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BCCs (Block Check Character). After this (and the check on the receiving side) the receiver will send an provide connectionless service:· Only U-frames can be used UI for data test, configure, and tear down a link. Sometimes "terminals" (particularly for WANs) or "devices"
ACK.SYN (Synchronous Idle) ·Provides the hardware recognizable bit pattern rquired to establish transporto LLC· Used with Local Area Networks (LANs)· Defined in 3. A family of Network Control Protocols(NCPs) for · Channel called broadcast or multiple access
character synchronization at the receiving adapter. ENQ (Enquiry) ·Recognized as a request for a IEEE 802
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