Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


M120 AC Power, Connection, and Power Cord Specifications


In the AC power configuration, the router can have up to two load-sharing AC power supplies (see AC Power Supply), located at the rear of the chassis in slots PEM0 and PEM1 (left to right). Each AC power supply provides power to all components in the router. When two power supplies are present, they share power almost equally within a fully populated system. The AC power supplies are fully redundant. If one power supply fails or is removed, the remaining power supply instantly assumes the entire electrical load without interruption. One power supply provides the maximum configuration with full power.

Each AC power supply has two AC appliance inlets. Each requires a dedicated AC power feed. For 100-120 VAC, both inlets are used. For 200-240 VAC, only the top inlet is used. Most sites distribute power through a main conduit that leads to frame-mounted power distribution panels, one of which can be located at the top of the rack that houses the router. An AC power cord connects each power supply to the power distribution panel.

Detachable AC power cords, each 2.5 m (approximately 8 ft) long, are supplied with the router. The C19W (right angle) appliance coupler at the female end of the cord inserts into the appliance inlet coupler, type C13, as described by International Electrotechnical Commission (IEC) standard 60320. The plug at the male end of the power cord fits into the power source receptacle that is standard for your geographical location.


The AC power cord for the router is intended for use with the router only and not for any other use.


Translation from Japanese: The attached power cable is only for this product. Do not use the cable for another product.


In North America, AC power cords must not exceed 4.5 m (approximately 14.75 ft) in length, to comply with National Electrical Code (NEC) Sections 400-8 (NFPA 75, 5-2.2) and 210-52, and Canadian Electrical Code (CEC) Section 4-010(3). The cords supplied with the router are in compliance.

Table 1 provides specifications and Figure 1 depicts the plug on the AC power cord provided for each country or region.

Table 1: AC Power Cord Specifications


Model Number

Electrical Specification

Plug Type



240 VAC, 50 Hz AC




220 VAC, 50 Hz AC


Europe (except Denmark, Italy, Switzerland, and United Kingdom)


220 or 230 VAC, 50 Hz AC

CEE 7/7



230 VAC, 50 Hz AC

CEI 23-16/VII



125 VAC, 50 or 60 Hz AC

JIS 8303

Two required


220 VAC, 50 or 60 Hz AC


One required

North America


120 VAC, 60 Hz AC

NEMA 5-15P

Two required


250 VAC, 60 Hz AC


One required

United Kingdom


240 VAC, 50 Hz AC


Figure 1: M120 AC Plug Types
M120 AC Plug Types

If you plan to operate a maximally configured AC-powered router, we recommend that you provision at least 33 A @ 240 VAC (11 A per inlet) for the system, or at least 11 A  maximum @ 240 VAC for each power supply. Use a facility circuit breaker rated for 20 A, 125/250 VAC minimum for each AC power supply. Doing so enables you to operate the router in any configuration without upgrading the power infrastructure.

In North America and Japan, use both inlets for 125 VAC.


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