37
FIBRE OPTIC CABLING
Fig. 1 Typical MTP Cassette & Trunk Configuration
total of ten optical connectors and five sections of cable so
it’s imperative to minimise losses at each connection point.
This will ensure that your network will function as planned.
While this style has more connection points, it does provide
the best combination in terms of the highest density,
modularity, flexibility, versatility and significantly reduced
installation times.
The maximum loss expectation for a standard grade LC
connector which is often the cassette’s front interface is
0.50dB, but typical around -0.30dB. For an MPO connector,
the losses are higher at a maximum of -0.75dB.
Whereas a high grade, low loss system will produce a LC
connector at -0.20dB, with a typical around -0.10dB and an
MPO/MPO connector at a maximum of -0.35dB.
Now compare these channel loss numbers to those
allowed in Fig. 2 and it becomes immediately apparent that
there is very likely to be an issue at 10GBase, let alone SR4
and SR10.
High Grade MPO/MTP® Elite/LC Channel Loss
OM3 LC
Interface
-0.20dB à Cassette à MPO
Interface
-0.35dB à 100m
OM3 cable
(-0.30dB) à Cassette à MPO
Interface
-0.35dB à LC Interface
-0.20dB =
-1.40dB
OM4 LC
Interface
-0.20dB à Cassette à MPO
Interface
-0.35dB à 150m
OM4 cable
(-0.45dB à Cassette à MPO
Interface
-0.35dB à LC Interface
-0.20dB =
-1.55dB
Standard Grade MPO/LC Channel Loss
OM3 LC
Interface
-0.5dB à Cassette à MPO
Interface
-0.75dB à 100m
OM3 cable
(-0.30dB) à Cassette à MPO
Interface
-0.75dB à LC Interface
-0.50dB =
-2.80dB
OM4 LC
Interface
-0.5dB à Cassette à MPO
Interface
-0.75dB à 150m
OM4 cable
(-0.45dB) à Cassette à MPO
Interface
-0.75dB à LC Interface
-0.50dB =
-2.95dB
Challenging the Edge:
The “Data Centre in a Box” concept enables
equipment to be deployed in non-traditional
Data Centre environments.
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