throbber
Common mode Rejection Through
`Center Tap of Magnetics
`
`Roger Karam
`
`rkaram@cisco.com
`
`309-E
`1171_04F8_c1
`
`Cisco Systems
`
`1
`
`Juniper Ex 1039-p. 1
`Juniper v ChriMar
`IPR2016-01399
`
`

`

`Test Schematic
`
`309-E
`1171_04F8_c1
`
`Cisco Systems
`
`2
`
`Juniper Ex 1039-p. 2
`Juniper v ChriMar
`IPR2016-01399
`
`

`

`Differential Voltage at the Transmitter Due to Center
`Tap Noise Voltage
`
`309-E
`1171_04F8_c1
`
`Cisco Systems
`
`3
`
`Juniper Ex 1039-p. 3
`Juniper v ChriMar
`IPR2016-01399
`
`

`

`Signal on the Wire w/o Noise
`
`309-E
`1171_04F8_c1
`
`Cisco Systems
`
`4
`
`Juniper Ex 1039-p. 4
`Juniper v ChriMar
`IPR2016-01399
`
`

`

`Signal on the Wire With Noise
`
`309-E
`1171_04F8_c1
`
`Cisco Systems
`
`5
`
`Juniper Ex 1039-p. 5
`Juniper v ChriMar
`IPR2016-01399
`
`

`

`Signal into Phy RX w/o Noise
`
`309-E
`1171_04F8_c1
`
`Cisco Systems
`
`6
`
`Juniper Ex 1039-p. 6
`Juniper v ChriMar
`IPR2016-01399
`
`

`

`Signal into Phy RX with Noise
`
`309-E
`1171_04F8_c1
`
`Cisco Systems
`
`7
`
`Juniper Ex 1039-p. 7
`Juniper v ChriMar
`IPR2016-01399
`
`

`

`Signal on the Wire with Noise
`
`309-E
`1171_04F8_c1
`
`Cisco Systems
`
`8
`
`Juniper Ex 1039-p. 8
`Juniper v ChriMar
`IPR2016-01399
`
`

`

`Conclusion
`
`• AC Filter the DC Power Supply into the Center
`Tap, a clean DC power will insure that no
`common mode to differential conversion can
`affect the receiver.
`• Along with our past presentation of the ability
`of the magnetics to deliver up to 300ma without
`any effects on the MLT3 signal, this insures
`that a signal-pair powering solution has the
`potential of accommodating the 1000BT and
`the cables with only 2-operational pairs.
`
`309-E
`1171_04F8_c1
`
`Cisco Systems
`
`9
`
`Juniper Ex 1039-p. 9
`Juniper v ChriMar
`IPR2016-01399
`
`

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