Managing a serial link in an input/output system which indicates

Details Managing a serial link in an input/output system which indicates Managing a serial link in an input/output system which indicates

1990-08-31

1992-09-29

Shaw, Dale M.

Boots, shoes, and leggings

36424295, 3642601, 3642651, 3642655, 364266, 3642646, 3649263, 3649404, H04L 700, G06F 304, G06F 1516, G06F 1120

Patent

active

051519771

ABSTRACT:
A link-level facility for managing the transmission of frames and continuous sequences of control characters over a link. The link-level facility includes a state machine which has a first state for allowing transmission of a frame over the link where a link-level facility at the other end of the link indicates that the link has a frame-transmitting status, and a second state for preventing the transmission of frames over the link when the link-level facility at the other end of the link has indicated that the link has a non-frame-transmitting status. The link-level facilitates signal the status of the link by means of continuous sequences of special characters intermediate frames transmitted over the link such that synchronism is maintained. The first state includes an inactive state and a working state, and the second state includes a link-failure state, and connection-recovery state and an off-line state.

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IBM Technical Disclosure Bulletin, vol. 32, No. 10A, Mar. 1990, pp. 333-334, Combining Control Information with Data to Insure Accurate Data Transmission and Reception Across an Asynchronous Channel Interface.

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