Configuring | 23 |
■Modem must have an
■Modem’s serial port rate must support 115.2 Kbps
■Modem’s serial port must be configurable to support hardware flow control
If your modem meets these minimum requirements, it may be used with the TMX cable modem, but please remember that the quality of your external analog modem directly effects the performance of your cable connection.
In addition to meeting the basic requirements, your analog modem may need to be configured to work properly with the TMX cable modem. The included configuration software provides a "Cable Modem Configuration" screen which can be used to pass additional parameters to your analog modem. These parameters are AT command strings used during initialization. Since the parameters are often manufacturer specific, list below is the optimal configuration. The characters in brackets are the equivalent 3Com U.S. Robotics modem commands. Please refer to your analog modem's user manual for the exact AT commands. It is not necessary to enter AT into the parameter field, only the command parameter.
■Return result codes in words [V]
■Serial port rate higher than connect rate [&B1]
■Transmit data Hardware flow control [&H1]
■Receive data Hardware flow control [&R2]
■Auto enable V.42 Error correction [&M4]
■Auto enable V.42bis data compression [&K1]
■
■Carrier Detect follows connection (&C1)
For example, in order to program your analog modem as described by these commands, you would enter the following string into the "Use User Initial" field on the "Cable Modem Configuration" screen:
V&B1&H1&R2&M4&K1B0&C1
Since the quality of analog modems and telephone lines varies greatly, in most cases V.42 error correction and V.42bis data compression should be used. In other