2
O
VERVIEW
OF
THE
FDDIL
INK
M
ODULE
This chapter describes the features, specifications, and typical use of the FDDILink
module for the NETBuilder II bridge/router.
Module Features
Table 2-1 summarizes the features of the FDDILink module.
Table 2-1
FDDILink Module Features
Feature
Summary
Hot-swap capability
Allows you to install, or remove and reinstall, the module without
turning of the NETBuilder II bridge/router.
Compatibility
Multimode
Single-mode
Connects to any FDDILink network through SC connectors. Transceiver
accepts 100
µ
m 62.5 center core, multimode fiber with 62.5
µ
m core
and 125
µ
m cladding.
Connects to any FDDILink network through SC connectors. Transceiver
accepts 100
µ
m 8.7 center core, single-mode fiber with 8.7
µ
m core
and 125
µ
m cladding.
Connections
Single- or dual-attached capabilities.
Keying
Supports and accepts A, B, or S type ports for network connection.
Cable support
Multimode
Single-mode
Accepts multimode duplex fiber of 62.5/125
µ
m. An 11-db optical
budget size allows cables up to 2 km long.
Accepts single-mode duplex fiber of 8.7/125
µ
m. An 11-db optical
budget size allows cables up to 15km long.
Flexible topology
Topology and capacity can be configured by setting conditions on the
network external to the NETBuilder II base system. The capacity and
topology of the FDDILink network is not fixed. Capacity is determined
by a combination of cable lengths and connector capabilities.
Accessible informa-
tion on the EEPROM
Provides FDDILink module product information that can be accessed via
the monitor utility or user interface.
Interface speed
25 MHz.
Controller speed
12.5 MHz.
Clocks
25 MHz symbol clock rate.
12.5 MHz byte clock rate.
Laser safety
Single- and mixed-mode FDDILink modules are certified Class 1 laser
safe.
