Cabletron Systems STH-24 User's Guide download pdf (Page 19)

Page 2-1

CHAPTER 2

Requirements & Speciﬁcations

This chapter describes network guidelines, power requirements, and

operating specifications for the STHI. Before performing the installation,

read this chapter and confirm that the network meets the requirements

and conditions specified herein. Failure to follow these guidelines may

result in poor network performance.

Refer to Appendix A,

TPIM Specifications

, for TPIM specifications.

Refer to Appendix B,

Media Specifications

, for cable specifications.

2.1 General Networking Considerations

Take care in planning and preparing the cabling and connections for the

network. The susceptibility of the LAN’s cables to crosstalk and noise

determines the network’s error rate, and thus, the efficiency of data

propagation on the network. The quality of the connections, the length of

cables and other conditions of the installation are critical factors in

determining the quality of the network.

All devices connected to the STHI must meet IEEE 802.5 Token Ring

specifications.

Maximum Number of Stations on a Ring

The maximum stack composed of four 24-port STH hubs and one 24-port

STHI offers a total of 120 TCU ports, but the number of ports available on

the LAN may be increased by the use of passive Multi-Station Access

Units (see to Section 1.2.6,

Support for Passive MAU Workgroups) and

TPIM Ring In / Ring Out connections to other devices (see Section 1.2.3,

RI & RO Ports).

While there is no recommended limit to the number of TCU ports to be

made available in a stack, the recommended maximum number of stations

to be inserted simultaneously into a single ring is 255 when using STP lobe

cabling and 150 when using UTP cabling anywhere on the ring. If the ring

has been extended through RI/RO connections, consider the number of

ports on ring extensions as well as those in the stack itself.

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Cabletron Systems STH-24 User's Guide Page 19