S6720S-26Q-EI-24S-DC

Version Mapping

Table 1 lists the mapping between the S6720S-26Q-EI-24S-DC chassis and software versions.

**Table 1** Version mapping
Series	Model	Software Version
S6720S-EI	S6720S-26Q-EI-24S-DC	V200R009C00 and later versions

Appearance and Structure

Figure 1 S6720S-26Q-EI-24S-DC appearance

1	Power module slot 1 NOTE: Applicable power modules: 170 W AC power module 170 W DC power module	2	Power module slot 2 NOTE: Applicable power modules: 170 W AC power module 170 W DC power module
3	One console port	4	One ETH management port
5	One USB port	6	Two 40GE QSFP+ ports Applicable modules and cables: QSFP+ optical module 1 m, 3 m, and 5 m QSFP+ to QSFP+ high-speed copper cables 1 m, 3 m, and 5 m QSFP+ to 4SFP+ high-speed copper cables 10 m QSFP+ to QSFP+ AOC cable 10 m QSFP+ to 4SFP+ AOC cable NOTE: A 40GE QSFP+ optical port can be split into four 10GE ports.
7	Twenty-four 10GE SFP+ ports Applicable modules and cables: GE optical module GE-CWDM optical module GE-DWDM optical module GE copper module (100M/1000M auto-sensing supported) 10GE SFP+ optical module (OSXD22N00 and SFP-10G-ZR not supported) 1 m, 3 m, 5 m, and 10 m SFP+ high-speed copper cables 3 m and 10 m SFP+ AOC cables 0.5 m and 1.5 m SFP+ dedicated stack copper cables (the last 16 ports are supported, used for zero-configuration stacking, supported in V200R011C10 and later versions)	8	Ground screw NOTE: It is used with a ground cable. The switch has two ground screws, any of which can be used to install a ground cable.
9	Monitoring port NOTE: This port is reserved and cannot be used currently.	-	-

Port Description

10GE SFP+ port

A 10GE SFP+ Ethernet optical port supports auto-sensing to 1000 Mbit/s. It sends and receives service data at 1000 Mbit/s or 10 Gbit/s. Table 2 describes the attributes of a 10GE SFP+ Ethernet optical port.

**Table 2** Attributes of a 10GE SFP+ port
Attribute	Description
Connector type	LC/PC
Optical port attributes	Depend on the optical module used
Standards compliance	IEEE802.3ae
Working mode	GE/10GE auto-sensing

40GE QSFP+ port

A 40GE QSFP+ optical port sends and receives service traffic at 40 Gbit/s and can be split into four 10GE ports. After a split, the 40GE QSFP+ optical port needs to be connected to a remote device using a 1-to-4 QSFP+ fiber (with matching optical modules), a 1-to-4 QSFP+ AOC cable, or a 1-to-4 QSFP+ copper cable. Table 3 describes the attributes of a 40GE QSFP+ optical port.

**Table 3** Attributes of a 40GE QSFP+ optical port
Attribute	Description
Connector type	MPO/LC
Optical port attributes	Depend on the optical module used
Standards compliance	IEEE802.3ba

Console port

The console port is connected to a console for on-site configuration. The port must use a console cable. The console port is used when a switch is powered on for the first time. For details about the attributes of a console port, see Table 4.

**Table 4** Attributes of a console port
Attribute	Description
Connector type	RJ45
Standards compliance	RS-232
Working mode	Duplex Universal Asynchronous Receiver/Transmitter (UART)
Baud rate	9600 bit/s, 19200 bit/s, 38400 bit/s, 57600 bit/s, or 115200 bit/s Default value: 9600 bit/s

ETH management port

You can connect a switch to a configuration terminal or network management workstation through the ETH management port to configure the switch locally or remotely. The port must use an Ethernet cable. You can choose to download the software package through the ETH management port in the BootLoad menu. File transfer through the ETH management port is faster than transfer through the console port. Table 5 describes the attributes of an ETH management port.

**Table 5** Attributes of an ETH management port
Attribute	Description
Connector type	RJ45
Standards compliance	IEEE802.3
Working mode	10/100 Mbit/s auto-sensing
Maximum transmission distance	100 m

In V200R012C00 and later versions, you can log in to the switch that contains the ETH management port for the first time through the ETH port. For details, see "First Login to a Switch" in the Configuration Guide - Basic Configuration. If you have logged in to the device for the first time by pressing and holding the MODE button for 6 seconds or longer and saved the configuration, the default configuration on the ETH port will be cleared. In this case, you cannot log in to the switch for the first time through the ETH port. You are advised to log in to the switch for the first time through the ETH port.

USB port

The USB port can have a USB flash drive connected to upgrade the switch, or transfer configuration files or other files. The USB port can only connect to a USB flash drive that complies with USB 2.0.

USB flash drives from different vendors differ in model compatibility and drivers. If a USB flash drive cannot be used, try to replace it with another one from a mainstream vendor. Switches support a maximum of 128 GB USB flash drives.

Indicator Description

The S6720S-26Q-EI-24S-DC has the same types of indicators as the S6720S-26Q-EI-24S-AC. For details, see Indicator Description.

Power Supply Configuration

The S6720S-26Q-EI-24S-DC can be configured with a single power module or double power modules for 1+1 power redundancy. AC and DC power modules can be used together in the same switch.

Figure 2 shows the power supply connections of dual DC power modules. After DC power is transmitted to the PWR module, the PWR module provides 12 V output voltage, and the motherboard provides power for the entire device.

Figure 2 Power supply connections of dual DC power modules

NEG: negative wire

RTN: positive wire

GND: 12 V reference ground

Figure 3 shows the power supply connections of dual AC power modules. After AC power is transmitted to the PWR module, the PWR module provides 12 V output voltage, and the motherboard provides power for the entire device.

Figure 3 Power supply connections of dual AC power modules

L: Live wire

N: Neutral wire

PGND: Protection ground wire

GND: 12 V reference ground

Heat Dissipation

The S6720S-26Q-EI-24S-DC has three built-in fans for forced air cooling. Air flows in from the left side and front panel, and exhausts from the right side.

Technical Specifications

Table 6 lists technical specifications of the S6720S-26Q-EI-24S-DC.

**Table 6** Technical specifications
Item	Description
Memory (RAM)	2 GB
Flash	512 MB in total. To view the available flash memory size, run the display version command.
Mean time between failures (MTBF)	69.53 years
Mean time to repair (MTTR)	2
Availability	> 0.99999
Service port surge protection	NA
Power supply surge protection	Using AC power modules: ±6 kV in differential mode, ±6 kV in common mode Using DC power modules: ±1 kV in differential mode, ±2 kV in common mode
Dimensions (H x W x D)	44.4 mm x 442.0 mm x 220.0 mm (1.75 in. x 17.4 in. x 8.7 in.)
Weight (with packaging)	5.2 kg (11.47 lb)
Stack ports	Any 10GE SFP+ ports (a maximum of 16 physical ports) Any 40GE QSFP+ ports (a maximum of 2 physical ports)
RTC	Supported
RPS	Not supported
PoE	Not supported
Rated voltage range	100 V AC to 240 V AC, 50/60 Hz -48 V DC to -60 V DC
Maximum voltage range	90 V AC to 264 V AC, 47 Hz to 63 Hz -36 V DC to -72 V DC
Maximum power consumption (100% throughput, full speed of fans)	126.3 W
Typical power consumption (30% of traffic load, tested according to ATIS standard)	101.31 W
Operating temperature	0°C to 45°C (32°F to 113°F) at an altitude of 0-1800 m (0-5906 ft.) NOTE: When the altitude is 1800-5000 m (5906-16404 ft.), the highest operating temperature reduces by 1°C (1.8°F) every time the altitude increases by 220 m (722 ft.).
Storage temperature	-40°C to +70°C (-40°F to +158°F)
Noise under normal temperature (27°C, sound power)	< 67.1 dB(A)
Relative humidity	5% to 95%, noncondensing
Operating altitude	AC power modules configured: 0-5000 m (0-16404 ft.) DC power modules configured: 0-2000 m (0-6562 ft.)
Certification	EMC certification Safety certification Manufacturing certification
Part number	02350MTS