Cabletron Systems STHI User Manual
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.
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.
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.
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.
specifications.
Maximum Number of Stations on a Ring
1
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,
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,
) and
).
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.
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.