Connection - Motorola APX 7500 Detailed Service Manual

Feature Operation: Crosspatch Operation
Signals include:
• RX_AUDIO – This is an unbalanced receive audio output relative to ground. The output is
300mVrms nominal for 60% rated receive system deviation. This output is always analog when
receiving analog or digital transmission. PL tones are stripped off this audio. This output is
muted while the radio is muted to invalid RF signals.
• CP_CHAN_ACTIVITY* – This is an open drain logic output indicating when audio is at the
speaker. When active, it will be pulled to less than 0.8VDC.
• CP_PTT* – This is a logic input to cause the radio to transmit. The radio will transmit when this
input is pulled to less than 0.8VDC to ground.
• CP_AUX_TX – This is an unbalanced low level transmit audio input relative to ground. The
input sensitivity is 300mVrms nominal for 60% rated transmit system deviation.
• GND
When the Consolette receives a qualified over-the-air signal, the Consolette will assert its
CP_CHAN_ACTIVITY* output pin, filter alert tones (ex. Talk Permit Tones) from the audio and then
route receive audio to its crosspatch connector pin, RX_AUDIO.
When the CP_PTT* input pin becomes active, the Consolette will key up, and transmit audio from
the crosspatch connector pin, CP_AUX_TX.
The Crosspatch hardware is designed such that the channel active output from one Consolette is the
correct level to drive the PTT input on another, and the receive audio output level on one is correct to
serve as transmit audio input to the other.
NOTE: The auxiliary (APCO) PTT input is mutually exclusive with the Crosspatch CP_PTT*. As a
result, when Crosspatch is enabled, the APCO PTT is disabled and A(tx) is no longer routed.

4.15.1 Connection

The Consolette comes equipped with the Crosspatch functionality. To operate the feature, first
connect a cable between two APX Consolettes via the dedicated RJ45 Crosspatch connector on the
rear panel. Cables are not provided by Motorola, refer to
Panel".
The Crosspatch feature can be enabled in the Consolette codeplug via the Configuration App. To
disable the Crosspatch functionality, disconnect the cable or set the feature to disabled in the
codeplug. Additionally, a softmenu on the auxiliary display or one of the 3 programmable buttons on
the front panel can be assigned to the Crosspatch feature allowing a user to toggle the feature on or
off without having to remove the cable or modify the codeplug.
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Chapter 6 "Cabling Diagrams and Rear
4-19
September 9, 2011