External Paging Encoder Port
The external paging encoder port allows use of an external tone paging encoder with a dispatch
console to provide tone paging services. The dispatch console transmits the paging tones generated
by the encoder on the selected conventional radio resource or resources. If a dispatcher wants to send
paging tones on an ASTRO
®
25 Conventional channel, an external paging encoder is required.
This feature has an RJ-45 connector with an analog 600-Ohm audio input to which the paging tones
are applied. A paging Push-to-Talk (PTT) input enables a dry contact closure to be applied that
indicates when the dispatch console should transmit the tones on the radio channel or channels.
When the dispatch console sees the paging PTT input go active, it transmits the audio appearing at the
audio input on the selected conventional channels. If Private Line (PL) Stripping is enabled on a
conventional channel, the PL is stripped when the paging tones are transmitted.
No de-emphasis filtering is performed and no talk extend is provided with externally generated tones.
The external paging encoder provides these functions.
Table 15: External Paging Encoder Port Pinout
Pin Number
Description (+) and (–) symbols indicate pin
polarity
1
Paging PTT In (–)
2
Paging PTT In (+)
3
Paging Audio In (–)
6
Paging Audio In (+)
Local Logging Recorder Port
The local logging recorder port allows an external logging recorder to be connected to a dispatch
console. The port provides an RJ-45 connector with a 600-Ohm analog output. The audio that appears
on this output is configured and is typically the audio transmitted and/or received at that dispatch
console.
The configuration of audio presented at this port is tied to the physical dispatch console, so that no
matter what user is logged on the dispatch console, the same type of audio is logged. This
configuration is done as part of configuring the dispatch console at the Provisioning Manager. The local
logging recorder port is configured to log any combination of the following audio sources:
• Audio received from the currently selected radio resources. Either the individual volume setting of
the radio resource or the master volume control on the speaker or headset jack adjusts the level of
this volume.
• Microphone audio being transmitted to the radio resources currently selected by the operator.
• Microphone audio being transmitted to the radio resources not selected by the operator.
• Any tones generated by the dispatch console that appear in its speakers, for example, trunking
tones and emergency tones.
• Tones generated by an external paging encoder.
Long-term, console-specific audio recording is used to record a portion of the inbound and outbound
audio present on a specific dispatch console. This recording is done by providing a logging port at the
dispatch console and wiring that port to a track of an audio recording device. These recordings are
typically archived for long-term storage, and provide a historical record of the radio communications
made at a given dispatch console.
MN000672A01-E
Chapter 4: USB Audio Interface Module
107
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