DC Power Supply

S12700 and S12700E Series Agile Switches Hardware Installation and Component Replacement

This document describes hardware installation procedures of the S12700 series switches, troubleshooting methods for common hardware faults, and switch maintenance instructions.

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Power Supply Configuration Without Power Distribution Boxes
Power Supply Configuration with Power Distribution Boxes

Power Supply Configuration Without Power Distribution Boxes

Table 5-3 and Table 5-4 list the power modules applicable to the S12700 and S12700E series switches and configurations of the power modules.

Table 5-3 Configurations of the power modules applicable to the S12700 series switches

Device Model	Maximum Power Consumption of Chassis	Power Module	Power Module Configuration
S12704	2550 W	2200 W DC power module	1+0, 1+1, 2+0, 2+1 (recommended), 2+2, 3+0, 3+1, 4+0
S12708	5234 W	2200 W DC power module	1+0, 1+1, 2+0, 2+1, 2+2, 3+0, 3+1 (recommended), 3+3, 4+0, 4+1
S12710	4644 W	2200 W DC power module	1+0, 1+1, 2+0, 2+1 (recommended), 2+2
S12712	6790 W	2200 W DC power module	1+0, 1+1, 2+0, 2+1, 2+2, 3+0, 3+1, 3+3, 4+0, 4+1 (recommended)

Table 5-4 Configurations of the power modules applicable to the S12700E series switches

Device Model	Maximum Power Consumption of Chassis	Power Module	Power Module Configuration
S12700E-4	3344 W	2200 W DC power module	1+0, 1+1, 2+0, 2+1 (recommended), 2+2, 3+0, 3+1, 4+0
S12700E-8	6950 W	2200 W DC power module	1+0, 1+1, 2+0, 2+1, 2+2, 3+0, 3+1 (recommended), 3+3, 4+0, 4+1, 5+0, 5+1, 6+0
S12700E-12	8981 W	2200 W DC power module	1+0, 1+1, 2+0, 2+1, 2+2, 3+0, 3+1, 3+3, 4+0, 4+1 (recommended) 5+0, 5+1, 6+0

The following figures show the full configurations of power modules in a switch.

As shown in Figure 5-5:
- Two system power modules of the S12700/S12700E work in 1+1 redundancy mode.
Figure 5-5 1+1 redundancy of power modules
Figure 5-6 shows the 2+2 redundancy of power modules.
- Two system power modules of the S12700/S12700E work in 2+2 redundancy mode.
Figure 5-6 2+2 redundancy of power modules
Figure 5-7 shows the 3+3 redundancy of power modules.
Figure 5-7 3+3 redundancy of power modules

Table 5-5 Requirements for DC power distribution

Power Module	Technical Specifications	Power Cable Cross-Sectional Area	Maximum Power Supply Distance	Number of Inputs	Circuit Breaker Rated Current	Output Terminal Type on Power Distribution Device
2200 W DC power module (OT terminals)	Rated input voltage: -48 V DC/-60 V DC Input voltage range: -40 V DC to -72 V DC Maximum input current: 60 A Maximum output current: 42 A	10 mm²	14 m	Equal to the number of power modules	≥ 60 A	OT terminals or cord end terminals. To use other types of terminals, purchase the terminals and prepare cables onsite.
		16 mm²	23 m
		25 mm²	36 m
2200 W DC power module (quick-connect terminals)	Rated input voltage: -48 V DC/-60 V DC Input voltage range: -40 V DC to -72 V DC Maximum input current: 60 A Maximum output current: 42 A	10 mm² Delivered with power modules, with a fixed length of 3 m	3 m	Equal to the number of power modules	≥ 60 A	DC quick-connect terminals.

Each DC power module must be connected to an independent circuit breaker.
The current rating of the circuit breaker cannot be smaller than the maximum current allowed by the power cable.

Select appropriate power cables according to the power supply distances. If the required power supply distance exceeds the maximum power supply distance, use power distribution boxes. The power supply distance is the cable length between the power distribution frame and power modules.
When using the N+N redundancy mode, equally divide the power modules into two groups and connect the two groups of power modules to two independent power supply systems. This configuration provides redundancy of power supply systems to enhance system reliability.
The current rating of the upper-level circuit breaker cannot be smaller than the maximum current allowed by the power cable.

Power Supply Configuration with Power Distribution Boxes

Table 5-6 and Table 5-7 list the power modules applicable to the S12700 and S12700E series switches and configurations of the power modules.

Table 5-6 Configurations of the power modules applicable to the S12700 series switches

Device Model	Maximum Power Consumption of Chassis	Power Distribution Box	Power Module	Power Module Configuration
S12704	2550 W	2200 W DC power distribution box	2200 W DC power module	1+0, 1+1, 2+0, 2+1 (recommended), 2+2, 3+0, 3+1, 4+0
S12708	5234 W	2200 W DC power distribution box	2200 W DC power module	1+0, 1+1, 2+0, 2+1, 2+2, 3+0, 3+1 (recommended), 3+3, 4+0, 4+1
S12710	4644 W	2200 W DC power distribution box	2200 W DC power module	1+0, 1+1, 2+0, 2+1 (recommended), 2+2
S12712	6790 W	2200 W DC power distribution box	2200 W DC power module	1+0, 1+1, 2+0, 2+1, 2+2, 3+0, 3+1, 3+3, 4+0, 4+1 (recommended)

Table 5-7 Configurations of the power modules applicable to the S12700E series switches

Device Model	Maximum Power Consumption of Chassis	Power Distribution Box	Power Module	Power Module Configuration
S12700E-4	3344 W	2200 W DC power distribution box	2200 W DC power module	1+0, 1+1, 2+0, 2+1 (recommended), 2+2, 3+0, 3+1, 4+0
S12700E-8	6950 W	2200 W DC power distribution box	2200 W DC power module	1+0, 1+1, 2+0, 2+1, 2+2, 3+0, 3+1 (recommended), 3+3, 4+0, 4+1, 5+0, 5+1, 6+0
S12700E-12	8981 W	2200 W DC power distribution box	2200 W DC power module	1+0, 1+1, 2+0, 2+1, 2+2, 3+0, 3+1, 3+3, 4+0, 4+1 (recommended), 5+0, 5+1, 6+0

The following figures show the full configurations of power modules in a switch.

If more than one power module is installed in a switch, you can connect the power modules to the same power source or different power sources. It is recommended that you connect the power modules to different power sources to improve power reliability.

As shown in Figure 5-8:
- When a 2200 W DC power distribution box is used, two system power modules of the S12700/S12700E work in 1+1 redundancy mode.
Figure 5-8 2200 W DC power distribution box and 1+1 redundancy of DC power modules (different power sources)
As shown in Figure 5-9:
- When a 2200 W DC power distribution box is used, two system power modules of the S12700/S12700E work in 1+1 redundancy mode. If the equipment room does not have many power sources but has 126 A circuit breakers, the two power modules can be connected to the same power source. The power input line can be split into two in the power distribution box using a short-circuiting bar.
- To use a single power input for the two power modules, ensure that the rated current of the circuit breaker connected to the power modules is larger than 126 A and the circuit breaker must be connected to a 35 mm² power cable.
- Redundant input and output terminals on the power distribution box can be left for future use.
Figure 5-9 2200 W DC power distribution box and 1+1 redundancy of DC power modules (same power source)
As shown in Figure 5-10:
- When a 2200 W DC power distribution box is used, four system power modules of the S12700/S12700E work in 2+2 redundancy mode.
Figure 5-10 2200 W DC power distribution box and 2+2 redundancy of DC power modules (different power sources)
As shown in Figure 5-11:
- When a 2200 W DC power distribution box is used, four system power modules of the S12700/S12700E work in 2+2 redundancy mode. If the equipment room does not have many power sources but has 126 A circuit breakers, the power modules can be connected to the same power source. The power input line can be split into two in the power distribution box using a short-circuiting bar.
- To use a single power input for the two power modules, ensure that the rated current of the circuit breaker connected to the power modules is larger than 126 A and the circuit breaker must be connected to a 35 mm² power cable.
- Redundant input and output terminals on the power distribution box can be left for future use.
Figure 5-11 2200 W DC power distribution box and 2+2 redundancy of DC power modules (same power source)
Figure 5-12 shows the power distribution system with a 2200 W DC power distribution box and 3+3 redundancy of DC power modules.
Figure 5-12 2200 W DC power distribution boxes and 3+3 redundancy of DC power modules

Generally, the internal power cables between power distribution boxes and cabinets are installed beforehand. Use the power cables delivered with DC power modules of the switch as the internal power cables. The external power cables between power distribution boxes and power distribution frames need to be installed onsite. Table 5-8 describes requirements for external power cables.

Table 5-8 Requirements for external power cables

Power Module	Technical Specifications	Power Cable Cross-Sectional Area	Maximum Power Supply Distance (Circuit Breaker Rated Current)	Number of Inputs	Output Terminal Type on Power Distribution Device
2200 W DC power module	Rated input voltage: -48 V DC/-60 V DC Input voltage range: -40 V DC to -72 V DC Maximum input current: 60 A Maximum output current: 42 A	16 mm²	18 m (≥ 63 A)	Equal to the number of power modules	OT terminals or cord end terminals. To use other types of terminals, purchase the terminals and prepare cables onsite.
		25 mm²	29 m (≥ 63 A)
		35 mm²	41 m (≥ 63 A) 20 m (≥ 126 A)

Each DC power module must be connected to an independent circuit breaker.
The current rating of the circuit breaker cannot be smaller than the maximum current allowed by the power cable.

When using the N+N redundancy mode, equally divide the power modules into two groups and connect the two groups of power modules to two independent power supply systems. This configuration provides redundancy of power supply systems to enhance system reliability.

Use of a 2200 W DC Power Distribution Box

Figure 5-13 shows how a 2200 W DC power distribution box is connected to power modules in an S12708 chassis when the power modules work in 1+1 redundancy and require inputs from different power sources.

Figure 5-13 Use of a 2200 W DC power distribution box for 1+1 redundancy of power modules in an S12708 chassis

Power Supply Configuration Without Power Distribution Boxes
Power Supply Configuration with Power Distribution Boxes

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Updated: 2023-10-23

Document ID: EDOC1000069460

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This document describes hardware installation procedures of the S12700 series switches, troubleshooting methods for common hardware faults, and switch maintenance instructions.

Power Supply Configuration Without Power Distribution Boxes

Power Supply Configuration with Power Distribution Boxes

Use of a 2200 W DC Power Distribution Box

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