MX2008 DC Power System

Note:

The MX2008, MX2010, and MX2020 routers support the same power modules AC, DC, 240 V China, and universal PSMs and PDM.

In the DC power configuration, the router contains up to two DC PDMs located at the rear of the chassis in slots PDM0/Input0 and PDM1/Input1 (bottom to top). A minimum of one PDM is required per system (two PDMs per MX2008 chassis) for nonredundant power. The DC PDMs provides power interface to nine PSMs.

Four PDMs provide full redundancy.

Note:

Power backplane distributes regulated 52 VDC to all boards supplied by that system.

Each DC PDM has seven DC inputs (–48 VDC and return terminals for each input) (see Figure 1). Select 60 A or 80 A input feed capacity on the DC PDM by setting the switch to the rated amperage of DC power input feeds.

Note:

This switch applies to all inputs of this PDM. Selecting 60 A reduces the available power output capacity of the PSMs supplied by this PDM.

Note:

The type of feed that you use on the DC PDM (60 A or 80 A) depends on the distribution scheme and distribution equipment. With a 60-A feed, the maximum power supply output power is limited to 2100 W while the maximum power supply input power is limited to 2400 W. With an 80-A feed, the maximum power supply output is limited to 2500 W while maximum power supply input power is limited to 2800 W. The system power management software calculates the available and used power based on DIP switch positions in the PDM.

Note:

The MX2008, MX2010, and MX2020 routers support the same power modules AC, DC, 240 V China, and universal PSMs and PDMs.

In the DC power configuration, the router contains up to two DC power distribution modules (PDMs) located at the rear of the chassis in slots PDM0/Input0 and PDM1/Input1 (bottom to top). A minimum of one PDM is required per system (two PDMs per chassis) for nonredundant power. The DC PDM provides a power interface to nine power supply modules (PSMs).

Two PDMs provide full redundancy. In a redundant configuration, a total of fourteen 60-A or 80-A input feeds (7-feed DC PDMs), and a total of eighteen 60-A or 80-A input feeds (9-feed DC PDMs) are supported.

Note:

The power backplane for a subsystem distributes regulated 52 VDC to all boards supplied by that subsystem.

Each DC PDM has seven or nine DC inputs (–48 VDC and return terminals for each input). You can select 60-A or 80-A input feed capacity on the DC PDM by setting the DIP switch on the PDM to the rated amperage of the DC power input feeds.

Note:

The selected input capacity applies to all inputs of this PDM. Selecting 60 A reduces the available power output capacity of the PSMs supplied by this PDM.

Figure 3 shows the MX2008 DC PDM.

Note:

The type of feed that you use on the DC PDM (60-A or 80-A) depends on the distribution scheme and distribution equipment. With a 60-A feed, the maximum power supply output power is limited to 2100 W while the maximum power supply input power is limited to 2400 W. With an 80-A feed, the maximum power supply output is limited to 2500 W while the maximum power supply input power is limited to 2800 W. The system power management software calculates the available and used power based on DIP switch positions in the PDM.

In the DC power configuration, the router contains up to two DC power distribution modules (PDMs) located at the rear of the chassis in slots PDM0/Input0 and PDM1/Input1 (bottom to top). A minimum of one PDM is required per system (two PDMs per chassis) for nonredundant power. The DC PDM provides a power interface to nine power supply modules (PSMs).

Two PDMs provide full redundancy for the router. In a redundant configuration, a total of a total of eighteen (9-feed DC PDMs) are supported.

Note:

The power backplane for a subsystem distributes regulated 52 VDC to all boards supplied by that subsystem.

Each DC PDM (240 V China) has nine DC inputs, (see Figure 4).

Note:

The MX2008, MX2010, and MX2020 routers support the same power modules AC, DC, 240 V China, and universal PSMs and PDMs.

Each DC PDM faceplate contains one bicolor LED for each of the nine –48 V input power feeds, indicating the correct or incorrect polarity connection of each feed. See . Figure 5

Table 1: DC Power Distribution Module LEDs

Label	Color	State	Description
–48V=80A	Green	On	RTN and –48V input feeds are connected. PDM is functioning normally.
	–	Off	RTN input feed is not connected or present.
			–48V input feed is not connected or present.
			RTN and –48V input feeds are not connected.
	Red	On	RTN or –48V input feeds may be reversed, feed live.

Each DC PDM (240 V China) faceplate contains one LED for each of the nine input power feeds, indicating the correct or incorrect polarity connection of each feed. See Figure 6 and Table 2 DC PDM (240 V China) LEDs.

Table 2: DC Power Distribution Module (240 V China) LEDs

Color	State	Description
Green	On	Positive and negative input feeds are connected. PDM is functioning normally.
–	Off	Positive input feed is not connected or present.
		Negative input feed is not connected or present.

Note:

The MX2008, MX2010, and MX2020 routers support the same power modules AC, DC, 240 V China, and universal PSMs and PDMs.

The MX2008 supports a DC power system. The DC power system operates with feeds of 60 A or 80 A current limited. A total of nine feeds are required to fully power the MX2008. Another nine feeds are required to provide feed redundancy (a total of 18 60-A or 80-A feeds). In the DC power configuration, the router contains up to nine DC PSMs located at the rear of the chassis in slots PSM0 through PSM8, (left to right). The DC PSMs in slots PSM0 through PSM8 provide power to the all router components including MPCs in slot 0 through 9, RCBs in slot 0 and 1, SFBs in slot 0 through 7, and fan trays 0 and 1.

Note:

The MX2008 systems configured for DC input power must use only DC PDMs and DC PSMs. You cannot mix AC and DC PSMs or PDMs within a single system.

Up to nine PSMs may be connected in parallel to increase available system power across MPCs as needed and provide redundancy. Figure 7 shows the DC PSM.

The DC power system is feed redundant. Each DC PSM can be connected to two separate feeds from different sources that are used to provide feed redundancy. If two feeds are connected, PSM input power is drawn from the feed with the higher voltage present. There are two PDMs per power system capable of carrying nine feeds each. Connect feeds from one source to one PDM and feeds from the other source to the second PDM of the power system. The primary input of the PSM is a dual redundant feed, INP0 and INP1. Both feeds are active during operation, but both feeds might or might not be providing current. Move the input mode DIP switch to the on or off position to determine the power supply feeds (see Table 3 and Figure 8). In addition, a PSM failure triggers the alarm LED on the craft interface. Each PDM has an LED per feed indicating whether the feed is active or not, or whether the feed is connected properly, see MX2008 DC Power (-48 V) System Electrical Specifications.

Table 3: DIP Switch Positions on the DC (-48 V) PSM

Left Switch Position	Right Switch Position	Input Source
Off	Off	None
On	Off	Input 0 (INP0)
Off	On	Input 1 (INP1)
On	On	Both Input 0 and Input 1

The MX2008 supports a DC power system. The 240 V China DC power system operates with nine feeds. A total of nine feeds are required to fully power the MX2008. Another nine feeds are required to provide feed redundancy (a total of 18 feeds In the DC power configuration, the router contains up to nine DC PSMs located at the rear of the chassis in slots PSM0 through PSM8, (left to right). The DC PSMs in slots PSM0 through PSM8 provide power to the all router components including MPCs in slot 0 through 9, RCBs in slot 0 and 1, SFBs in slot 0 through 7, and fan trays 0 and 1.

Note:

The MX2008 systems configured for DC (240 V China) input power must use only DC (240 V China) PDMs and DC PSMs. AC and DC PSMs or PDMs must not be mixed within a single system.

Up to nine PSMs may be connected in parallel to increase available system power across MPCs as needed and provide redundancy. MX2008 DC Power Supply Module (-48 V) Description) shows the DC PSM.

The DC power system is feed redundant. Each DC PSM can be connected to two separate feeds from different sources that are used to provide feed redundancy. If two feeds are connected, PSM input power will be drawn from the feed with the higher voltage present. There are two PDMs per power subsystem capable of carrying nine feeds each. Connect feeds from one source to one PDM and feeds from the other source to the second PDM of the power subsystem. The primary input of the PSM is a dual redundant feed, INP0 and INP1. Both feeds are active during operation, but both feeds may or may not be providing current. Move the input mode DIP switch to the on or off position to determine the power supply feeds (see MX2008 DC Power Supply Module (-48 V) Description and MX2008 DC Power Supply Module (-48 V) Description). In addition, a PSM failure triggers the alarm LED on the craft interface. Each PDM has an LED per feed indicating whether the feed is active or not, or whether the feed is connected properly, see MX2008 Router DC (240 V China) System Electrical Specifications.

Table 4: DIP Switch Positions on the DC (240 V China) PSM

Left Switch Position	Right Switch Position	Input Source
Off	Off	None
On	Off	Input 0 (INP0)
Off	On	Input 1 (INP1)
On	On	Both Input 0 and Input 1

Each DC PSM (-48 V and 240 China) faceplate contains four LEDs. These LEDs are described in Table 5. Nine bicolor LEDs, labeled 0 through 8 for the nine PSMs, are located in the center of the craft interface.

The primary input of the PSM is a dual redundant feed, INP0 and INP1. Both feeds are active during operation, but both feeds might or might not be providing current. In addition, a PSM failure triggers the alarm LED on the craft interface.

Table 5: MX2008 DC Power Supply Module LEDs

Label	Color	State	Description
PWR OK	Green	On	PSM is functioning normally with no alarms.
	Yellow	On	PSM controller is off with both INP0 and INP1 voltage out of range.
	–	Off	PSM is not functioning normally or the PSM controller is off.
FAULT	Red	On	PSM is not functioning normally or the DC input voltage of one or more feeds is out of range.
	–	Off	PSM is functioning normally or both the DIP switches are set to off.
INP0	Green	On	DC input is within required voltage range and the DIP switch is set to on.
	Yellow	On	DC input is detected but voltage is out of range.
	–	Off	DC input to the PSM is not present.
INP1	Green	On	DC input is within required voltage range and the DIP switch is set to on.
	Yellow	On	DC input is detected but voltage is out of range.
	–	Off	DC input to the PSM is not present.

Note:

The MX2008, MX2010, and MX2020 routers support the same power modules AC, DC, 240 V China, and universal PSMs and PDMs.

Table 6 lists the FRU power requirements for SFBs, RCBs, MPCs, and MICs. In addition, Table 6 lists the MPC power requirements with MICs and optics at various operating temperatures.

Typical power represents power under certain temperatures and normal operating conditions.

For PDMs with 60 A feeds, we recommend that you select the 60 A  @ –48 VDC switch for each input.

For PDMs with 80 A feeds, we recommend that you select the 80 A @ –48 VDC switch for each input.

Note:

The 240 V China DC PDMs do not have a switch selection.

If you do not plan to provision as recommended above, you can use the information in Table 6 to calculate the power consumption for your hardware configuration.

Note:

Unlike all the other MPCs, MPC6E, MPC8E, and MPC9E does not require an adapter card (ADC) to house the MPC in the MX2008 router.

Table 6: FRU DC Power Requirements

Component	Model Number	Maximum Power Requirement
Switch Fabric Boards (SFBs)
MX2008 SFB2	MX2008-SFB2	100 W (Typical) 110 W at 55° C 100 W at 40° C 95 W at 25° C
Fan Trays
Fan Trays	MX2000-FANTRAY-S	1500 W (Typical) 1700 W at 55° C 1500 W at 40° C 350 W at 25° C
Adapter Cards
ADC	MX2000-LC-ADAPTER	150 W
Routing Control Board (RCB)
RCB	REMX2008-X8-64G	100 W (Typical) 120 W at 55° C 100 W at 40° C 95 W at 25° C
MPCs
16x10GE MPC (seeMPC-3D-16XGE-SFPP)	MPC-3D-16XGE-SFPP	440 W at 55° C ambient
MPC1 (see MPC1)	MX-MPC1-3D MX-MPC1E-3D	165 W With MICs and optics: 239 W at 55° C 227 W at 40° C 219 W at 25° C
MPC1 Q (see MPC1 Q)	MX-MPC1-3D-Q MX-MPC1E-3D-Q	175 W With MICs and optics: 249 W at 55° C 237 W at 40° C 228 W at 25° C
MPC2 (see MPC2)	MX-MPC2-3D MX-MPC2E-3D	274 W With MICs and optics: 348 W at 55° C 329 W at 40° C 315 W at 25° C
MPC2 Q (see MPC2 Q) MPC2 EQ (see MPC2 EQ)	MX-MPC2-3D-Q MX-MPC2-3D-EQ MX-MPC2E-3D-Q MX-MPC2E-3D-EQ	294 W With MICs and optics: 368 W at 55° C 347 W at 40° C 333 W at 25° C
MCP2E P (see MPC2E P)	MX-MPC2E-3D-P	294 W With MICs and optics: 368 W at 55° C 347 W at 40° C 333 W at 25° C
MPC3E (see MPC3E)	MX-MPC3E-3D	440 W With MICs and optics: 520 W at 55° C, two 40 W MICs 420 W at 40° C, two CFP MICs with LR4 optics 408 W at 25° C, two CFP MICs with LR4 optics
32x10GE MPC4E (see 32x10GE MPC4E)	MX-MPC4E-3D-32XGE-SFPP	610 W With MICs and optics: 610 W at 55° C, two 40 W MICs 560 W at 40° C, two CFP MICs with LR4 optics 550 W at 25° C, two CFP MICs with LR4 optics
2x100GE + 8x10GE MPC4E (see 2x100GE + 8x10GE MPC4E)	MX-MPC4E-2CGE-8XGE	610 W With MICs and optics: 610 W at 55° C, two 40 W MICs 550 W at 40° C, two CFP MICs with LR4 optics 530 W at 25° C, two CFP MICs with LR4 optics
6x40GE + 24x10GE MPC5E 6x40GE + 24x10GE MPC5EQ	MPC5E-40G10G MPC5EQ-40G10G	With optics: 607 W at 55° C 541 W at 40° C 511 W at 25° C
2x100GE + 4x10GE MPC5E 2x100GE + 4x10GE MPC5EQ	MPC5E-100G10G MPC5EQ-100G10G	With optics: 607 W at 55° C 541 W at 40° C 511 W at 25° C
MPC6E	MX2K-MPC6E	1088 W with MICs and optics
MPC7E-MRATE	MPC7E-MRATE	400 W (Typical) 545 W at 55° C 465 W at 40° C 440 W at 25° C
MPC8E (without MICs)	MX2K-MPC8E	688 W (Typical) 805 W at 55° C 720 W at 40° C 690 W at 25° C
MPC9E (without MICs)	MX2K-MPC9E	838 W (Typical) 1018 W at 55° C 870 W at 40° C 840 W at 25° C
MICs
ATM MIC with SFP	MIC-3D-8OC3-2OC12-ATM	35 W
Gigabit Ethernet MIC with SFP	MIC-3D-20-GE-SFP	37 W
10-Gigabit Ethernet MIC with XFP	2-Port: MIC-3D-2XGE-XFP 4-Port: MIC-3D-4XGE-XFP	2-Port: 29 W 4-Port: 37 W
10-Gigabit Ethernet MIC with SFP+	MIC6-10G	74 W With optics: 53 W at 55° C, 40° C and 25° C with 10G BASE-SR and 10G BASE-LR optics 66 W at 55° C, 40° C and 25° C with 10G BASE-ER optics 74 W at 55° C, 40° C and 25° C with 10G BASE-ZR optics
10-Gigabit Ethernet DWDM OTN MIC	MIC6-10G-OTN	84 W With optics: 63 W at 55° C with 10G BASE-LR OTN optics 63 W at 40° C with 10G BASE-LR OTN optics 63 W at 25° C with 10G BASE-LR OTN optics
40-Gigabit Ethernet MIC with QSFPP	MIC3-3D-2X40GE-QSFPP	18 W
100-Gigabit Ethernet MIC with CFP	MIC3-3D-1X100GE-CFP	40 W
100-Gigabit Ethernet MIC with CXP	MIC3-3D-1X100GE-CXP	20 W
100-Gigabit Ethernet MIC with CFP2	MIC6-100G-CFP2	104 W With optics: 94 W at 55° C with 100G BASE-LR4 OTN optics 86 W at 40° C with 100G BASE-LR4 OTN optics 74 W at 25° C with 100G BASE-LR4 OTN optics
100-Gigabit Ethernet MIC with CXP	MIC6-100G-CXP	57 W 49 W at 55° C with CXP SR10 optics 49 W at 40° C with CXP SR10 optics 49 W at 25° C with CXP SR10 optics
100-Gigabit DWDM OTN MIC with CFP2	MIC3-100G-DWDM	With optics: 91 W at 55° C 83 W at 25° C
SONET/SDH OC3/STM1 Multi-Rate MIC	4-Port: MIC-3D-4OC3OC12-1OC48 8-Port: MIC-3D-8OC3OC12-4OC48	4-Port: 24 W at 55° C 22.75 W at 40° C 21.5 W at 25° C 8-Port: 29 W at 55° C 27.75 W at 40° C 26.5 W at 25° C
OC192/STM64 MIC with XFP	MIC-3D-1OC192-XFP	41 W at 55° C 38.5 W at 40° C 36 W at 25° C
Channelized SONET/SDH OC3/STM1 Multi-Rate MIC	4-Port: MIC-3D-4CHOC3-2CHOC12 8-Port: MIC-3D-8CHOC3-4CHOC12	4-Port: 41 W at 55° C 40 W at 40° C 39 W at 25° C 8-Port: 52 W at 55° C 50.5 W at 40° C 49 W at 25° C
Channelized OC48/STM16 MIC with SFP	MIC-3D-1CHOC48	56.5 W at 55° C 54.5 W at 40° C 53 W at 25° C
Tri-Rate MIC	MIC-3D-40GE-TX	41 W
MIC MRATE	MIC-MRATE	When installed into MPC8E: 1.250 A @ 48 V (60 W) When installed into MPC9E: 1.771 A @ 48 V (85 W)
DS3/E3 MIC	MIC-3D-8DS3-E3 MIC-3D-8CHDS3-E3-B	36 W at 55° C 35 W at 40° C 34 W at 25° C
Channelized OC3/STM1 (Multi-Rate) Circuit Emulation MIC with SFP	MIC-3D-4COC3-1COC12-CE	33.96 W

Most sites distribute DC power through a main conduit that leads to frame-mounting DC power distribution panels, one of which might be located at a location near the rack that houses the router. A pair of cables (one input and one return) connects each set of PDM input terminal studs to the power distribution panel.

The PSMs can be connected to two separate feeds from different sources that are used for feed redundancy. There are two PDMs located in slots PDM0/Input0 and PDM1/Input1 that are capable of carrying seven to nine feeds each. Each feed is connected from one source to one PDM and feeds from the other source to the second PDM of the DC power system. This configuration balances power draw for the system by using the commonly deployed A/B feed redundancy.

Each system provides N+1 PSM redundancy along with N+N feed redundancy. If both DC feeds are available, operating power draws from the feed with higher voltage. These feeds are set by the input mode DIP switch located on the DC PSM (see MX2008 DC Power Supply Module (-48 V) Description). Each set of power cables powers a single DC PSM and is capable of delivering 2500 W of power if 80-A feeds are connected. If feeds that connect to one PDM fail in a redundant configuration, the other feed starts to provide full power.

Figure 11 shows a typical DC source cabling arrangement.

All DC PSMs in a subsystem share the load. If one PSM fails in a redundant configuration, the remaining PSMs provide power to FRUs. Up to nine PSMs might be required to supply power to a fully configured router. A portion of power from each zone is reserved to power critical FRUs. These FRUs allow the system to operate even if power to a complete zone fails.

CAUTION:

You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (-) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each PDM.

Warning:

For field-wiring connections, use copper conductors only.

CAUTION:

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

Most sites distribute DC power through a main conduit that leads to frame-mounting DC power distribution panels, one of which might be located at a location near the rack that houses the router. A pair of cables (one input and one return) connects each set of PDM input terminal studs to the power distribution panel.

The PSMs can be connected to two separate feeds from different sources that are used for feed redundancy. There are two PDMs located in slots PDM0/Input0 and PDM1/Input1 that are capable of carrying seven to nine feeds each. Each feed is connected from one source to one PDM and feeds from the other source to the second PDM of the DC power system. This configuration balances power draw for the system by using the commonly deployed A/B feed redundancy.

Each system provides N+1 PSM redundancy along with N+N feed redundancy. If both DC feeds are available, operating power draws from the feed with higher voltage. These feeds are set by the input mode DIP switch located on the DC PSM (see MX2000 DC Power Supply Module (240 V China) Description). Each set of power cables powers a single DC PSM and is capable of delivering 2500 W of power if 20 A 240 V source is connected. If feeds that connect to one PDM fail in a redundant configuration, the other feed starts to provide full power.

Figure 12 shows a typical DC source cabling arrangement.

All DC PSMs in a subsystem share the load. If one PSM fails in a redundant configuration, the remaining PSMs provide power to FRUs. Up to nine PSMs might be required to supply power to a fully configured router. A portion of power from each zone is reserved to power critical FRUs. These FRUs allow the system to operate even if power to a complete zone fails.

CAUTION:

You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (-) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each PDM.

CAUTION:

The two input sources must have similar grounding type because the PSM can see 480 V if one source has positive ground (-240 V), and the other source has negative ground (+240 V). This might damage the PSM.

Warning:

For field-wiring connections, use copper conductors only.

CAUTION:

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

Note:

The MX2008, MX2010, and MX2020 routers support the same power modules AC, DC, 240 V China, and universal PSMs and PDMs.

Table 7 lists the DC power system electrical specifications.

Table 7: DC (-48 V) PSM Electrical Specifications per Input Configurations

Item	Specification
Maximum input current rating input voltage @ –40 VDC to –72 VDC	60 A (for 2100 W output) 73 A (for 2500 W output)
Maximum output power	2100 W @ 60 A 2500 W @ 73 A
Redundancy	N+1 PSM N+N feed redundancy
DC input voltage	–40 VDC to –72 VDC
DC nominal input current @ 48 VDC IN	49 A (for 2100 W output) 59 A (for 2500 W output)
Maximum DC output @ 52 VDC (upper and lower cage)	2500 W
DC standby output @ 5 VDC	30 W
Efficiency Note: This value is within load range 17–67% and nominal input voltage at 48 VDC.	91%

Table 9 lists the DC power system electrical specifications.

Table 9: DC PSM (240 V China) Electrical Specifications Per Input Configurations

Item	Specification
Maximum input current rating input voltage @ 190 - 290 VDC	16 A (for 2500 W output)
Maximum output power	2500 W @ 190 V/16 A
Redundancy	N+1 PSM N+N feed redundancy
DC input voltage	190 VDC to 290 VDC
DC nominal input current @ 240 VDC IN	14 A (for 2500 W output)
Maximum DC output @ 52 VDC (upper and lower cage)	2500 W
DC standby output @ 5 VDC	30 W
Efficiency Note: This value is within load range 17-67% and nominal input voltage at 240 VDC.	91%

Note:

The MX2008, MX2010, and MX2020 routers support the same power modules AC, DC, 240 V China, and universal PSMs and PDMs.

To operate a maximally or minimally configured DC-powered router, you must use a dedicated circuit breaker for each input DC feed. The circuit breaker must have the following specifications:

• Breaker Type: Hydraulic Magnetic

• Voltage Rating: Up to 125VDC

• Current Rating: 80A DC

• Delay Feature: DC Short Delay

• Interrupting Rating : 5000A

• Number of Poles: Single

For PDMs, if you plan to operate a maximally configured DC-powered router, we recommend that you provision at least 20 A  @ 240 VDC (nominal) for each DC input to the system. Use a customer site 2 pole circuit breaker rated according to respective National Electrical Code and customer site internal standards to maintain proper level of protection for the current specified above.

If you plan to operate a DC-powered router at less than the maximum configuration, we recommend that you provision a 2 pole circuit breaker according to respective National Electrical Code and customer site internal standards to maintain proper level of protection for the current specified above or each DC power supply rated for at least 125% of the continuous current that the system draws at 240 VDC.

Note:

The MX2008, MX2010, and MX2020 routers support the same power modules AC, DC, 240 V China, and universal PSMs and PDMs.

The cable lugs attach to the terminal studs of each PDM (see Figure 13).

Note:

The MX2008 supports 4-AWG DC power cable lugs for 80-A input and 60-A input.

CAUTION:

Before you install the router, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the router.

CAUTION:

The router is installed in restricted access location. It has a separate protective earthing terminal (Metric [–M6] and English [–¼-20] screw ground lugs) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earth terminal must be permanently connected to earth.

Table 11 summarizes the specifications for the DC power cables, which you must supply.

Table 11: DC Power Cable Specifications

Cable Type	Quantity and Specification
Power	Eighteen pairs of 4-AWG (21.2 mm2), used with 60-A or 80-A PDM. Minimum 75°C wire, or as required by the local code. You can select 60-A or 80-A input feed capacity on the DC PDM by setting the DIP switch on the PDM to the rated amperage of the DC power input feeds.

CAUTION:

You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each PDM.