CommScope ION-U L 7/8/85/17/19, Руководство пользователя

Страница: 35 / 53

3 Commissioning
MF0147A0A Page 35
3.3. Optical-Fiber-Cable Connection - Rules
Main optical system parameters:
Fiber:

Single mode fiber, type is 9.5/125 µm

Fiber-cable connectors LC/APC
ION-U system:

The pigtails for the connection between Master Unit and Remote Unit must
have a sufficient length. Protection for the optical fibers must be provided
where the fibers feed into the units.

The system attenuation of the optical fibers, including the connectors, must
not exceed 5 dB.
System attenuation and attenuation of optical components must be determined. This
can be achieved by measuring attenuation and reflection with an appropriate
measuring instrument. For pigtails, a total value of < 0.4 dB (measured to a reference
plug) can be assumed due to the dead zone of the reflectometer. These
measurements must be made with a sufficient length of optical fiber, at the input and
output of the device which has to be measured.
Fiber-System Installation:
Fiber-cable connectors have to be of the same type (LC/APC) as the connectors
used for the unit. The fiber-optic cables are connected to the optical transceiver.
Angled connectors are not compatible with straight optical connectors;
non-compatibility of connectors will result in permanent damage to
both connectors.
Before connecting the fiber cables, follow the procedure below to ensure optimized
performance. It is important for these procedures to be carried out with care:

Remove fiber-optic protective caps just before making the fiber connections.
Do not leave any LC/APC connectors open as they may attract dirt. Unused
optical connectors must always be covered by their caps.

Do not bend the fiber-optic cable in a tight radius (< 5 cm) as this may cause
damage to the cable and interrupt transmission.

Using high-grade alcohol and lint -free cotton cleaning swabs, clean the end of
the fiber-optic cable that will be inserted in the optical connectors on the donor
interface box. Use a fiber end-face inspection tool to scan both, the class fiber
and its surrounding area.

Check for dirt on the cladding, chips/pits, dirt on the ferrule, and scratches.