December 2001
Intermediate to advanced
656 pages
27h 19m
English
Content preview from Networking Explained, 2nd Edition
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380 Networking Explained, Second Edition
Control—Provides layer-2 control information (e.g., specifies the type of frame
being transmitted, maintains frame sequence numbers).
Information—Provides layer-3 protocol information and user data. The protocol
discriminator (PD) identifies the specific layer 3 protocol. The length (L) byte spec-
ifies the length of the CRV field, which is either one or two bytes. The call reference
value (CRV) is the number assigned to each call. Once a call is completed, this
number can be reassigned to a new call. Message type (MT) identifies specific
messages related to circuit-switched connections. For example, during call-setup, ...
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