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In the diagram above, VDSL2-48C line cards in the MCC and MCE shelves lose a forward
facing SFP+ socket to the chassis’ backplane. This is not the case with the VDSL2-48
Overlay line card, since it requires no backplane communication to a second card in the E7-2
same chassis. Both the RT and CO nodes are fully and only equipped with E7-2 VDSL2-48C
line cards, while they could also use transport cards (for example 10GE-4) in the MCC to
aggregate multiple ERPS rings or take advantage of longer range XFP optics. Both nodes
support protected 10GE ERPS Transport and / or RSTP or Link Aggregation network
protocols from the MCC shelf. See "Turning Up a Modular Chassis system" in the
Calix E7
User Guide
for configuration guidelines and detailed instructions for configuring a modular
chassis system.