Microsoft KB Archive/143278

= Microsoft Knowledge Base =

28,800 bps Modem May Connect to MSN at Slower Speed
Last reviewed: October 7, 1997

Article ID: Q143278

The information in this article applies to:


 * The Microsoft Network versions 1.0, 1.05, 1.2, 1.3, 2.0, 2.5

SYMPTOMS
When you connect to MSN, The Microsoft Network, using a 28,800 bps modem and a 28,800 bps access number, you may be connected to MSN at a speed lower than 28,800 bps.

CAUSE
Depending on the access number, your modem may actually connect at 28,800 bps, 26,400 bps, or 24,000 bps. We have adjusted the connection speed for some Internet access phone numbers to ensure a stable connection.

STATUS
We expect this adjustment to be temporary. We are working on other ways to improve connection stability.

MORE INFORMATION
This issue arises because of the V.34 and V.42 standards used by various modems. Your modem may establish a 28,800 bps connection but fail to negotiate V.42 compression. This leads to the inability to connect, slow throughput, and dropped sessions. A modem that fails to negotiate V.42 compression at 28,800 bps may successfully negotiate V.42 compression at lower speeds (such as 26,400 bps or 24,000 bps). The speed can vary depending on the local phone company and phone line conditions.