OLP-85/OLP-85P
67
R
EMOTE
R
EFERENCING
11 A
PPENDIX
- R
EFERENCING
M
ETHODS
11
A
PPENDIX
- R
EFERENCING
M
ETHODS
For a fiber loss measurement per length, connection, and splice,
the technician must indicate the fiber length, the number of
connections, and how many splices are present in the fiber
system under test.
There are four additional connections required to perform a test:
• A connection at the local device to the local reference jumper.
• A connection from the local reference jumper to the fiber
system under test.
• A connection from the fiber system under test to the remote
reference jumper.
• A connection from the remote reference jumper to the remote
device.
The reference method chosen (One, two or three jumper
reference) will determine how many of these connections are
included in the loss measurement and in the loss limit.
NOTE:
In the following procedures, test-reference jumper cables are
assumed to:
• be compliant to IEC 61280-4-1/4-2
• be high-quality and in good condition
• be equal in length and relatively short
• have no end-face damage or debris
Disconnecting the connection at the transmitter of the local or
remote OLP-85/OLP-85P after a reference is performed
invalidates the reference. Since the connection at the receiver is
not glass-to-glass, it can be removed without affecting the
reference. Any loss associated with the test-reference jumper
cables is automatically considered in the test results.
Remote Referencing
NOTE:
The figures below display referencing methods (loopback/
remote) for single-mode fibers. The contents described apply
equally to measurements under multi-mode fibers.
One jumper cable reference
This reference removes the losses at Connection 1 and
Connection 4 from the measurement.
