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Chapter 17

X.25

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Figure 17-1

X.25

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Figure 17-2

X.25 Layers in Relation to the OSI Layers

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Figure 17-3

Format of a Frame

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Figure 17-4

Addressing at the Frame Layer

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Figure 17-5

Three Phases of the

Frame Layer

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Figure 17-6

Frame Layer and Packet Layer Domains

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Figure 17-7

Virtual Circuits in X.25

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Figure 17-8

LCNs in X.25

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Figure 17-9

LCN Assignments

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Figure 17-10

PLP Packet Format

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Figure 17-11

Categories of PLP Packets

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Figure 17-12

Data Packets in the PLP Layer

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Figure 17-13

RR, RNR, and REJ Packets

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Figure 17-14

Other Control Packets

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Figure 17-15Control Packet Formats

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Figure 17-16

X.25 Address Format

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Figure 17-17

Triple-X Protocols