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ATM Cabling E-3
ATM Cabling
When planning the installation, thoroughly inspect the present cabling to
determine if it meets the specifications in the cabling system or standards
used at the site.
In addition to adhering to the local standards, all cable must conform to
the American National Standard
ATM Physical Layer Medium Dependent
(PMD) standard, ISO.166-1990, American National Standards Institute,
which defines the Physical Medium Dependent (PMD) layer of the ATM
network. Currently, there are two approved PMD standards: Multi-mode
Fiber (MMF-PMD), which is defined in ANSI standard X.3-166-1992, and
Single Mode Fiber (SMF-PMD), which is defined in ANSI standard
x.3-184-198x.
3Com supports multi-mode fiber (MMF-PMD) 62.5/125 µm and Category
one (1) single mode fiber (short reach) (SMF-PMD). When deciding
whether to use multi-mode or single mode fiber, determine the maximum
interstation distance (the distance from the CoreBuilder 7000 to any
potential end station):
If the maximum interstation distance is less than or equal to 2
kilometers (1.25 miles), use multi-mode fiber (MMF-PMD).
If the maximum interstation distance is greater than 2 kilometers (1.25
miles) and less than or equal to 14.4 kilometers (8.6 miles), use single
mode fiber (short reach) (SMF-PMD).
Caring for Fiber Optic
Transceivers
Fiber optic transceivers are sensitive optical devices that need careful
handling. The following information offers suggestions about caring for
fiber optic cable.
Dirt on the Fiber Optic Lens
If dirt collects on the fiber optic lens, you may notice that the LED for an
ATM port either does not light or lights yellow. You may also notice
degraded performance of that port, as indicated by a decrease in the Link
Error Rate (LER) estimate for that port.
To prevent dust from collecting on the fiber optic lens, keep the dust
covers on the ports at all times when they are not in use. To clean a fiber
optic lens when it becomes dirty, see the section “Cleaning Dirty Fiber
Optic Cables”.