3Com 3C780 User Guide - Page 60

FDDI Cabling Rules

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2-20 Installing the Hub FDDI Cabling Rules The type of cabling you use depends on the media modules that you ordered. When installing the hub and the modules, observe these FDDI cabling rules: Fiber-Optic Cable s All cabling media must conform to the American National Standard FDDI Physical Layer Medium Dependent (PMD) Standard, ISO 166-1990, American National Standards Institute. s The standard FDDI cabling type supported by the LinkBuilder FDDI Workgroup Hub is multimode 62.5/125 µm. s The maximum length of this cable from the hub to any potential end station is approximately 2 km (1.25 mi) per the ANSI X3T9.5 specification. Attenuation must not exceed 11 dBm on any link between nodes regardless of distance. NOTE: When you insert the fiber-optic cable's media interface connector (MIC) into a fiber module port, the MIC must click twice to ensure a complete connection. Shielded Twisted-Pair Cable s The standard STP cabling type supported by the LinkBuilder FDDI Workgroup Hub is category 1 STP cable with DB-9 connectors. No crossover wiring is required. s The maximum length of this cable from the hub to any potential end station is 100 m (328 ft) per the SDDI de facto STP standard. s The STP cable connectors must conform to IBM token ring standards or their equivalent. The specifications for this standard are contained in AMP document number 6609, revision 11/01/88. Contact AMP Inc., Harrisburg, PA 17105, for a copy of this document. s The pin assignments for the type DB-9 FDDI shielded twisted-pair interface connector are shown in Table 2-1.

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2-20
Installing the Hub
FDDI Cabling Rules
The type of cabling you use depends on the media modules that you ordered.
When installing the hub and the modules, observe these FDDI cabling rules:
Fiber-Optic Cable
■
All cabling media must conform to the American National Standard
FDDI
Physical Layer Medium Dependent (PMD) Standard
, ISO 166-1990,
American National Standards Institute.
■
The standard FDDI cabling type supported by the LinkBuilder FDDI
Workgroup Hub is multimode 62.5/125 μm.
■
The maximum length of this cable from the hub to any potential end station
is approximately 2 km (1.25 mi) per the ANSI X3T9.5 specification.
Attenuation must not exceed 11 dBm on any link between nodes regardless
of distance.
NOTE:
When you insert the fiber-optic cable’s media interface connector
(MIC) into a fiber module port, the MIC must click twice to ensure a complete
connection.
Shielded Twisted-Pair Cable
■
The standard STP cabling type supported by the LinkBuilder FDDI
Workgroup Hub is category 1 STP cable with DB-9 connectors.
No cross-
over wiring is required.
■
The maximum length of this cable from the hub to any potential end station
is 100 m (328 ft) per the SDDI de facto STP standard.
■
The STP cable connectors must conform to IBM token ring standards or
their equivalent.
The specifications for this standard are contained in AMP
document number 6609, revision 11/01/88.
Contact AMP Inc., Harrisburg,
PA
17105, for a copy of this document.
■
The pin assignments for the type DB-9 FDDI shielded twisted-pair
interface connector are shown in Table 2-1.