Vocality V200, Руководство пользователя

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Vocality User Manual
User Manual for V200
Valid for V08_08.02 or V08_48.02
Page 101 of 114
5.20.2 Configuration
Figure 5-72 above shows one hub unit and three remotes. All arrows refer to audio
channels and not aggregates. Each remote is providing a separate transmit audio,
shown by the feed going back to the hub. (These are colour-coded red, blue and green
for Nodes 1, 2 and 3 respectively.) Each Node also receives the purple audio
transmission from Node 0. This topology is achieved by configuring a unique logical
broadcast channel in the destination field for each channel, which allows it to join a
broadcast multiplex, be extracted from a broadcast multiplex, or both.
You must ensure that all trib ports which are configured to receive data from a
broadcast highway are configured in the same way as the port which is generating the
data. For example if voice is being used, they must be configured with the same codec
and silence suppression setting. Broadcast tribs do not signal any information about the
type of the call, so codec negotiation cannot happen automatically.
Overview: Broadcast Highway
Broadcast highway is the term used to describe an internal communications path
between trib ports.
Broadcast highways may be used to carry trib data of most types, but is typically used
for voice or serial data.
Each highway is numbered within a node.
Broadcast highways may be routed locally within a card, or across the backplane from
one slot to another, or across aggregates.
Typically a broadcast highway will have one data source and one or more data sink.
CAUTION: There is no signalling for broadcast highways. If multiple data sources
are configured then this can only be detected in the corruption of trib payload.
Under some circumstances, in a voice call environment, multiple data sources may
be permitted, provided that radio discipline is kept and accepting the risk of
exceeding configured bandwidth limits.
5.20.3 Voice menu settings
You need to assign all broadcast channels a destination which involves transmitting to
the broadcast highway
BTX
nnn (where nnn is a logical channel number from 0 to 127).
To receive this channel at a remote site, you need to use the corresponding code
BRX
nnn to receive from the broadcast highway and transmit to line.
It is also possible to define the return path to the hub at the same time by specifying
the destination code as
BTR
ttt
,
rrr at both ends where ttt specifies a logical TX code and
rrr specifies a logical RX code. To pick out the right channels at each end, ttt at one end
must match rrr at the other and vice versa.
Figure 5-73 shows the voice settings on node 0. Channel 1 is configured as four wire
and to transmit as
BTX0
. Channels 2 and 3 are set to receive
BRX1
and
BRX2
from
nodes 1 and 2 respectively. Channel 4 is set to transmit on broadcast channel 4 but
receive on broadcast channel 3.