Multiplex communications – Wide area network – Packet switching
Patent
1991-08-19
1994-05-03
Harrell, Robert B.
Multiplex communications
Wide area network
Packet switching
395325, 395500, 370 941, 364DIG1, 3642409, 364DIG2, 36494081, 375 8, G06F 1342, G06F 1314, H04L 700
Patent
active
053095626
ABSTRACT:
A method for establishing a spoofing service for a high-level file transfer protocol from a modem. A modem spoofing initiation protocol (MSIP) word containing modem limitations is appended to the initial negotiation frame sent by the host to the receiver. If the receiving modem detects the MSIP word at the end of the negotiation frame, it compares its own limits with the received limits, takes the lower limit as the agreement, then appends the agreement word to the frame sent to acknowledge the negotiation frame. If the sending modem detects the agreement word, both modems use the agreed limits to examine the maximum block size and window size in the negotiation frame of the high-level file transfer protocol. If the block size and window size are within the agreed values, the spoofing service begins.
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Harrell Robert B.
Multi-Tech Systems, Inc.
Philipp Timothy L.
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