Frame Format

Token Ring and IEEE 802.5 support two basic frame types: tokens and data/command frames. Tokens are 3 bytes in length and consist of a start delimiter, an access control byte, and an end delimiter (see Figure 6-4). Data/command frames vary in size, depending on the size of the Information field, where the data is carried. Data frames carry information for upper-layer protocols, whereas command frames contain control information and have no data for upper-layer protocols.

Figure 6-4. Token Frame

Figure 6-4. Token Frame

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