New version of Motorola Capacity Plus?

[thewraith2008]

I'm sure I read in one of them that Syscode is fixed in Advantage mode for each model (Tiny, Small, Large, Huge).
I'll see if I can find reference again.

MOTOTRBO Radio Management 2.0 User Guide (page 726-727) - see notice at bottom of text.
It should be noted that this snippet alone maybe out of context.

https://imgur.com/gB4NFC7

 

[EricCottrell]

In your post 13, you had the FID as 7 bits and LCN as 13 bits.
I realized it was a typo on your part and I just pointed it out for anyone who's following.

Sorry, I got confused. Thanks for the correction.

I tried searching for the Motorola documentation on Capacity Max previously and could not find anything easily. Now that I have some actual titles I can do better searching.

Good to know there are three flavors of CapacityMax. It also explains why I see voice traffic on frequencies other than the control channel unless there is just one frequency at a site. Slot 2 of the control channel frequency also carries Aloha messages instead of being idle.

73 Eric

 

[thewraith2008]

Not sure if a PDU exists that helps to distinguish these modes of operation or if it's just hard coded to be that mode.

On my CapacityMAX (Open System?), I see ALOHA's being sent interleaved with the FIDs of 0 and 16.
Do you still see that with the CapacityMAX (Advantage?) your looking at?

 

[EricCottrell]

I found some up-to-date Capacity Max documentation. It is interesting reading.

There are two major configuration types, a 250 site system and a 750 site system. Most of the differences relate to internal IP network configuration. Motorola recommends dividing a 750 site system into three regions - Region 1 is Sites 1 to 250, Region 2 is Sites 301 to 550, and Region 3 is Sites 601 to 850.

There is mention of three system types:

• Capacity Max Open Radio only applies to radios. It is a Motorola radio operating on another manufacturer's DMR system. This is the only type where Location Area Length can be configured.
• Capacity Max Open System is for a mix of Motorola and non-Motorola radios.
• Capacity Max Advantage is for Motorola radios only.

The Talkgroup and Radio ID ranges follow the DMR Specifications.

There are special cases for systems using talkgroups in the range of 1 to 3FC (Hex):

• The proprietary messages for the various Priority Monitor features are optimized.
• The proprietary talkgroup call late entry (documented in this thread) is only used in Advantage Mode.

So the only way to determine a Open System versus Advantage is when talkgroups 1 to 3FC (Hex) are used.

There can be up to four control channels per site. This seems to be the specification used on a lot of Motorola TRS types.

Channel plans (i.e. LCN)
Channel numbers are 1 - 4094. It does not support the direct frequency mode (4095) in the DMR specifications.
It is possible to have RF sites on different frequency bands, but radios only have one channel plan and all the sites the radio uses must have the same plan.

Fixed mapping of frequencies follows the well known formula [Frequency = Base + ((Channel - Start Channel)*Step)].
There can be up to four ranges. The advantage is adding sites does not require reprogramming of radios.

Mapping for all 800 MHz and 900 MHz frequencies

Segment 1   Base 851.0000 Start Channel    1 Step 0.0125 MHz
Segment 2   Base 935.0000 Start Channel 1441 Step 0.0125 MHz

UHF Note that T-Band needs another segment because of the different split (3 MHz vs 5 MHz).

Segment 1   Base 450.0000 Start Channel    1 Step 0.0125 MHz  Regular UHF
Segment 2   Base 470.0000 Start Channel 1201 Step 0.0125 MHz  Lower part of T-Band (This would cover Boston at 470 and 482 MHz frequencies but not Philly at 500 and 506 MHz).

Flexible mapping assigns a frequency pair to a channel number. It is possible to use both fixed and flexible together. UHF systems could use the channels in the 455 - 459.9875 MHz range for flexible frequencies instead.

There is capability for new site announcement so radios do not have to be reprogrammed. Motorola recommends using this for Fixed Channel Plans only

73 Eric