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56K Modem Troubleshooting Guide


Brief Table of Contents

Initial Connect Speed Issues

Interoperability: V.34, x2, K56flex 1.0 and 1.1, and V.90

Known Problems with Specific Modems

Disconnects

Troubleshooting Links


Detailed Table of Contents

Initial Connect Speed Issues

Help! My 56K modem connects at 33.6 or less!

Even if I don't connect at 56K, I'm guaranteed 33.6, right?

I'm connecting at 38400, 57600, or 115200. Or am I?

How can I get my modem to report the true connect speed?

What are typical connect speeds for 56K modems?

Is initial connect speed all it's cracked up to be?

What's the command for connection speed and stats on my K56flex?

What's the command for connection speed and stats on my USR?

What's a good way to test actual modem performance? (FTP)

Interoperability: V.34, x2, K56flex 1.0 and 1.1

33.6 or less when dialing a Livingston Portmaster K56flex

Connect problems or slow connects when dialing a 28.8/33.6 modem

How can I enable or disable x2 and/or V.90?

How can I enable or disable K56flex and/or V.90?

Known Problems with Specific Modems

USR Sportsters get slower and slower, or experience long pauses, or disconnect

USR Modem Update Wizard crashes or won't work

"BLOCK ERASE ERROR 27" while flashing Courier ROMs

Poor connects with fixed-datapump K56flex units.

Poor connects with 1.00x K56flex firmware

Poor connects with early Lucent LT Winmodem firmware

Disconnects

U.S Robotics Sportster gets slower and slower, experiences long pauses in which no data is sent, or disconnects suddenly

Lucent LT Win Modem disconnects

Macintosh issues

A checklist for troubleshooting disconnect problems

Upgrade firmware, init strings, and drivers

Try unplugging any devices from the back of the modem

Try unplugging other telephone equipment in the house

Try lowering the port speed

Lowering connect speed with K56flex or K56flex/V.90 modems

"I want call waiting to disconnect me when I have an incoming call, but it doesn't."

Troubleshooting Links

Are there any 56K test lines I can call?

Are there any other 56K troubleshooting pages?

Any help for determining line noise?

Any help for ISPs?

OK, but where can I get some real answers?




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