US ROBOTICS COURIER

Manufacturer: U.S. Robotics
Model: Courier
Latest Firmware Revision Tried: Supervisor 08/26/94 DSP 08/24/94
Recommended Firmware Revisions: Supervisor 08/26/94 DSP 08/24/94
Last Updated: Date: 1998/10/12 20:47:51 $

  Firmware revisions numbers appear to be meaningless; only the date stamps are useful.
  The first modem to be shipped with Class 2.0 support.

CLASS 1 SUPPORT

- When sending DCD is raised when carrier is first received, but it is then dropped from the first HDLC receive until the point where the initial training is sent (from that point on DCD is asserted); this can be a problem because there is no way to override this behaviour which means that the host must be capable of ignoring DCD for sending to function correctly

CLASS 2.0 SUPPORT

- Previous Supervisor firmware revs were known to function incorrectly; in particular, rev 5.1 (12/10/93)
- Certain firmware revisions incorrectly interpret the signalling rate session parameter in +FIS and +FCC commands; this causes the modem to attempt to negotiate session communication at 2400 bps
- RTS/CTS flow control does not work.
- Line counts returned in `+FPS:` status strings are wrong.
- The modem indicates it supports copy quality checking of received data, but it does not.

Modem Index US Robotics Sportster