art@ACC.ARPA (11/19/85)
> What application is 1822 HDH intended for? Is it a reasonable > cheap alternative to standard 1822? 1822 HDH stands for HDLC HOST. This is a Host/IMP interface which uses a synchronous communication protocol. HDH uses HDLC LAPB with a protocol layered on top to emulate the direct connect interface. HDH is intended for use when the Host is more than 2000 ft from the IMP (Distant Host limit). Whereas the direct connect interfaces are capable of running several hundred KB/s, HDH is limited to about 76.8KB/s. Since most synchronous modems operate in the 9600 to 56KB/s range, HDH is acceptable in those applications. "Art Berggreen"<Art@ACC.ARPA> ------