Marek,
Here's my analysis of comment #424.
Comment #424 SC 141.7.12
Comment:
"When measuring jitter at TP1[i] and TP5[i]" do we give even recommendations for jitter at
TP1[i] and TP5[i] in this clause?
Suggested remedy:
Delete? Change to address the jitter measurements we do have (in SRS calibration)?
Bill's Analysis:
From D2.0:
141.3.2 PMD block diagram
The PMD sublayer is defined at the reference points shown in Figure 141–2 for PQ type PMDs.
For PQ type PMDs, test points TP1[i], TP2, TP3, and TP4[i] refer to the downstream channel, while test points TP5[i], TP6, TP7, and TP8[i] refer to the upstream channel. In the
downstream channel, TP2 and TP3 are compliance points, while in the
upstream channel TP6 and TP7 are compliance points.
TP1[i], TP4[i], TP5[i], and TP8[i] are reference points for use by implementers, defined on a per channel basis. The optical transmit signal is defined at the output end of a patch cord (TP2 for the downstream channel and TP6 for
the upstream channel), between 2 m and 5 m in length, of a fiber type consistent with the link type connected to the transmitter.
Unless specified otherwise, all transmitter measurements and tests defined in 141.7 are made at TP2 or TP6. The optical receive signal is defined at the output of the fiber optic cabling (TP3 for the downstream channel and
TP7 for the upstream channel) connected to the receiver. Unless specified otherwise, all receiver measurements and tests defined in 141.7 are made at TP3 or TP7.
Proposed Response:
Proposed Reject
Per 141.3.2, measurements made at TP1 and TP5 are test points used by implementers, and are not to be used as compliance test points for this standard. Thus, the guidance in 141.7.12 on use of high pass filters for TX jitter measurement at TP1 and TP5 are not compliance test points that require a jitter measurement verification. All transmitter measurements and tests defined in 141.7 are made at TP2 or TP6.
Regards,
Bill
-- Bill Powell Nokia Fixed Networks CTO Group 2301 Sugar Bush Rd. Raleigh, NC 27612 USA bill.powell@xxxxxxxxx (M) +1 919-614-3225
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