Information Technology Reference
In-Depth Information
FIGURE B.4
The connectors used with thinnet are called BNC connectors—BNC male cable connectors and
BNC-Ts.
nectors must be provided, since the cable must be extended all the way to the work-
station and then back to the wall to complete the network path. For grounding rea-
sons, isolated-bulkhead connectors should be used (see the following section on
grounding). If no workstation is present, a short length of coax, with connectors at
both ends, can be used to jumper the two bulkhead connectors and maintain the
network path. Sometimes, instead of placing an outlet at the wall, the two lengths
of coax cable are run unbroken through an opening in the wall, or simply dropped
down from the ceiling. In this case, the two cables are simply joined with a BNC-T,
whether or not a workstation is present.
An entire thinnet segment is limited to 185 m (607 ft), which is approximately
200 m, thus the “2” in 10Base2. This includes every leg as well as the small contri-
bution of the connectors and Ts. Although each consecutive length of cable to each
workstation is added to the total, thinnet still makes conservative use of cable.
Adjacent offices can be wired together with only a small run of cable. Workstations
in the same room can be served with very short runs of cable (0.45 m or about 1.5
ft minimum). Thinnet may have as many as 30 nodes on a segment. As with thick-
net, only two repeaters may be used between any two workstations in a network,
without using bridges or routers (four repeaters, if two of the segments are repeater-
to-repeater links). This means that no more than three 185-m workstation segments
can be linked with repeaters. Bridges and routers may be used to extend the network
beyond this limit or to off-premise locations via WAN.
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