and PTS modes. Some receiver modules can be configured for PTS operation while others are
left for PTT or PTE operation. In a system with daisy chained bases, even more combinations are
possible.The cabled system interface provision on the base allows a cabled intercom system to be
used with wireless stations. Both 2-wire and 4-wire interfaces can be active at the same time for
wiring flexibility.
An Auxiliary input and output are provided to allow connection to other audio systems such as
program audio sources or an additional 4-wire intercom connection.