digico D5 Live Schnellstart-Handbuch - Seite 12

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Setup & Installation Manual

Care of the optical cable system.....................................................................

Whilst the system is very robust, like all connector systems it should be treated with care, the show de-

pends on it!

The Stratos HMA connector is a precision machined device containing 2 lenses and an 1/2 turn bayonet

style screw locking device. Because it is an in/out connection, a plug will fit into a socket in 1 direction

only.

All connectors have captive dust covers. These MUST be fitted to the exposed connector any time the

connector is not in use. This is to prevent dust landing on the lenses and to give mechanical protection to

these expensive devices.

The cable is 2 separate "light pipes" in 1 very strong lightweight outer jacket. The armour just inside the

surface of the jacket itself is nearly impossible to cut by hand with any sort of blade or pull apart except

with the aid of machines. However the glass strands inside can be broken by hard hits or tight bending (like

any type of glass!).

Typical optical cable breaks do not have the cable broken right through and it may look OK externally.

Typical causes of optical cable breakage are being run over by a wheel in a rail (such a sliding doors used

in loading bays) or by trapping in heavy tight fitting door, such as used in recording studios. Very tight

bends caused by pulling a cable very tight with a knot tied in it can also cause the light pipe to break.

It should be noted that the optical cable is not repairable on site. It is best considered that it is not repair-

able at all, and treated with due care. In general it is not considered economic to repair broken optical

cables.

Repair and making of these cables is a highly skilled job requiring specialised tools and materials. Because

the lenses are bonded with an optical glue, the internal parts of connectors cannot be re-used. It is not

possible to "splice" broken cable sections without using a connector to terminate the broken ends of the

glass strands. The usual fix for a break near a cable end is to shorten the cable past the break and fit a

new plug. A break in the middle leads to 2 cables half the length with 2 new plugs or just scrapping the

cable.

Checking the Optical cables................................................................................

Note that the data transmission system uses IR laser light sources and is scattered light system. This

means the data signal cannot be seen, unlike Toslink cables used for CD players for example. This means

looking at cable connected to a live source will not show if the signal is getting through. As with all laser

sources users should not look directly into the end of cable with the other end end connected

To test the integrity of a Stratos HMA cable, use a regular light source (torch/flashlight or table light) at one

end and see if the light emerges from both lenses at the other end. Because the cables uses lenses, this

will normally appear as the light is quite distant down a tunnel. Which in a way it is!

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