Detailed Features/Benefits Description 2-23
One of the critical tasks is positioning large concrete bridge supports. This operation requires the
precise co-ordination of several teams of workers (eg. crane operators, ground-based labourers,
architects and surveyors, etc.). A site manager is responsible for co-ordinating these different teams
of people.
This particular requirement calls for guaranteed one-way communication from the manager to the
other groups. You therefore propose to programme channel 1 as Receive Only on all radios except
the site manager's.
3.4.9 Time Out Timer
The Time Out Timer (TOT) enforces communication discipline by limiting the amount of time that a
radio can constantly transmit. This prevents a single radio user from tying up the entire channel for
long periods of time and ensures more efÞcient channel use.
The TOT is activated, and it's duration is set, using the CPS. The duration of the timer can be set to
between 15 and 180 seconds.
The TOT is started when the radio operator presses the PTT. If the TOT expires, the transmission is
curtailed and the user must release and re-press the PTT to continue transmitting.
3.4.10 Channel Alias
The P080 radio has a 7-character display that allows a meaningful name to be assigned to a
channel. This simpliÞes end-user operation and enables more efÞcient communications amongst
your customer's mobile workforce.
To better understand the beneÞts of Channel Alias, imagine that you have been asked to set up a
simple communications system for medium sized factory. Working closely with the customer, you
have identiÞed a number of distinct groups within the workforce, each with different communication
needs.
To support these workgroups, you create a number of different channels:
In reality these channels may be differentiated by TX/RX frequency and PL code (ie. some channels
share the same frequency but have different PL codes, whereas other channels are on completely
different frequencies). However, this technical differentiation is hidden from the end-users; they
simply have to select the appropriate channel alias to communicate with the team of people they
need to talk to.
Table 2-17 Channel Alias example
Channel Channel Alias Workgroup
1 SOS The "emergency" channel, reserved for critical situations.
1 STORES Members of staff working in the materials stores
2 LINE 1 Supervisors supporting Production Line 1
3 LINE 2 Supervisors supporting Production Line 2
4 WRHOUSE Members of staff working in the warehouse
5 SECURTY Security personnel
6 FACILTY Members of the facilities support department
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