462.100

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garys
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462.100

#1 Post by garys » 31 Jan 2018 16:23

462.1000 DMR DCC: 8. Possibly All Comm WPMV418. Both slots active with commercial type traffic in the Boston area. Base licensed to One Financial Place, so my reception is a bit spotty.

TG 16777215 seems to only use Slot 1. Units are 5000 series, with mostly unit to unit private calls.
TG 17 seems to only use Slot 2.
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cdgordon
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#2 Post by cdgordon » 31 Jan 2018 18:37

16777215 - ALL SUBSCRIBERS

chris

garys
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#3 Post by garys » 31 Jan 2018 23:42

That's good to know.
cdgordon wrote:16777215 - ALL SUBSCRIBERS

chris
We're peace loving people, we're not hunting trouble, but if trouble should find us, we'll stand up and fight.

OceanNora
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Re: 462.100

#4 Post by OceanNora » 28 Mar 2018 12:09

Not to resurrect the thread, but 16777215 is Yellow Taxi/Suburban Coach in Revere. TG17 is a taxi service in the Chelsea/Everett/Revere area. Based on my rudimentary Spanish, it sounds like 17's car numbers are mostly in the 20s, so it's likely either C&M or Ventura Taxi.

cdgordon
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Re: 462.100

#5 Post by cdgordon » 28 Mar 2018 13:43

16777215 is a reserved ID and cannot be changed.

Here is info from a MotoTrbo powerpoint:
• All Call is a one way voice communication
between a privileged radio with other radio
users within the same logical channel.
• The transmitting radio uses a special All
Call group that enables every radio user
within the same logical channel,
(regardless of Group) to receive the
communication.
• This feature is particularly useful when a
supervisor needs to communicate to all
radios within the same logical channel
(frequency and timeslot) rather than
individual groups or users.

chris

garys
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Re: 462.100

#6 Post by garys » 28 Mar 2018 16:03

I don't think this is inconsistent with what Ocean Nora wrote, or what I've heard. 16777215 only appears on Slot 1, which is LCN 1. TG 17 only appears on Slot 2. That's the only activity I've heard on the frequency. Or at least on that frequency with that DCC. All of these business frequencies seem to have a lot of licensees.

cdgordon wrote:
28 Mar 2018 13:43
16777215 is a reserved ID and cannot be changed.

Here is info from a MotoTrbo powerpoint:
• All Call is a one way voice communication
between a privileged radio with other radio
users within the same logical channel.
• The transmitting radio uses a special All
Call group that enables every radio user
within the same logical channel,
(regardless of Group) to receive the
communication.
• This feature is particularly useful when a
supervisor needs to communicate to all
radios within the same logical channel
(frequency and timeslot) rather than
individual groups or users.

chris
We're peace loving people, we're not hunting trouble, but if trouble should find us, we'll stand up and fight.

cdgordon
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Posts: 1152
Joined: 29 Aug 2005 15:46
Location: Granby, CT

Re: 462.100

#7 Post by cdgordon » 28 Mar 2018 17:15

My post was meant to say that 16777215 is not assigned to the taxi company, it is a group with a special function. If you were to program in that TGID and expect to hear the taxi traffic, you would not always hear it. It would depend on how the system was programmed and used.

chris

garys
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Re: 462.100

#8 Post by garys » 28 Mar 2018 17:55

For whatever reason, it appears that taxi dispatch for the Yellow Cab is using that TG. At first I thought it was so that other units couldn't hear each other, but from what you are saying it's the exact opposite. Since it's tied to Slot 1, the other company isn't going to hear them since they are on Slot 2. At least that's how it seems. If there were multiple users on Slot 1, they'd all hear the Yellow Cab traffic, but there don't seem to be.

FWIW, I've seen that all call talk group used on other frequencies as well. Maybe it's just lazy programming.
cdgordon wrote:
28 Mar 2018 17:15
My post was meant to say that 16777215 is not assigned to the taxi company, it is a group with a special function. If you were to program in that TGID and expect to hear the taxi traffic, you would not always hear it. It would depend on how the system was programmed and used.

chris
We're peace loving people, we're not hunting trouble, but if trouble should find us, we'll stand up and fight.

OceanNora
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Joined: 05 Mar 2018 12:57

Re: 462.100

#9 Post by OceanNora » 29 Mar 2018 00:42

From my listening of the system, there does seem to be pretty significant use of private call, mostly from the cars to the base. My thought is that it's almost like an old style taxi system, where the drivers can hear the dispatch side but not the other drivers. On the slot 2 talkgroup, I haven't seen any private call use and it's 99% in Spanish. So far those two are the only users of the system, and I've been listening to it fairly extensively for the past two years as it seemed so odd.

garys
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Re: 462.100

#10 Post by garys » 22 May 2019 10:28

Doing some random listening this morning and came across this again.

Any thoughts on how to add this to the Taxi Cab Wiki Page?

My thought is that 16777215 is the dispatch side of Yellow Cab. The RID for that is always 5000. When units talk back in on the Private Call part, all of the units are 50xx, with the last two digits corresponding with the unit number. Radio 5000 and also talk to individual radios using Private Call. So, while all of the cabs on this part of the system can hear dispatch, they can not hear each other. So, it operates like a traditional cab radio system.

TG17 operates as we'd expect on a DMR system. We just need to confirm the user.
We're peace loving people, we're not hunting trouble, but if trouble should find us, we'll stand up and fight.

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