Failsoft

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KI4IHC

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About 30 minutes ago, for about 8 minutes, on Fairfax County's TRS, an announcement was made on all police dispatch channels (and I assume 4A - Fire dispatch) that the radio system would be entering a failsoft test, and to switch to certain channels for dispatch (all I caught was channel 1,3, and 7), keep radio traffic low, not to use tac channels, and that emergency buttons would not work.

I frantically tried to program the Fairfax County frequencies into my scanner to try to map frequencies to failsoft channels, but couldn't get them in fast enough.

A quick suggestion:

I have done this with Fairfax, and will make one for all other TRS's that I scan: For every trunked radio system you monitor, make another group with the actual frequencies, for if the radio system goes into failsoft mode, so you can still listen.

(In case someone does not know what failsoft is, here's a real basic description: When the computer running the trunked radio system fails, all the radios switch over to conventional operation, on pre-designated frequencies - it rarely happens)
 

freqhopping

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KI4IHC said:
A quick suggestion:

I have done this with Fairfax, and will make one for all other TRS's that I scan: For every trunked radio system you monitor, make another group with the actual frequencies, for if the radio system goes into failsoft mode, so you can still listen.

(In case someone does not know what failsoft is, here's a real basic description: When the computer running the trunked radio system fails, all the radios switch over to conventional operation, on pre-designated frequencies - it rarely happens)

I did just that a couple nights ago when Loudoun did a failsoft test since I only had the control channels programmed in my 396T. I identified the channels used by fire/rescue and the sheriff.
 

clbarker

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Lynchburg did that not to long ago too, but I'm not sure it was a planned thing because the radios were flippin' out. I couldn't figure out what was goin on because they said "Attention All Units, Change over to conventional frequency A". I guess it might have been the same failsoft operation.
 

John

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If it was FailSoft, then the user's in the field don't have to make any changes on their radios. They should automatically go to the preprogammed "failsoft" frequency for their selected trunking channel or system. In most cases there are different failsoft frequencies for each major agency (i.e. Police, Fire, Public Works, etc) so they can continue to operate with a minimum of interference with each other. However, they usually have several "talkgroups" from the same agency on the same failsoft frequency (i.e. Police channels 1 and 2 may end up on the same frequency when it is in failsoft) so they usually want field units to limit their traffic.

I don't know of any local systems here that do planned testing of failsoft.

I also know we have had our user's go to specific conventional repeater channels when there is trouble with the trunking system. This is not the same as failsoft. It basically abandons the trunking system completely. That may be what you heard.

John
 

K4APR

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John said:
If it was FailSoft, then the user's in the field don't have to make any changes on their radios. They should automatically go to the preprogammed "failsoft" frequency for their selected trunking channel or system. In most cases there are different failsoft frequencies for each major agency (i.e. Police, Fire, Public Works, etc) so they can continue to operate with a minimum of interference with each other. However, they usually have several "talkgroups" from the same agency on the same failsoft frequency (i.e. Police channels 1 and 2 may end up on the same frequency when it is in failsoft) so they usually want field units to limit their traffic.

I don't know of any local systems here that do planned testing of failsoft.

I also know we have had our user's go to specific conventional repeater channels when there is trouble with the trunking system. This is not the same as failsoft. It basically abandons the trunking system completely. That may be what you heard.

John

John, I'm not sure if GE/Eric Ma/Com does it this way. We do it that way in Motorola systems.
 

KI4IHC

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Just to update, around 0900 this morning Fairfax did another failsoft test. I was able to identify a few of the frequencies

FCPD:
Ch 1/8/9 - 853.4875 (I think)
Ch 2/6 - 855.9875
Ch 3/5 - 854.4625
Ch 4/7 - 852.9625

FCFD
4A/4B - 854.2875

Others:
Fairfax City PD Disp - 853.3375 (I think)
Unknown - 855.9625 - Just heard traffic on this frequencies, couldn't figure out what it was
Unknown - 854.2625 - Just heard traffic on this frequencies, couldn't figure out what it was
 
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