Lockup prevention method and apparatus

Details Lockup prevention method and apparatus Lockup prevention method and apparatus

1990-05-01

1992-04-21

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375121, 379 98, 371 34, H04L 2710, H04L 114

Patent

active

051075180

ABSTRACT:
Lockup in escaped mode for asynchronous paired modems on a communications link utilizing DTE echo back verification protocol is prevented by adding logic to each modem to detect and suppress transmission by the modem to its paired modem of at least one of any escape sequence characters received by a modem from its attached DTE. This prevents the unintentional placement of the paired modem, which would otherwise be transmitting echoed back characters from its DTE, from entering into the escape mode of operation due to what it would recognize as "escape sequence" characters received as "echo back" verification from its DTE.

REFERENCES:
patent: 4271513 (1981-06-01), Maejima et al.
patent: 4440988 (1984-04-01), Heatherington
patent: 4675862 (1987-06-01), Banzi, Jr. et al.

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