Cabletron Systems MT8-MIM Especificaciones descargar pdf (Pagina 107)

IEEE 802.5 Shielded Twisted Pair 10-3

Token Ring Network Requirements

Link Length

The operation of the Token Ring network places limitations on the amount of time

a signal may travel through the Token Ring. This limitation, in conjunction with

the amounts of loss that signals are susceptible to over different types of cabling,

results in speciﬁed maximum link lengths for all cabling in any Token Ring

network. The maximum link lengths given below assume that the cabling being

used to make the link is all of a homogenous type (all Type 1, all Type 6, etc.) and

that all cabling meets the other speciﬁed limits for Token Ring cabling.

The link length maximums are dependent upon the operating speed of the Token

Ring network and the circuitry type being used. Active circuitry connections

(those that provide regeneration and reclocking of the Token Ring signal at each

port) can support longer links than passive Token Ring networks.

STP Type 1,2

An active Token Ring network operating at 4 Mbps may incorporate Type 1 or

Type 2 STP links with lengths not exceeding 300 m (984 ft). If the Token Ring

network operates at 16 Mbps, this length is reduced to 150 m (492 ft).

If the Token Ring network does not incorporate active technology, the maximum

link length for a 4 Mbps Type 1 or 2 STP connection is 200 m (656 ft). When the

network speed is 16 Mbps, the maximum length is reduced to 100 m (328 ft).

STP Type 6

No matter what circuitry or speed is used in a Token Ring network, the length of

any Type 6 cable in that network may not exceed 30 m (98 ft). Type 6 cabling that

exceeds this 30 m length limit may not function properly in a Token Ring

network.

STP Type 9

An active Token Ring network operating at 4 Mbps may incorporate Type 9 STP

links with lengths not exceeding 200 m (656 ft). If the Token Ring network

operates at 16 Mbps, this length is reduced to 100 m (328 ft).

If the Token Ring network does not incorporate active technology, the maximum

link length for a 4 Mbps Type 9 STP connection is 133 m (436 ft). When the

network speed is 16 Mbps, the maximum length is reduced to 66 m (216 ft).

NOTE

STP cables of Type 6 should only be used as jumper or patch

cables.

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Cabletron Systems MT8-MIM Especificaciones Pagina 107