cat6 shielded channel performance -...
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Cat6 Shielded Channel Performance
Sterling VadenSuperior Modular Products
Cat6 Shielded Description
• Four connector, 100 meter channel• Shielded Cat6 compliant connectors.• Cat6 rated SSTP horizontal cable
(individually shielded pairs)• SSTP patch cords
Cat6 SSTP cable
• Foil shield over each pair
• No overall braid • Similar in size to Cat6
UTP cable
Channel TopologyTest
InterfaceNear End
a b c d e TestInterfaceFar End
solid stranded stranded solidsolid
C2C1 C3 C4
Length a = 7 m Length c = 76 m Length e = 7 m
Length b = 5 m Length d = 5 m
Cable arrangement for testing
• Six cables bundled together using tape every meter
• 90 meters of cable • No separation
between bundles on floor
Cables on rack for test• Two racks like this were
used, one at the near end and one at the far end.
• Patch cords left looped• Pyramid adapters used
with Cat6 test fixtures.• All unused pairs
common mode terminated.
Testing
• All pair combinations were measured for NEXT, FEXT, Insertion Loss, and Return Loss, Including all ANEXT and AFEXT combinations.
• Frequency range from 1 to 500 MHz• Only a sample of data will be shown• Full data sets available for analysis on CD.
Network analyzer NEXT noise floor
R e s id ual N E X T
-1 2 0
-1 1 0
-1 0 0
-9 0
-8 0
-7 0
-6 0
0 1 0 0 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0
F , M H z
NE
XT,
dB
1 2 N E X T F w d1 3 N E X T F w d1 4 N E X T F w d2 3 N E X T F w d2 4 N E X T F w d3 4 N E X T F w d1 2 N E X T R e v1 3 N E X T R e v1 4 N E X T R e v2 3 N E X T R e v2 4 N E X T R e v3 4 N E X T R e v
Typical NEXT, IL, RL, ELFEXTReturn Loss
-70
-60
-50
-40
-30
-20
-10
00 100 200 300 400 500 600
S11 dBS22 dBS33 dBS44 dBS55 dBS66 dBS77 dBS88 dBRL CH
Insertion Loss
-60
-50
-40
-30
-20
-10
00 100 200 300 400 500 600
S15 dBS26 dBS37 dBS48 dBIL Cat6 CH
PS NEXT
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
00 100 200 300 400 500 600
Pr1 PSNEXTPr2 PSNEXTPr3 PSNEXTPr4 PSNEXTPS NEXT CH
PS ELFEXT
-80
-70
-60
-50
-40
-30
-20
-10
00 100 200 300 400 500 600
Pr1 PSELFEXTPr2 PSELFEXTPr3 PSELFEXTPr4 PSELFEXTPS ELFEXT CH
Power Sum ANEXTAlien Power Sum NEXT
-100
-90
-80
-70
-60
-50
-40
-30
-20
0 100 200 300 400 500 600
Frequency, MHz
Alie
n P
ower
Sum
NE
XT,
dB
SolarFlare Proposed
Alien FEXT (ELFEXT)Alie n F E X T
-1 4 0
-1 2 0
-1 0 0
-8 0
-6 0
-4 0
-2 0
00 1 0 0 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0
S 1 5 d BS 1 6 d BS 1 7 d BS 1 8 d BS 2 5 d BS 2 6 d BS 2 7 d BS 2 8 d BS 3 5 d BS 3 6 d BS 3 7 d BS 3 8 d BS 4 5 d BS 4 6 d BS 4 7 d BS 4 8 d B
Conclusions• The Cat6 shielded (SSTP) channel supports
20 Gbit (or better) Shannon capacity over 100 meter channel
• Alien NEXT and Alien FEXT (ELFEXT) are at or below measurable levels for much of the frequency range.
• Port-to-port isolation will be an important design parameter for 10G BASE-T transceivers