Ericsson LBI-39224 manual Channel Signaling

LBI-39224

Channel Signaling

This drop-down list box specifies the type of channel signaling sent out by the selected channel for control of external equipment such as an EDACS trunked site or co-located mux equipment. Valid settings are "NONE" for no signaling, "TONE" for tone control signaling, "E&M" for M-lead control signaling, and "BOTH" for both tone and M-lead control signaling. Channel Signaling default = "NONE."

EDACS trunked sites require specialized tone control signaling for transmit keying. For a CTIM, all utilized channels require either a "TONE" or a "BOTH" setting. Specific tone level settings are accomplished via the "Secure Tone" text box described in the following paragraph.

Secure Tone

This setting establishes the level of the 2175 Hz secure tone and transmit hold tone sent out by the Audio Board's channel prior to and during a switch-to-site transmission. The set level is only utilized if Channel Signaling is "TONE" or "BOTH." Valid range is -10 dBm to 11 dBm, which specifies the secure tone level. The 2175 Hz transmit hold tone is always sent out 30 dBm below the secure tone setting.

NOTE

The secure tone and transmit hold tone are set on a per Audio Board basis. For example, setting channel 2 equal to 5 dBm will simultaneously set channels 1, 3 and 4 equal to 5 dBm.

Bus/Slot Equipped

All utilized channels within an interface module must be allocated a time slot on the CEC/IMC TDM network. Allocate a time slot to the selected channel by setting Bus/Slot Equipped to "YES." A channel will not route audio correctly if is not allocated a time slot. Set all unused channels to "NO," (the default setting).

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