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Datasheet:  https://www.juniper.net/us/en/local/pdf/datasheets/1000414-en.pdf

HW:    https://www.juniper.net/documentation/en_US/release-independent/junos/topics/concept/ex4550-hardware-overview.html

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https://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/specifications/expansion-module-ex4550.html

EX4550-EM-8XSFP   8x 10G SFP+

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mixed VC/ Virtual Chassis:    EX4550 to EX4200 ( or EX4500 or EX4500 )

EX4550-VC-128G

which you can connect the EX4550 switch with EX4200, EX4500, or EX4550 switches to form a Virtual Chassis.

128-Gigabit Virtual Chassis module

https://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/specifications/virtual-chassis-module-ex4550.html

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