A repeater is a gizmo that gives your network signals a boost so that the signals can travel farther. It's kind of like a Gatorade station in a marathon. As the signals travel past the repeater, they pick up a cup of Gatorade, take a sip, splash the rest of it on their heads, toss the cup, and hop in a cab when they're sure that no one is looking.
You need a repeater when the total length of a single span of network cable is larger than the maximum allowed for your cable type:. For coaxial cable, the preceding cable lengths apply to cable segments - not individual lengths of cable. Wireless repeaters are capable enough to enhance the coverage of wireless signals. When a repeater is placed in a remote location, where the network signals can travel, but become weak.
The connectivity in such cases is increased due to the use of wireless repeaters. This is due to the fact that covers the gapes in communication and provide flawless roaming.
In a LAN when each individual unit is provided an access to communicate directly with the central device or hub, it is termed as star topology.
Topology can be defined as the physical set up to establish a network connection point. This central device is also called a multiport repeater. The purpose of this repeater is to allow the signal to travel over longer distances. Multiple ports Ethernet repeaters are used to overcome the deficiency of star topology cabling. This leads to the limit on the maximum number of in-series cable segments that are allowed by the rule when repeaters are used to build a larger LAN.
This takes a a longer time when the clock has a different frequency of phase to the previously received frame, which will always be the case when the frame is sent from a different source.
This means it takes a time for the receiver clock in a reepater to lock on to the timing of completely synchonise with of a received frame's preamble. This means the initial part of the preamble is never really reeeived by a repeater. If this shortened preamble were to be sent it may be insufficient to allow a NIC to acquire a lock before the start of the frame.
This is not allowed to happen because if a shortened preamble were to be sent it may be insufficient to allow a NIC to acquire a lock before the start of the frame. The repeater must therefore reconstruct the full preamble before the frame is sent out of the repeater.
An important job of a repeater is therefore to reconstruct the full preamble as a frame is sent out of the repeater. In reconstructing the preamble, a repeater will necessarily delay the signal. Note that since the repeater is responsible for changing the bit timing,it can not guarantee that the Inter-Frame Gap IFG generated by the sender is preserved in all cases.
However, connection between two segments can be extended over a long distance by using fiber modems. The main disadvantage associated with repeaters is their transparent nature because the signal received at one segment is truly transmitted to the other segment. Repeater does not understand the language of frame and therefore, cannot distinguish between noise and signal.
When a collision occurs on one segment, the same along with noise produced by collision is reproduced on the other segment by repeater. Repeaters can be classified into two categories. These are local and remote repeaters. Local repeaters are used to connect LAN segments separated by a very small distance.
Remote repeaters are used to connect LAN segments that are far from each other. A transmission line known as a link segment is provided between two remote repeaters. No nodes can be connected to this line.
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Classification of Repeaters. About Dinesh Thakur.
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