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Dear
Colleagues,
it is not possible
for me to join the next telco, but I would like to post my suggestions about the
launch conditions for the standard proposal which are already included in the current
spec proposal for the TP2 test:
1. The launch condition should be specified using the EFD (encircled flux distribution) because this is a accurate definition contrary to the descriptions by offset launch or with the CPR value. 2. The goal should be to define one measurement which can be applied for 62µm and 50µm fibers. 3. The solution for that is to take for small radii the definiton of the launch for the 850nm high speed transmission: P(EFD)<=30% for r<=4,5µm. This avoids to have to large power in the center area. For the large radii we should take the value which is scaled from 50µm to 62µm radius: P(EFD)>= 86% for r>24µm. 4. This definition should include the launch with the offset patchcord. Joerg
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