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CEA-600.37
- Complete Document
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Revision / Edition: 97
Chg:
Date: 11/00/97
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SYMBOL-ENCODING SUBLAYER
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Document may be cross-referenced, superseded or canceled
(See Comments and Superseding Document below) |
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Comments:
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ANSI APPROVED * W/D NO S/S
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Superseding Document:
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Page Count:
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27
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In Stock:
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Yes
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Hardcopy Price:
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$ 30.00 |
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| Download Price: |
$ 30.00 |
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| Document Abstract |
Introduction
This document describes the portion of the Node Physical Layer
that interfaces to the Medium Access Control (MAC) Sublayer and to
Layer System Management (LSM). This sublayer is called the Symbol
Encoding (SE) Sublayer. The SE Sublayer provides two primary
functions:
Accepts symbol transmission requests (PH_CC_DATA.request service
primitive) from the MAC Sublayer, converts the symbols into correct
medium state change timing, and produces requests (M_STATE.request)
for state changes on the physical medium. This function is symbol
encoding.
Accepts state change indications (M_STATE.indication service
primitive) from the Control Channel Medium Dependent Physical (MDP)
Sublayer, converts the time between state changes to symbols, and
produces indications of symbol reception (PH_CC_DATA.indication)
for the MAC Sublayer. This function is symbol decoding.
Figure 1-1 illustrates the lower part of the CEBus layered model
with the section described by this document shaded. Shown to the
left of each sublayer is the document number covering that
sublayer. Between the sublayers are the service primitives that
exchange information and interact with the internal state machines.
Within each sublayer block is the basic unit of information handled
by that sublayer. The bottom block represents the Control Channel
MDP Sublayer.
This Symbol Encoding Sublayer operates in conjunction with MAC
Sublayers that perform error detection. This Sublayer supports
Twisted Pair, Coax, and IR media, and possibly others in the
future. Other Symbol Encoding Sublayers are defined that perform
their own error detection for the MAC Sublayer.
The next section provides a functional description of the SE
Sublayer. Sections 3 and 4 detail the service primitives supported
by this sublayer. Section 5 provides a prose description of the
states, events, variables, and actions found in the SE state
machine. Section 6 presents the state transition tables (state
machine).
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