Information Technology Reference
In-Depth Information
26.14.23
State the main advantage of Manchester coding and show the line code for the bit
sequence
01111010101101010001011010
26.14.24
Explain the main functional differences between 100BASE-T, 100BASE-4T and
100VG-AnyLAN.
26.14.25
Prove that the maximum length of segment that can be used with 10 Mbps
Ethernet is 840 metres. Assume that the propagation speed is 1.5
10
8
m/s and the
length of the preamble is 56 bits. Note, a collision must be detected by the end of
the transmission of the preamble. Also, why might the maximum length of the
segment be less than this?
×
26.14.26
What problem might be encountered with fast Ethernet, with respect to the maxi-
mum segment length?
26.15 Ethernet crossover connections
The standard connections for 10BASE and 100BASE are
1 TD+
2 TD-
3 RD+
4 UNUSED
5 UNUSED
6 RD-
7 UNUSED
8 UNUSED
1 TD+
2 TD-
3 RD+
4 UNUSED
5 UNUSED
6 RD-
7 UNUSED
8 UNUSED
RJ-45
RJ-45
where RD is the receive signals (this is known as RECEIVE in 100BASE) and TD the
transmit signals (TRANSMIT). These cable connections are difficult to set-up and most con-
nections use a straight through connection (as given in Table 26.3). Ports which have the
cross-over connection internal in the port are marked with an “X”.
The standard connections for 100BASE-T4 is given next:
