Does Telecom use ACCLOC?[Sanyo 8100]

Forums › Mobile handsets › Does Telecom use ACCLOC?[Sanyo 8100]

Torque

379 posts

Ultimate Geek

#2650 31-Oct-2004 18:59

I cannot remember exactly what the acronym is, it may not be "ACCLOC" as such, but it referes to a setting on the Sanyo 8100 phones (NZ default is either 7 or 9), which in the US is used as a priority code if the celltower is overloaded/busy - the higher the accloc code, the higher your cellphones priority at the tower - is this enabled in NZ with Telecom?

1 | 2

590 posts

Ultimate Geek

Lifetime subscriber

#9735 1-Nov-2004 09:43

I think you're referring to the Access Overload Class. In New Zealand (and most of the world AFAIK) it's default is the last digit of your cellphone number. 0 - 9.

It's set as part of the standard programming for the handset, and isn't an option that I've ever seen changeable through the phones menu.

Jp.

Working for Service Plus - www.serviceplus.co.nz

Authorised Service Agent for Apple, BenQ, Sony, and Toshiba - warranty & non-warranty repairs.

Torque

379 posts

Ultimate Geek

#9750 1-Nov-2004 15:54

On the Sanyo 8100, it is a programmable option, but only if you have the SPC for the phone.
(In the US, I think its illegal to set it above a certain level, as some levels are restricted for Government employees etc.)

What I was wanting to know, is if telecom has it enabled?

jpwise

590 posts

Ultimate Geek

Lifetime subscriber

#9751 1-Nov-2004 16:08

As far as I'm aware it is. But you probably wouldn't be able to tell unless the network overloads for some reason or you try to make a call during New Years festivities in the middle of town etc.

Working for Service Plus - www.serviceplus.co.nz

Authorised Service Agent for Apple, BenQ, Sony, and Toshiba - warranty & non-warranty repairs.

paradoxsm

3000 posts

Uber Geek

Trusted

#9765 1-Nov-2004 21:09

You'd never push CDMA in NZ to "overload".
It's capacity is just too high to overload with our small userbase.

I seem to think it's something to do with AMPS, the old analogue system.

Most CDMA phones are technically capable of full AMPS (025) however this has been disabled at firmware level by telecom for obvious reasons.

(call *22801 from a 2280 for example jumps into AMPS mode and calls some number. You hear the AMPS error message and it will tell your "programming failed" but is harmless..)

cellman

149 posts

Master Geek
Inactive user

#9942 5-Nov-2004 15:17

Access overload Class is used to stagger all the phones on the network to talk to the network at diffrent times,(IMicroseconds) this stops all the devices all try to say something at the same time and overloading the network ,, it is a way to load share the communiction.

All CDMA has the ablility to work on a AMPS network (NOT TDMA). As Telecom is going to turn off there network in the Futuer and it was decided there was not pont have CDMA working on a AMPS network as the coverage is pretty much the same, and CDMA has heaps of capacity. The AMPS feature has been disabled in the the Phones hidden setting and Also the AMPS network is not Listed in the Phones Roaming list

tonyhughes

Hawkes Bay
8476 posts

Uber Geek

Retired Mod

Trusted

Lifetime subscriber

#9959 5-Nov-2004 21:16

Out of pure interest for those who care, the overload class was something that a rep/telecom would set manually on an 025 phone at the time of sale.

It doesnt get touched these days once it leaves the supplier in Auckland (if at all)

sbiddle

30853 posts

Uber Geek

Retired Mod

Trusted

Biddle Corp

Lifetime subscriber

#9992 6-Nov-2004 17:33

-You'd never push CDMA in NZ to "overload".
-It's capacity is just too high to overload with our small userbase.

There isn't such a thing on CDMA as network congestion las you know it like that on a GSM or AMPS/TDMA network as there isn't a physical limit to the number of calls available. On CDMA the SN ratio increases higher and higher as the number of calls on a site increases which means you could be dropped if your phone can't increase it's transmit power (ie you are in a fringe coverage area). Once the SN radio gets too high CDMA dumps EVERY call on the site, something we probably won't see in NZ at the moment but common in the US at large sporting events etc.

Equinox IT

Cloud spending continues to surge globally, but most organisations haven’t made the changes necessary to maximise the value and cost-efficiency benefits of their cloud investments. Download the whitepaper From Overspend to Advantage now.

alasta

6703 posts

Uber Geek

Trusted

Subscriber

#9993 6-Nov-2004 18:01

I have heard someone explain this before and I can remember being surprised that networks do not impose hard constraints on the number of calls that any single transmitter can take, in order to prevent this situation from arising.

I'd prefer for my call to be unable to proceed, rather than make the call and run the risk of having it dropped.

sbiddle

30853 posts

Uber Geek

Retired Mod

Trusted

Biddle Corp

Lifetime subscriber

#9994 6-Nov-2004 20:53

I think the best way of describing how CDMA works is to compare it to people talking in a room. CDMA uses the same frequency on every cellsite and the total capacity available is limited by the bandwidth available. Because you don't have to deal with frequency reuse like a AMPS/DAMPS/GSM network it can be a lot easier to plan and build the network. GSM/AMPS/DAMPS have set frequencies for each site and each call either uses one of those frequency pairs or a timeslot of that frequency pair for a GSM/DAMPS call.

If there were 10 of people in a room using GSM or DAMPS and 5 of those people decided to talk to the other 5 those 5 pairs would all require their own frequency or timeslot. Assuming there are only 20 frequencies available you could manage 20 calls on AMPS or around 100 (round figure) or so calls on a GSM or DAMPS network. Any new people coming into the room would be incapable of having a conversation if they exceeded those limits.

CDMA uses the same frequency and is a bit like everybody in the room talking at exactly the same talks but the network knows who you are talking to. As more people come into the room everybody has to shout a little bit louder to be heard, eventually you can't talk any louder so everything just gets jumbled - which is exactly what happens with CDMA. There is no real way of imposing a physical limit to the number of calls because it's a theoretical limit and not physical one.

alasta

6703 posts

Uber Geek

Trusted

Subscriber

#9995 6-Nov-2004 21:42

My point was that you could impose an arbitrary limit to avoid the risk of the network reaching capacity. Sure, this might cause some inefficiency, but I think the benefits would outweight the costs.

To use your analogy, the door of the room would be locked once a certain number of people were present in the room to prevent too many people from being in the room.

cellman

149 posts

Master Geek
Inactive user

#9997 6-Nov-2004 22:42

Telecom Has set the Limit a calls that can be set up on a Sandard cellsite to about 36 calls at once. This is Due to there being a Limit on the 2mbit E1 that feeds these cells. Which is the bottleneck. Telecom network can only handle about 1 million calls at once. They use a fomula that states the odds of everybody wanting to place a call at the same time is very unlikely.

paradoxsm

3000 posts

Uber Geek

Trusted

#9998 6-Nov-2004 22:58

64k per call, sheesh. Talk about overengineering. the phones themselves use 9600 (025) and about 4000 (027)

paradoxsm

3000 posts

Uber Geek

Trusted

#10002 7-Nov-2004 02:45

Something just struck me. How does data work if there is only a pathetic 2Mbit pipe?

Especially for the new EVDO which has just been launched. sureley they have more calls on each site to. Even with all the micro's in downtown auckland, 32 calls is per site is not much.

cellman

149 posts

Master Geek
Inactive user

#10005 7-Nov-2004 09:25

the way amps works is that each chaqnnel has a 64K timslot on the 2 meg pipe so the capicity is 30 calls + 1 sync slot and 1 signalling slot. = 32. 32 Slots x64k = 2Meg .. CDMA loaD shares across the slots. So Voice and Data is loaded shared
8K For Vioce
Upto 153 K for 1x
Upto 2M for EVDO

So it depends on what service is being used on the Cell which will determine how many Calls on any type can be connected at once.
However Voice Calls have priority over Data so the more voice calls on a cell the slower the data connection

sbiddle

30853 posts

Uber Geek

Retired Mod

Trusted

Biddle Corp

Lifetime subscriber

#10008 7-Nov-2004 09:41

Hence Telecom's desire to get rid of AMPS and DAMPS phones since they are effectively bandwidth leeches! :-)

Can anybody confirm that Telecom are infact removing gear from some existing sites already and making them CDMA only? I know all new sites are CDMA only but had heard Telecom were upgrading some existing sites and removing the old gear. Somebody I know was also complaining the other day their 025 phone didn't work in a couple of places any more which also made me suspect it was infact happening.

1 | 2