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stable rate fallen, but why??

winnipeg1823
Grafter
Posts: 156
Registered: 08-08-2007

stable rate fallen, but why??

I am not one of these people who want really high speeds, and because of line length could'nt get them anyway.

synch on my router is always between 1150 and 1300.

Apart from a blip shorly after the 10 period after being maxed, my stable rate has been 1000, with download speeds of between 850 and 1000.

However my stable rate has now been dropped to 500, with speeds of around 450.

My router shows no loss of synch,no disconnections, no synch below 1150, so why the drop
4 REPLIES
Plusnet Staff
Plusnet Staff
Posts: 12,169
Thanks: 18
Fixes: 1
Registered: 04-04-2007

stable rate fallen, but why??

Hi,

Looking at the speed history from BT it looks like they applied a change from 500 to 1000kbps on 4:44am and at 6:21am it went back down to 500kbps.

I think the reason may be that it has/is sync'ing just below the 1Mbps rate, for a 1Mbps throughput it needs to sync at or above 1152kbps. 1150kbps is just enough for it to drop the throughput down to 500kbps.

If the line can sync at or above 1152kbps for 3-5 days then there shouldn't be a problem with it increasing the throughput back to 1000, but if it it's below, even just by 2kbps it will stay at 500kbps.

May be worth double checking all the wiring and filters, also trying the modem at the master socket, it probably doesn't need much of an improvement to increase the sync speed a little and be stable at 1Mbps.
winnipeg1823
Grafter
Posts: 156
Registered: 08-08-2007

stable rate fallen, but why??

thanks for the reply, what dates were the requests made? as you can see below the speeds are pretty consistent over the week, so the line will obviously stand the 1000 profile

13-10-2006 18:37:36 954.6
12-10-2006 20:35:14 847.7
12-10-2006 18:05:23 924.5
11-10-2006 16:53:47 884.6
11-10-2006 16:50:49 636.1
11-10-2006 16:50:26 851.9
10-10-2006 18:33:00 963
10-10-2006 16:12:56 960.3
10-10-2006 16:10:16 786.7
10-10-2006 16:09:36 842.6
09-10-2006 16:03:27 958.9
08-10-2006 20:06:05 1000.3
08-10-2006 14:17:03 962
08-10-2006 12:32:56 965
07-10-2006 09:41:19 952.3
winnipeg1823
Grafter
Posts: 156
Registered: 08-08-2007

stable rate fallen, but why??

In addition to the above, am I right in thinking that although ONE dip in synch leads to a drop in stable rate, why then doesnt one rise in synch lead to a rise in the stable rate.
I could plug the router into the test socket, synch at 3000+ on one occasion, then have a high stable rate for several weeks.
surely whats good one way, should be good the other way as well, OR is it a ploy to stop us all downloading lots?Huh
N/A

stable rate fallen, but why??

I believe one or more “faults” detected on the line in any 24hrs period will result in the BT WS DLM (Dynamic Line Management) software reducing your Line Rate until NO faults are seen.. It will monitor over the next 3 days to see if you have NO faults within that time.. at which time (if no fault is seen) it will increase your speed again to the MSR (Max Stable Rate)

It should be noted that a “Fault” (in all sense of the purpose of the word).. May NOT actually be a “Fault” with your Broadband.. It could be anything from EMI (electro magnetic interference) to an extension installed in your home ..

The basic principal is to eliminate the internal setup from being the problem.. Internal wiring.. EMI, Hardware and so on… After checking all of this you should maybe ask some neighbours if they are having problems…. if they are then it could be a fault with exchange equipment.

As you suggested .. your line length may also be a problem.

Mal