Issue 1a - 10/99
8-9
Introduction to Frame Relay
LAPD was originally developed to convey signalling
information between the elements of an ISDN network.
Signalling, however, does not use all the available bandwidth
thus freeing up the remainder for the transmission of user
data.
Frame Relay uses the capabilities of the LAPD protocol for
the transmission of all the data.
The following diagram shows a typical Frame Relay frame:
•
The flag indicates the beginning and end of a frame.
•
The FCS (Frame Check Sequence) is used to ensure
frame integrity.
•
The information field contains the user data which
is to be passed between devices over the Frame
Relay network. This field is of variable length - in
theory it can be up to 8192 bytes in length; in
practice the maximum is vendor specific.
•
The header contains addressing and congestion
control information. The header may contain 2, 3
or 4 bytes.
The structure of the header is shown in the following
diagrams:
2 Byte Header
Summary of Contents for auroraTempo
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Page 35: ...Issue 1a 10 99 3 3 Getting Started Connecting auroraTempo within the Frame Relay Network ...
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Page 56: ...auroraTempo User Guide 4 8 423972 The following table provides a key to the T1 display ...
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Page 197: ...Issue 1a 10 99 6 19 Configuring auroraTempo ...
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Page 242: ...auroraTempo User Guide A1 6 423972 34 Way MRAC Winchester Connector Male Part number 423355 ...
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Page 262: ...auroraTempo User Guide A3 2 423972 Appendix 3 Menutrees Main Menu Menutree ...
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Page 267: ...Issue 1a 10 99 A4 1 Appendix 4 Glossary Appendix 4 Contents Glossary A4 2 ...
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Page 285: ...Issue 1a 10 99 Index 1 Index ...