Clear-Com CellCom Battery Pack Charger - Manual (Page 58)

Clear-Com Communication Systems
CellCom V2.0.3 Instruction Manual
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WIRELESS PARTY-LINE
The CellCom basestation provides five wireless party line groups
which allow up to twenty eight members to be connected together in a
conference call. The beltpack keys assigned to the wireless party line
group are assigned as dual talk and listen and party lines connected to
the group are assigned as talk and listen.
When a beltpack or party line talks to a wireless party line group the
talk signal from the beltpack or party line is subtracted from the listen
signal to remove the sidetone resulting from the users voice being
looped back in the conference audio, leaving only the audio from other
members.
Figure 4-4: Wireless Party Line Audio Flow
This facility allows conferencing over a large area between a mix of
beltpacks, party line stations and Eclipse system panels through a
CellCom basestation.
With CellCom release V2.03 beltpacks can only connect to a wired
party line via a wireless party line. Therefore in order to allow
beltpacks to talk to each other and a wired party line a wireless party
line must be set up that includes the wired party line (PLCHA or
PLCHB) and the beltpacks (see Figure 4-5). This ensures that the
audio on the beltpacks is the talk audio and not the sidetone audio.