Cabletron Systems MCC-16, Руководство пользователя, Страница: 76 / 90

CABLING
B-2
B.2 LOBE CABLING
Lobe cabling provides for the connection between end station and lobe,
or Trunk Coupling Unit (TCU) ports. A station can transmit data to and
receive data from other stations on the ring via the lobe cable attachment
to the concentrator.
B.2.1 Lobe Port
A lobe port accepts phantom current or a fiber key to allow the insertion
of a station on the ring via the lobe segment attached to the concentrator.
B.2.2 Station Port
A station port transmits phantom current or a fiber key to enter the ring.
B.3 REQUIREMENTS AND RECOMMENDATIONS
To achieve optimal performance from your installation, observe the
following recommendations:
• Maintain a punch-down block/patch panel limit of two between lobe
ports and wall outlets.
• Use properly grounded metal troughs, ducts, etc. for carrying Token
Ring cabling.
•
Avoid routing Token Ring cabling near twisted pair cables that exit a
building or are susceptible to lightning strikes and power surges.
•
Do not use UTP cabling with high voltage (greater that 5 volts) signals
with sharp rise or fall times. The noise coupling from such signals
could directly cause errors on the Token Ring network.
•
Ensure that the network meets the performance requirements listed in
Table B-1 .
•
Do not exceed the recommended cable lengths listed in Table 2-2 .