Abstract
A high-density Ethernet access device is housed in a 19-inch rack-mountable chassis occupying a single rack unit. In place of discrete RJ45 connectors, the faceplate of the device is populated with Mini-SAS High Density (Mini-SAS HD) connectors, each compliant with SAS 3.0 and the SFF-8644 mechanical specification and presenting a 100 Ohm characteristic impedance that matches twisted-pair Ethernet. A breakout cable has a Mini-SAS HD plug connector at a first end that mates with a faceplate receptacle and three RJ45 connectors at a second end. Within each connector, the pins are allocated among the differential pairs and ground returns of multiple Ethernet ports, with a ground return provided for each differential pair, and a shielded cable isolates the ports from one another to mitigate crosstalk. The arrangement consolidates multiple Ethernet ports onto each faceplate connector, allowing the device to present 144 Ethernet ports within the single-rack-unit footprint, as compared to a maximum of approximately 48 ports achievable with discrete RJ45 connectors, while also accommodating management and auxiliary interfaces such as a passive optical network (PON) interface, a universal serial bus (USB) port, and a console port.
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Recommended Citation
Anonymous, "High density Ethernet ports in a Switch / ONU", Technical Disclosure Commons, ()
https://www.tdcommons.org/dpubs_series/10486