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M7i DC Power Cable and Cable Lug Specifications


DC Power Cables

To supply power to the router, connect power cables to a separate, dedicated DC power source for each power supply and attach the cables to the field-wiring terminals on each power supply. Most sites distribute DC power through a main conduit that leads to frame-mounted DC power distribution panels, one of which might be located at the top of the rack that houses the router. A pair of cables (one input and one return) connects the field-wiring terminals to the power distribution panel.

Table 1 summarizes the specifications for the DC power cables, which you must supply.

Table 1: DC Power Cable Specifications

Quantity and Specification

Maximum Equal Length

Two 14-AWG (2.08 mm2) single-strand-count wire cables for each power supply



For field-wiring connections, use copper conductors only.


Power cords and cables must not block access to router components or drape where people could trip on them.

Figure 1 shows how to attach the DC power cables. The power cables insert into the field-wiring terminals located on each power supply— the input terminal is labeled -48V and the return terminal is labeled RTN.

Figure 1: DC Power Cable Connections
DC Power Cable Connections

DC Power Lugs


Before router installation begins, a licensed electrician must attach a cable lug to the power cables that you supply. A cable with an incorrectly attached lug can damage the router (for example, by causing a short circuit).