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<h1><font color="#008000" size="4">Frame Relay Overview</font></h1>
<p><font color="#008000"><b>Frame Relay</b></font></p>
<p>Frame Relay is a network access protocol similar in principle to X.25 (a protocol is a set of procedures or rules that govern the transfer of information between devices).
The main difference between Frame Relay and X.25 is data integrity (error detection) and network error flow control (error correction). <br>
<br>
X.25 does all of its data checking and correcting at the network level. That means the network devices correct the corrupt data or ask for the data to be retransmitted. The cost of such checking and retransmission is network delay. <br>
<br>
Frame Relay performs error detection only, not error correction. It thereby leaves the task of error correction to the protocols used by intelligent devices at each end of the network. These intelligent devices will provide end-to-end data integrity.
Since Frame Relay relies on the device at the end to perform retransmission and error recovery, there is significantly less processing required for the network and less overall delay. <br>
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<h2><b style="mso-bidi-font-weight:normal"><font size="4">Frame Relay</font><o:p><font size="4">
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<p class="MsoNormal"> <o:p>
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<p class="MsoNormal">DLCI uses how many bits?<o:p>
</o:p>
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<p class="MsoNormal">10 bits<o:p>
</o:p>
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<p class="MsoNormal">What抯 that in decimal?<o:p>
</o:p>
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<p class="MsoNormal">1023<o:p>
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<p class="MsoNormal">Strata LMI, Max connections?<o:p>
</o:p>
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<p class="MsoNormal">992<o:p>
</o:p>
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<p class="MsoNormal">Annex D LMI, Max connections?<o:p>
</o:p>
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<p class="MsoNormal">976<o:p>
</o:p>
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<p class="MsoNormal">- Timers and Counters - <o:p>
</o:p>
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<p class="MsoNormal"> <o:p>
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<p class="MsoNormal">T391:<o:p>
</o:p>
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<p class="MsoNormal">The interval, in seconds, between LMI status
inquiries; usually 10<o:p>
</o:p>
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<p class="MsoNormal">N391: <o:p>
</o:p>
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<p class="MsoNormal">The frequency, in cycles, between full-status
inquiries; usually 6<o:p>
</o:p>
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<p class="MsoNormal">T392:<o:p>
</o:p>
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<p class="MsoNormal">The interval, in seconds, between EXPECTED inquiries;
usually 15, and always > T391<o:p>
</o:p>
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<p class="MsoNormal">N392:<o:p>
</o:p>
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<p class="MsoNormal">Number of timeouts, out of [N393] consecutive
expected inquiries which will cause a port alarm<o:p>
</o:p>
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<p class="MsoNormal">N393:<o:p>
</o:p>
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