- The most obvious way
to connect
multiple networks:
- Connect the networks directly (e.g. with extension wires)
Example:
- Why this will
not work:
- Signal strength
attentuates (weakens)
over a
long distance
Result:
- Many bit errors due to noise
- Signal strength
attentuates (weakens)
over a
long distance
- Amplifier:
- Amplifier (booster) = a circuit that can boost the signal strength
- Attempt #2:
- Problems with this
technique:
- The resulting network
has a
very large
end-to-end propagation
delay:
Result:
- Large delays will
reduces the
effectiveness of
carrier sensing
- Remember Aloha ?
- The nodes in
the Aloha network
were too far apart
for carrier sensing to be
useful
See: click here
- The nodes in
the Aloha network
were too far apart
for carrier sensing to be
useful
- Large delays will
reduces the
effectiveness of
carrier sensing
- There are many nodes
in the network:
Result:
- Increased number of
transmissions
- This will increase the
number of collisions
- Back off will more frequent and will take longer to resolve
- Increased number of
transmissions
- The resulting network
has a
very large
end-to-end propagation
delay: