Document Title:
MTP
®
Loopback Casing Installation
Document Number: AEN-1430, Rev. 1.0
3 of 17 THE USE OF SAFETY GLASSES FOR EYE PROTECTION IS RECOMMENDED
1.4
Tools and Materials
Safety Glasses
Permanent Marker
Metric Ruler
Fiber Optic Side Cutters
Masking Tape
Loctite
®
4861
™
, 403
™
, 4860
™
, or 411
™
Prism
®
Instant Adhesive
WARNING:
Refer to the manufacturer’s Safety Data Sheet (SDS) for
proper handling and potential hazards
2.0
Polarity and Loopback
There are several ways that fibers can be mapped to the optical physical layer interface of
a transceiver. When installing a link between two transceivers, the ultimate goal is to
provide an optical path for a transmitter on one end of a channel to the corresponding
receiver on the other end of the channel. When a loopback is in place, an optical path is
formed between a transmitter and receiver in the same transceiver.
Important:
In order to assemble a loopback device correctly, it is important to know
the polarity of the transceiver that the loopback device will be used for.
Refer to the transceiver manufacturer’s specifications to determine
polarity.
Note:
In this document, it is assumed that the polarity of the transceiver is compatible
with the guidelines in ANSI/TIA-568.3.
Loopback testing is primarily only performed to verify continuity in the fiber optic
infrastructure or troubleshoot transceiver hardware.
Note:
A loopback device is not meant to be used to measure channel losses between
transceivers or link losses in the fiber optic infrastructure – use an Optical Loss
Test Set and applicable industry standards for this purpose.