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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 | None |
 | Warning: For field-wiring connections, use copper conductors only. For other electrical safety information, see . |
 | Note: 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 Lugs
 | Caution: 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). |
