Characterizing Split Characterizing Split- -Symmetric Responses Symmetric Responses

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13 Οκτ 2013 (πριν από 3 χρόνια και 9 μήνες)

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Characterizing Split
Characterizing Split
-
-
Symmetric Responses
Symmetric Responses
12-October-2005
John Ewen

JDSU
12-Oct-2005IEEE 802.3aq 10GBASE-LRM Task Force1
Characterizing Split
Characterizing Split
-
-
Symmetric Response
Symmetric Response

Define “Peak Ratio”
to characterize
split-symmetric response

Peak Ratio = A2 / A1

A1 = amplitude of largest peak

A2 = amplitude of 2nd
largest peak

Ignore other (smaller) peaks

If only one peak exists,
define peak ratio = 0
5
6
7
8
9
10
0
0.2
0.4
0.6
0.8
1
Time
(UI)
Pulse Response (arb.)
A1
A2
12-Oct-2005IEEE 802.3aq 10GBASE-LRM Task Force2
MC67 Simulation Results
MC67 Simulation Results
0
0.
2
0.4
0.6
0.8
1
0
0.2
0.4
0.6
0.8
1
Peak
Ra
tio
Cumulative Distribution
M
C
67, 1-
1-225-1 sim
pl
ex link config
urat
ion


Offse
t
Ce
n
ter
Jo
int
0.5
0.6
0.7
0.8
0.9
1
0.9
0.91
0.92
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1
Pe
ak Ratio
Cumulative Distribution
MC67, 1-1-225-
1 sim
ple
x link con
figuration


O
ffset
Ce
nte
r
Joint

All links included, i.e. 0 ≤
PIE-D ≤∞

Split pulses more common for center launch, but exist for all launches

Peak Ratio 99%-tile ~0.8 for joint launch

Current split-symmetric stressor has peak ratio = 0.95

Not too bad for 300m, but pessimistic for 220m
12-Oct-2005IEEE 802.3aq 10GBASE-LRM Task Force3
Split
Split
-
-
Symmetric vs. Launch vs. PIE
Symmetric vs. Launch vs. PIE
-
-
D
D
0.5
0.55
0.
6
0.
65
0.
7
0.
75
0.8
0.
85
0.9
0.95
1
0.95
0.
955
0.96
0.
965
0.97
0.
975
0.98
0.
985
0.99
0.
995
1
Pe
a
k Ratio
Cumulative Distribution
MC67, 1
-1-225-1 sim
plex
link
c
onfigurati
on, Offset Launch Only


All PIE-D
PIE-D ≤
4.2dB
0.5
0.55
0.
6
0.
65
0.
7
0.
75
0.8
0.
85
0.9
0.95
1
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
1
Pe
a
k Ratio
Cumulative Distribution
MC67,
1-1-
225-1 si
m
plex
lin
k
c
onfigurati
on, Center Launch Only


All PI
E-D
PI
E-
D
≤ 4.2dB
0.5
0.55
0.
6
0.
65
0.
7
0.
75
0.8
0.
85
0.9
0.95
1
0.95
0.
955
0.96
0.
965
0.97
0.
975
0.98
0.
985
0.99
0.
995
1
Pe
a
k Ratio
Cumulative Distribution
MC67, 1-1-225-1 s
imp
lex l
ink confi
guratio
n,
Joint
Launc
h


All PI
E-D
PI
E-
D
≤ 4.2dB

Compare “passing”
links (PIE-D ≤
4.2dB) against total population

Split symmetric occur but are rare for OSL,
more common for CL &
JL

Joint launch statistics

22% are CL

78% are OSL

Relative weighting similar for all links (PIE-D ≤∞
) or “passing”
links (PIE-D ≤
4.2dB)
12-Oct-2005IEEE 802.3aq 10GBASE-LRM Task Force4
Joint Launch & Split
Joint Launch & Split
-
-
Symmetric
Symmetric
0
0.1
0.2
0.3
0.
4
0.5
0.
6
0.7
0.8
0.9
1
0.9
0.
91
0.
92
0.
93
0.
94
0.
95
0.
96
0.
97
0.
98
0.
99
1
Pea
k Rati
o
Cumulative Distribution
MC67, 1-1-225-1 s
i
mplex
link
c
onf
iguration, Joint
Laun
ch,
PIE
-D ≤ ∞


OS
L only
CL onl
y
Both

Joint launch population

~5% of OSL cases are potential
split-symmetric

Possible options

With current stressor, support
comment #15

Increase OMA for split-
symmetric case

Retarget stressor peak ratio to
match 99 %-tile of joint launch
(1:0.8)

Leave OMA for split-symmetric
case unchanged?

Replace split-symmetric with
pure symmetric
0
0.1
0.2
0.3
0.
4
0.5
0.
6
0.7
0.8
0.9
1
0.
95
0.
95
5
0.
96
0.
96
5
0.
97
0.
97
5
0.
98
0.
98
5
0.
99
0.
99
5
1
Pea
k Rati
o
Cumulative Distribution
MC67,
1-1-225-1 simpl
ex
link configur
at
ion, Joi
nt
Launc
h, PIE-D ≤ 4.2dB


OS
L only
CL onl
y
Both
12-Oct-2005IEEE 802.3aq 10GBASE-LRM Task Force5
Candidate Stressors
Candidate Stressors

Stressors created using methodology described in ewen_1_0305.pdf

Constraints modified to target desired shape

Split-symmetric with peak ratio ~ 0.8

Pure symmetric
12-Oct-2005IEEE 802.3aq 10GBASE-LRM Task Force6