User Manual

SGD-SB2025NT-TUM, Part 2
Jan 12 Page 62 SOLAR COMMISSIONING
The significant difference is that the page now contains ‘Main’ and ‘P25’ tabs, with the P25
features/parameters accessed via the P25 tab. The Main tab simply contains all the parameters
for an Analogue system, which are detailed in Section 5.4 above.
Figure 55. Channel Setup page (P25).
The ‘Eng’ button must be selected to enable changes to be made and the ‘Apply’ must be selected
to complete the changes.
5.5.1 Audio Mode
The channel’s Audio Mode is set here. This mode will be adopted by all NIs assigned to this
channel as long as they have their individual Audio Mode set to Remote. (See Section 5.2.1 -
Main Audio ). In Analogue or Auto mode, the channel bandwidth must be set to either 12.5 kHz or
25 kHz to match the setting in the SB2025 base stations and all the base stations must be set the
same.
5.5.2 P25 Channel Settings
The ‘P25 Channel Settings’ area is where the Tx and Rx Network Access Codes (NAC) are set.
The ‘Tx NAC’ and ‘TGID’ settings will be transmitted for all P25 calls originated by the dispatcher
and for all P25 T/T calls unless the Rx NAC is set to 0xF7F, in which case, the received NAC and
Talk Group Identification (TGID) will be transmitted.
If the ‘Rx NAC’ is set to 0xF7E or 0xF7F, the channel will respond to any P25 transmissions
irrespective of their own Tx NAC, however, if set to anything else, the received NAC must match or
the call will be ignored.