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Path Overhead
It is part of SPE and contain followings information: Performance monitor of synchronous transport , signal , path , track ,parity ,checks, and path status.
Figure Path Overhead
a.Path trace byte : The JI bytes in consecutive frames form a 64 kbps channel used for tracking the path . the JI byte send a continuous 64 bits string to verify the connection. The choice of the string is left to the application programs.
b.Path parity byte : Byte B3 is for bit interleaved parity like byte B1 and B2. But calculated for the path header.
c.Path signal label byte > Byte C2 is the path identification byte. It is used to identify different protocols used at higher levels .
d.Path status byte > Byte G1 is sent by the receiver to communicate its status to the sender.
e.Path user channel byte : The byte 2 bytes in consecutive frames like the F1 bytes form a 64 kbps channel is reserved for user needs,, but at the path level.
f.Virtual tributary indicate byte H4 is the multi frame indicator. It indicates payloads that cannot fit in single frame. Virtual tributaries are discussed in the next section.
show cdp is the command to verify if CDP is enabled.
1. Consider these two potential additions to the MIPS instruction set and explain how they would restrict pipelining. a) cp d1(r1), d2(r2) copy contents of word at address
Two hosts are connected by a path made of four links as shown in the figure below. The links are of data rate R = 2 Mbps each. Host A has a file of size F = 1,000,000 bytes to tran
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The program must be well documented which includes meaningful variable and subroutine names ("self documenting code") along with comments in the code. The following block of code w
To accept its goals, ATM uses fixed, small sized packets known cells. Every cell has 53 octets. VPI/VCI fields shows the cells destination. PRIO say if cell can be discarded CRC
Next hop to receiver does not relay on source of packet. This phenomenon is known 'Source Independence'. It has various benefits. It gives efficient and fast routing. Packet switch
Time out The protocols name Go Back N is derived from the sender behaviour in the presence of lost or overly delayed packets. A timer will again be used to recover
Virtual channel is normally a link from one source to one destination, although multicast connections are also allowed. The other name for virtual channel is virtual circuit.
Address Resolution Protocol resolves the MAC address if the IP address is known. It is a layer 3 protocol.
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