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M40e Power System Description
The M40e Multiservice Edge Router uses either AC or DC power. There are two load-sharing, pass-through power supplies located at the bottom rear of the chassis, as shown in M40e Chassis Description. The power supplies connect to the midplane, which distributes power to router components according to their individual voltage requirements. When the power supplies are installed and operational, they automatically share the electrical load. If a power supply stops functioning for any reason, the remaining power supplies instantly begin providing all the power the router needs for normal functioning and can provide full power indefinitely.
 | Caution: Mixing AC and DC power supplies is not supported and prevents the router from booting. If two power supplies are installed, they must either both be AC or both DC. A circuit breaker box must be installed on a DC-powered router, whereas a circuit breaker is incorporated into each AC power supply. |
Power supplies are hot-removable and hot-insertable, as described in M40e Field-Replaceable Units (FRUs). To avoid electrical injury, carefully follow the instructions in Disconnecting AC Power from the M40e Router and Disconnecting DC Power from the M40e Router.
 | Note: After powering off a power supply, wait at least 60 seconds before turning it back on. After powering on a power supply, wait at least 60 seconds before turning it off. If the system is completely powered off when you power on the power supply, the Routing Engine boots as the power supply completes its startup sequence. If the Routing Engine finishes booting and you need to power off the system again, see Disconnecting AC Power from the M40e Router or Disconnecting DC Power from the M40e Router. After a power supply is powered on, it can take up to 60 seconds for status indicators—such as LEDs on the power supply, show chassis commands, and messages on the craft interface LCD—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds. |
Figure 1: M40e Router Power Supplies
AC Power Supply
An AC-powered router has two load-sharing, pass-through AC power supplies, located at the bottom rear of the chassis, as shown in M40e Chassis Description.
Each AC power supply has the components (see Figure 2):
- One LED—Indicates power supply status. It is green
and labeled OUTPUT OK. Table 1 describes the LED states.
In addition, power supply failure triggers the red alarm LED on the craft interface and the RED ALARM relay contact on the CIP. See M40e Craft Interface Alarm LEDs and Controls.
- Self-test button—Tests the power supply. Do not press this button; it is for use by qualified service personnel only.
- Internal fans—Cool the power supply.
Figure 2: M40e AC Power Supply
Table 1: States for M40e AC Power Supply LED
Label | Color | State | Description |
|---|---|---|---|
OUTPUT OK | Green | On steadily | Power supply is inserted and is functioning normally. |
Blinking slowly | Power supply is not plugged in, or power switch is in off position (when other AC power supply is functioning). | ||
Blinking rapidly | Power supply is starting up. |
Table 2 lists electrical specifications for the AC power supply.
Table 2: Electrical Specifications for AC Power Supply
Description | Specification |
|---|---|
Maximum power output | 2900 W; isolated 3100 W; isolated |
AC input voltage | Nominal: 200 VAC, 208 VAC, 220 VAC, 240 VAC Operating range: 180 to 264 VAC (2900 W) Operating range: 198 to 264 VAC (3100 W) |
AC input line frequency | 47 to 63 Hz |
AC input current rating | 15 A @ 200 V 13 A @ 240 V |
Output voltages | +48 V @ 7.3 A (cooling system), +8 V @ 6 A (bias), –50 V @ 50 A isolated |
| Note: An AC-powered router can use only 220 VAC power (nominal range 200–240 VAC), not 110 VAC power (nominal range 100–120 VAC). |
DC Power Supply
A DC-powered router has two load-sharing, pass-through DC power supplies, located at the bottom rear of the chassis, as shown in M40e Chassis Description.
Each DC power supply has the components (see Figure 3):
- LEDs—Indicate power supply status. There is a green
one labeled CB ON, a blue one labeled OUTPUT OK, and an yellow one labeled CB OFF. Table 3 describes the LED states.
In addition, power supply failure triggers the red alarm LED on the craft interface and the RED ALARM relay contact on the CIP. See M40e Craft Interface Alarm LEDs and Controls.
- Self-test button—Tests the power supply. Do not press this button; it is for use by qualified service personnel only.
Figure 3: M40e DC Power Supply
Table 3: States for M40e DC Power Supply LEDs
Label | Color | State | Description |
|---|---|---|---|
CB ON | Green | On steadily | Power supply is inserted correctly and is receiving power. Circuit breaker is on. |
OUTPUT OK | Blue | On steadily | Power supply is inserted and is functioning normally. |
Blinking | Power supply is not functioning, is starting up, or is not properly inserted, or airflow is not sufficient. | ||
CB OFF | Yellow | On steadily | Power supply is functioning, but the circuit breaker is off. |
Table 4 lists electrical specifications for the DC power supply.
Table 4: M40e Electrical Specifications for DC Power Supply
Description | Specification |
|---|---|
Maximum power output | 3150 W; nonisolated |
DC input voltage | Nominal: –48 VDC, –60 VDC Operating range: –40.5 to –72 VDC Note: If the input voltage from the DC power source drops below –40.5 VDC, the platform automatically shuts down. During automatic shutdown, the circuit remains active. When the input voltage returns to –42.75 VDC, the platform automatically starts up again and the system returns to normal operation within 30 minutes. No operator intervention is required. |
DC input current rating | 80 A @ –48 V |
Output voltages | +48 V @ 8.3 A (cooling system), +8.3 V @ 6 A (bias), –48 V to –60 V@ 75 A |
Circuit Breaker Box on a DC-Powered Router
On a DC-powered router, the circuit breaker box is located on the rear of the chassis, above the right power supply, as shown in M40e Chassis Description. (On an AC-powered router, the slot for the box is covered by a blank panel.)
The circuit breaker box houses two circuit breakers and sets of terminal studs, corresponding positionally to the two power supplies, as shown in Figure 4. For proper router operation and power load sharing, connect a different external DC power source to each set of terminal studs.
In addition, a grounding cable attaches to separate grounding points located above the circuit breaker box, as shown in M40e Chassis Description. For more information, see M40e Chassis Grounding Specifications.
Figure 4: M40e Circuit Breaker Box
Fuses
The router uses fuses from the Cooper Bussman brand GMT series for the FPCs, MCSs, PCGs, and SFMs. The fuses are located in a fuse box on the rear of the midplane. When the fuse for a component blows, the component stops functioning even though it is installed correctly and the power supplies are providing power to the router. For more information, see Using Blown Fuse Indicators to Troubleshoot the M40e Router. For fuse replacement instructions, see Replacing a Fuse on an M40e Router.
