Packet Broadband Network Handbook by Haojin Wang

By Haojin Wang

The main entire booklet at the shelf a few relatives of applied sciences which are cornering the industry in improved telecommunications prone.

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After receiving an ATM cell, the ATM layer examines and strips the 5-byte header and passes the 48-byte payload to the layer above. The fixed length of ATM cells is motivated by two factors. First, the constant length makes the design of switching fabric hardware simple. Cell header (5 bytes) Figure 3-3 The ATM cell and cell header structure. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. ATM Networks 56 Part 1: Packet Network Foundations The variable length of packets such as IP packets requires buffering and more complicated processing than fixed-length cells.

If the address field extension (EA) bit, which is the first to be transmitted, is set to 0, it indicates that Figure 2-2 Frame relay frame structure. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. EA = 1 Frame Relay Networks Chapter 2: Frame Relay Networks 33 another byte of address field follows. If set to 1, it indicates the address byte is the last one. Currently all implementations use a 2-byte header, and thus the first EA bit always set to 0 and the second EA to 1, as shown in Fig.

2 Frame Relay SVCs Switched virtual circuits are temporary connections used for a particular communication session. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. 931 (ITU-T 1998). In general, a SVC session consists of four operation stages: Call setup. The virtual circuit is in the process of setup between a source and a destination DTE. Data transfer. Data transfer over the circuit between DTE devices is in process.

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