Connect speed dropped?

[KahmSahmNeeDah]

My connect connect speed has dropped from 48K to 28K for some reason.

Same modem and settings. Any ideas on what to check?

Thanks.

 

[VanguardLH]

in message

My connect connect speed has dropped from 48K to 28K for some
reason.
Same modem and settings. Any ideas on what to check?

Presumably for those low speeds you are talking about a dial-up
connection but failed to mention that.

Could be you are now getting connected to the same modem in your ISP's
modem pool and there is a problem with that modem or the network
appliances in the path to it. Could be the modem to which you connect
to at the other end doesn't support the protocol that yours does for
the faster speed. Sometimes they upgrade their modem pool but that
means there is a mix of modems and some might not support the
protocols for the higher speeds. Report it to your ISP. They'll have
to fix their modem provided they can narrow down which one it is.

Could be there is more noise on your telephone line. Noise interferes
with data transmission which can cause retries on packets to get
resent. These resends of lost packets cause delay which reduce the
effect transfer rate. You could try running "ping -n 100
www.yahoo.com" to see what percent of packets are getting lost.
Anything over 4% should get reported to your ISP but they probably
cannot do anything about noise on the lines provided by your telco
(and bitching to the telco won't help because they only guarantee
quality for voice transmission, not for data transmission).

Could be you are in an apartment and the distro box for the telco has
a component that become defective or degraded, or the apartment
complex ran your telephone line through non-telco equipment, like a
doorbell system that rings your phone when someone presses your
doorbell button on the matrix panel in the lobby.

When was the last time you rebooted (to power cycle the modem if it is
an internal card or controller)? Modems handshake to establish a
session but may not acquire the requested speed or they negotiate
downward in speed as errors are encountered during a connection
session. I have seen some modems that get "confused" and won't start
handshaking at the highest speed until they get power cycled (mostly
for the "modems" that use DSP chips that suck up more CPU cycles which
is pretty much most of them now).

Hard to say without knowing your particular hardware setup to know the
cause. Start with your ISP to query on the reduction of your
effective transfer rate assuming they even guarantee a minimum rate.

 

[Ken Blake, MVP]

My connect connect speed has dropped from 48K to 28K for some reason.

Same modem and settings. Any ideas on what to check?

A dial-up modem?

his is usually a function of your local telephone line, and the noise
that's on it. There is usually little or nothing that you can do about
it locally. When I last used a dial-up modem (56K), despite all my
efforts, I never got above 28.8, and usually only 26.4. Sometimes it
wasn't even that good.

You can try calling your local telephone company and asking them to
troubleshoot the line, but be prepared for the possibility that they
will tell you is that all they promise is voice service on a
voice-grade line.

 

[Poprivet]

in message

quality for voice transmission, not for data transmission).

Not necessarily so. IF there is any static or pips and clicks on the
telephone line, they have to fix it. Call them up if you have noise and ask
them to check the lines; they can do much of it right there while you're on
the phone. "Voice Quality" is quiet and devoid of audible noises.
Make certain the noise isn't coming from anything in your house FIRST
because if you allow them entry to your home, they will charge you for the
service call. They are only resopnsible for the wiring up TO your
interconnection box, called Demarc, NID, etc.. After that connection point
you own it so they charge to test it inside.

HTH

Pop`