Talk:MPT-1327

More than one channel

Systems based on MPT 1327 always require two or more radio channels per site.

Incorrect, the system that I worked on used all single channel sites in this area because of low traffic levels. We only had one with more than one channel and they were on different networks so still single channel. --jmb 00:01, 4 September 2007 (UTC)

In a single channel system the Control Channel operates as Shared Control Channel, switching to being a Traffic Channel for the duration of the call. Not sure whether this can or does happen in some multi-channel sites.

If all channels are occupied, the call will be queued - unless the call is a priority one, in which case the call can be terminated. --jmb 23:04, 19 September 2007 (UTC)

Agreed! It is also possible (see below) to have multiple control channels on a site, see LAB Field in MPT1327. --TiredAndConfused (talk) 10:44, 30 September 2011 (UTC)

MPT1327 can have shared control/voice channels it can also have multiple control channels on the same site to either load share control channel signaling traffic or separate SDM short data message traffic and EDM Extended data message traffic. Two or more channels (1 control plus voice channels) is most common but not compulsory. If a control channel fails, site voice channels can be used as a control channel providing the site channel controller can support the detection of base alarms to make that choice. —Preceding unsigned comment added by 60.241.102.122 (talk) 09:27, 18 October 2010 (UTC)

Agreed, although swapping out CCH frequencies on a site for a Traffic Channel means that mobiles need to either have that frequency added to their hunt pattern (slowing it down) or they would need to do a Comprehensive Hunt to acquire the new frequency. Best to have a traffic channel transceiver change frequency (modern kit will do this) to the old CCH frequency and lock its old channel out of the available channel list for that site. --TiredAndConfused (talk) 10:44, 30 September 2011 (UTC)

Also Note Multiax is not a variant of MPT1327/MPT1343 Multiax operates on CTCSS (Continuous Tone Coded Squelch System) to separate operational groups and does not comply with these standards. It is a multi group multi access system which can also be multi site. It supports fewer fleets or groups than MPT1327/1343 but can have lower infrastructure costs than MPT1327/1343. Agreed: --TiredAndConfused (talk) 10:44, 30 September 2011 (UTC)

6.25 kHz channels

I have found reference to MPT-1327 and 6.25kHz channels twice in this article. I know of no MPT being sold or advertised as 6.25. — Preceding unsigned comment added by 75.100.112.38 (talk) 19:10, 2 August 2012 (UTC)