TB8100 Service Kit User’s Manual Working With the Channel Table 137
Num The number of the channel. This is the number that external channel selection
and Task Manager actions use when changing the channel that the base station
operates on. If you move a row up or down, its channel number changes. If you
edit the channel number, its position in the table changes.
Channel Name The name of the channel. When you create a channel, it is given a default name
of the form ‘Channel nnn’ where nnn is the channel number. You can edit this
name to reflect the channel’s purpose or users.
Receive Frequency The radio frequency that the channel receives on.
Transmit
Frequency
The radio frequency that the channel transmits on.
Signalling Profile The signalling profile assigned to the channel. This profile defines a group of
operating parameters. If the profile is ‘Default’, the next two columns are
editable.
Receive Signalling Indicates the subtone that the channel recognizes as a valid signal on its receive
frequency. If the signalling profile is ‘Default’, you can edit this column,
otherwise it is defined by the profile. ‘Multiple’ means that the profile assigned
to the channel defines more than one subtone.
Transmit
Signalling
Indicates the subtone that the channel includes in its transmissions. If the
signalling profile is ‘Default’, you can edit this column, otherwise it is defined
by the profile.
Select ‘Same as received’ and when the base station is repeating, it will transmit
using the subaudible signalling configured for the receiver. (This option has no
effect when Task Manager or the Tx Key input on the system interface keys the
transmitter. Unless a signal is received with a valid subaudible code, no
subaudible signalling will present on the transmission.)
‘Multiple’ means that the profile assigned to the channel defines different
subtones for different receive signalling.
Channel Profile The channel profile assigned to the channel. This defines a further group of
parameters. If the profile is ‘Default’, the next two columns are editable.
Filter Specifies the audio response characteristics of the channel. ‘Multiple’ means that
these are different for different audio paths or that the receive characteristics are
different from the transmit characteristics (custom channel profiles only). ‘Pre/
De-Emph Speech Band’ and ‘Pre/De-Emph Full Band’ mean that
pre-emphasis is applied to any enabled transmit path and that the equivalent
de-emphasis is applied to any enabled receive path.
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