Insertion Loss get grades of A, B, C, etc.
|Table 2 – Single Mode attenuation grades at 1310nm and 1550nm (dB)|
|Attenuation grade||Attenuation (≥ 97%)a||Mean||Notes|
|A||Reserved for future application|
|B||≤ 0.25||≤ 0.12|
|C||≤ 0.50||≤ 0.25|
|D||≤ 1.0||≤ 0.50|
The probability of a random mated connector set of meeting or exceeding the specific level of attenuation will be ≥ 97%. This performance is reached considering a statistical distribution of connector’s parameters (MFD, eccentricity and tilt angle) and using a nominal value for wavelength.
Return Loss get grades of 1, 2, 3, etc.
|Table 3 – Single Mode Return Loss grades at 1310nm and 1550nm (dB)|
|Return Loss grade||Return Loss (≥ 97%)a||Notes|
|1||≥ 60||≥ 55dB in unmated condition (APC only)|
Reference Grade Connectors
IEC 61755-2-4, 61755-2-5
|Table 1 – Single Mode attenuation grades at 1310nm|
|Reference grade a||Attenuation a dB||Contribution to measurement uncertainty b dB|
|R1||≤ 0.1||± 0.1|
|R2||≤ 0.2||± 0.2|
a Under the assumption of worst case alignment with identical connector plug. Expected attenuation measured when connecting two plugs of the same grade may be higher due to significant measurement uncertainty.
b As described in Clause 8.