CANOGA PERKINS L357 Gigabit Ethernet Service Unit - Manual (Page 13)

EdgeAccess Universal Chassis System
L357 Gigabit Ethernet Service Unit 2-3
2.2 Install the Cables
The L357 uses both electrical and fiber optic cables. Electrical UTP cables connect to the User Port.
Fiber optic cables connect to the Extension port. Dirty optical connectors are a common source of
link loss or attenuation problems, especially for single mode fiber (SMF). Clean the connectors
before plugging in a cable and whenever there is a significant or unexplained light loss. To prevent
contamination, always install protective dust covers on unused fiber optic connectors.
Follow these steps to install the cables:
1. Wipe the ferrule and the end-face surface of the male fiber coupler with a lint-free isopropyl
alcohol pad from a fiber cleaning kit.
2. Use canned air to blow out any dust from the female fiber coupler.
Caution: To avoid damaging the fiber end-surface or connector, use extreme care when
installing or removing cables.
3. Plug in the optical cables:
• If you have a single fiber interface, plug the cable into a pair of L357s, one at 1310 nm
wavelength and the other at 1550 nm wavelength.
• If you have a duplex connector, use Tx to Rx, and Rx to Tx orientation.
Caution: To protect the Ethernet port from an intrabuilding lightning surge, use a properly
grounded shielded cable.
4. If you have copper to the User port, plug the UTP Ethernet cable with RJ-45 connector into the
User port on the front of the L357.
5. Label each cable and connector with a signal name and direction.
2.3 Measure Fiber Link Attenuation and Transmit Power
Canoga Perkins recommends that you determine and record link attenuation and transmission power
before starting normal link traffic. The attenuation factor and transmission power identify potential
problems with links near the lower limit of receiver limitations.
For details on link attenuation and transmission power, see Chapter 5.