Pyramid WM-1000, Product Manual

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3.4 Trunking operation (Smart Trunking II
tm
)
When the WB-1000 is connected to a trunking mobile, it should be programmed for trunking in the
CPS software. The WM-1000 handheld operator will need to pair with the programmed WB-1000 at
least once to synchronize the programming from the WB-1000. Smart Trunking II tm creates a subset
of the mobile trunking system between the WB-1000 and the WM-1000 handheld user. Users will get
clear to talk tones on their WM-1000 handheld after the WB-1000 negotiates the handshake on the
mobile radio.
When the WM-1000 user keys their handheld radio, the WB-1000 will attempt to acquire a voice chan-
nel on the trunking system by keying the mobile for 200mS and monitoring the on-air detect line from
the mobile. If it does not see the radio transmit at all (system is busy), it will send a ‘low tone’ to the
hand held operator to alert them that the system is busy. If unsuccessful after 30 seconds, the WB-
1000 will transmit low tone to alert the handheld operator that the call attempt failed.
In a successful call, the WB-1000 detects that the mobile is transmitting, it will continue to monitor the
on-air line until the transmitter remains keyed for at least 250mS to ensure that the radio isn’t merely
handshaking or retrying. After successful acquisition of a voice channel on the trunking system, the
WM-1000 user will hear a ‘clear to talk’ beep from their handheld and know it is OK to begin talking.