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S6700 Series Switches Hardware Description

This document provides an overall description of the S6700 hardware, helping you obtain detailed information about each chassis, power module, fan module, cable, and optical module.

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S6720-56C-PWH-SI-AC

S6720-56C-PWH-SI-AC

Version Mapping

Table 5-106 lists the mapping between the S6720-56C-PWH-SI-AC chassis and software versions.

Table 5-106 Version mapping

Series

Model

Software Version

S6720-SI

S6720-56C-PWH-SI-AC

V200R011C10 and later versions

Appearance and Structure

Figure 5-46 S6720-56C-PWH-SI-AC appearance

1

Thirty-two PoE++ 10/100/1000BASE-T ports

2

Sixteen PoE++ 100M/1000M/2.5GE/5GE/10GE BASE-T ports (MultiGE port)

3

Four 10GE SFP+ ports

NOTE:

The four 10GE SFP+ ports on the front panel cannot be used simultaneously with ports on the rear card (except the 4-port 10GE rear card).

If a rear card other than a 4-port 10GE rear card is installed in the switch, only the ports on the front panel can be used by default.
  • V200R011 version: To use the port on the rear card, run the set device port-on-card enable command. Then the four 10GE SFP+ ports on the front panel cannot be used.
  • V200R012 and later versions: To use the port on the rear card, run the undo set device port-config-mode port-on-board enable command. Then the four 10GE SFP+ ports on the front panel cannot be used.

4

One ETH management port

5

One PNP button

NOTICE:

Applicable in V200R012C00 and later versions:

To restore the factory settings and reset the switch, hold down the button for at least 6 seconds.

To reset the switch, press the button.

Resetting the switch will cause service interruption. Exercise caution when you press the PNP button.

6

One console port

7

One USB port

8

Ground screw

NOTE:
It is used with a ground cable.

9

ESN label

NOTE:

You can draw it out to view the ESN and MAC address of the switch.

10

Rear card slot

NOTE:
Cards supported:

11

Fan slot

NOTE:

Applicable fan module: FAN-060B-B

12

Power module slot 2

NOTE:
Applicable power modules:

13

Power module slot 1

NOTE:
Applicable power modules:

-

-

Interface Description

10/100/1000BASE-T port

A 10/100/1000BASE-T Ethernet electrical port sends and receives service data at 10/100/1000 Mbit/s, and must use an Ethernet cable. Table 5-107 describes the attributes of a 10/100/1000BASE-T Ethernet electrical port.
Table 5-107 Attributes of a 10/100/1000BASE-T Ethernet electrical port

Attribute

Description

Connector type

RJ45

Standards compliance

IEEE802.3, IEEE802.3u, IEEE802.3ab

Working mode

10/100/1000 Mbit/s auto-sensing

Maximum transmission distance

100 m

100M/1000M/2.5GE/5GE/10GE BASE-T port (MultiGE port)

A 100M/1000M/2.5GE/5GE/10GE BASE-T port (MultiGE port) sends and receives service data at 100 Mbit/s, 1 Gbit/s, 2.5 Gbit/s, 5 Gbit/s, or 10 Gbit/s, and must use an Ethernet cable. If the 2.5 Gbit/s, 5 Gbit/s, or 10 Gbit/s speed is required, the port must use an Ethernet cable of Cat5e or higher category. Table 5-108 describes the attributes of a 100M/1000M/2.5GE/5GE/10GE BASE-T port.
Table 5-108 Attributes of a 100M/1000M/2.5GE/5GE/10GE BASE-T port

Attribute

Description

Connector type

RJ45

Standards compliance

IEEE802.3u, IEEE802.3ab, IEEE802.3bz, IEEE802.3an, mgbase-t

Working Mode

100/1000/2500/5000/10000 Mbit/s auto-sensing

Table 5-109 lists the maximum transmission distances of different cables on MultiGE ports.
Table 5-109 Maximum transmission distances of different cables on MultiGE ports

Cable Type (6-a-1 Bundle)

MultiGE Port (Different Rates)

16 x 100M/1000M

16 x 2.5GE

16 x 5GE

16 x 10GE

Category 5e unshielded twisted pair (Cat5e UTP)

100 m

100 m

  • 55 m
  • 100 m (6-a-1 bundle only for the first 30 m)

Not recommended due to high risk

Not supported

Category 5e shielded twisted pair (Cat5e STP)

100 m

100 m

100 m

Not supported

Category 6 unshielded twisted pair (Cat6 UTP)

100 m

100 m

100 m

Not recommended due to high risk

Not supported

Category 6 shielded twisted pair (Cat6 STP)

100 m

100 m

100 m

Not supported

Category 6A unshielded twisted pair (Cat6A U/UTP)

100 m

100 m

100 m

Not recommended due to high risk

Not supported

Category 6A foiled/unshielded twisted pair (Cat6A F/UTP)

100 m

100 m

100 m

100 m

Category 6A shielded twisted pair (Cat6A STP)

100 m

100 m

100 m

100 m

Category 7 twisted pair (Cat7)

100 m

100 m

100 m

100 m

6-a-1 stands for the six-around-one cable bundle mode, with one cable in the center and six cables bundled evenly around it.

Some cables pose high risks and are not recommended for the following reasons:
  • 802.3bz requires that the ALSNR value for alien crosstalk between Ethernet cables be greater than 0, but the standards for Cat5e and Cat6 unshielded twisted pairs do not specify the required ALSNR value. Therefore, such cables may not meet the crosstalk requirement in 802.3bz, causing severe problems such as continuous packet loss.
  • According the cabling specification TIA TSB-5021, using Cat5e and Cat6 cables for 5G poses high risks.
  • Currently, no clear onsite testing or evaluation method is available for checking whether ALSNR of cables conforms to 802.3bz.

If Cat5e and Cat6 unshielded twisted pairs do not meet the 5G requirement, you are advised to replace them with shielded twisted pairs or reduce the rate of interfaces to 2.5G.

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 5-110 describes the attributes of a 10GE SFP+ Ethernet optical port.
Table 5-110 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

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 5-111.
Table 5-111 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 5-112 describes the attributes of an ETH management port.
Table 5-112 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 S6720-56C-PWH-SI-AC has the same types of indicators as the S6720-32C-PWH-SI-AC. For details, see Indicator Description.

Power Supply Configuration

The S6720-56C-PWH-SI-AC is a PoE switch. It provides two power module slots, each supporting a 580 W, 650 W, or 1000 W (applicable in V200R013C00 and later versions) power module. A 580 W AC power module and a 650 W DC power module can be used together. A 580 W AC power module and a 1000 W AC power module can be used together. Table 5-113 lists its power supply configurations.

Table 5-113 Power supply configurations

Power Module 1

Power Module 2

Available PoE Power

Maximum Number of Ports (Fully Loaded)

580 W or 650 W

369.6 W

  • 802.3af (15.4 W per port): 24
  • 802.3at (30 W per port): 12
  • 802.3bt (60 W per port): 6

580 W or 650 W

580 W or 650 W

739.2 W

  • 802.3af (15.4 W per port): 48
  • 802.3at (30 W per port): 24
  • 802.3bt (60 W per port): 12

1000 W (220 V)

-

754.6 W

  • 802.3af (15.4 W per port): 48
  • 802.3at (30 W per port): 25
  • 802.3bt (60 W per port): 12

1000 W (220 V)

1000 W (220 V)

1440 W

  • 802.3af (15.4 W per port): 48
  • 802.3at (30 W per port): 48
  • 802.3bt (60 W per port): 24

1000 W (110 V)

-

754.6 W

  • 802.3af (15.4 W per port): 48
  • 802.3at (30 W per port): 25
  • 802.3bt (60 W per port): 12

1000 W (110 V)

1000 W (110 V)

1440 W

  • 802.3af (15.4 W per port): 48
  • 802.3at (30 W per port): 48
  • 802.3bt (60 W per port): 24

1000 W

580 W

739.2 W

  • 802.3af (15.4 W per port): 48
  • 802.3at (30 W per port): 24
  • 802.3bt (60 W per port): 12

580 W

1000 W

739.2 W

  • 802.3af (15.4 W per port): 48
  • 802.3at (30 W per port): 24
  • 802.3bt (60 W per port): 12

When a switch has two power modules installed, the two power modules work in redundancy mode to provide power for the chassis and in load balancing mode to provide power for PDs.

Figure 5-47 shows the power supply mode of dual AC PoE power modules (PWR1 and PWR2). After AC power is transmitted to the PWR modules, the PWR modules provide 12 V and -53 V outputs. The outputs are combined on the motherboard, which then provides 12 V voltage for the switch and -53 V voltage for the PDs.
Figure 5-47 Power supply by dual AC PoE power modules

L: live wire

N: neutral wire

PGND: protection ground wire

GND: 12 V reference ground

RTN: -53 V reference ground

Figure 5-48 shows the power supply connections of dual DC PoE power modules. After DC power is transmitted to the PWR module, the PWR module provides 12 V and -53 V output voltages, and the motherboard provides 12 V voltage for the entire device and -53 V voltage for the PDs.
Figure 5-48 Power supply connections of dual DC PoE power modules

NEG: negative wire

RTN: positive wire

GND: 12 V reference ground

RTN: -53 V reference ground

Heat Dissipation

The S6720-56C-PWH-SI-AC uses pluggable fan modules for forced air cooling. Air flows in from the left, right, and front sides, and exhausts from the rear panel.

This figure only shows the airflow direction and does not depict the actual device.

Technical Specifications

Table 5-114 lists technical specifications of the S6720-56C-PWH-SI-AC.

Table 5-114 Technical specifications

Item

Description

Memory (RAM)

1 GB

Flash

512 MB in total. To view the available flash memory size, run the display version command.

Mean time between failures (MTBF)

23.9 years

Mean time to repair (MTTR)

2 hours

Availability

> 0.99999

Service port surge protection

Common mode: ±6 kV

Power supply surge protection

  • Using 580 W AC or 1000 W AC power modules: ±6 kV in differential mode, ±6 kV in common mode
  • Using 650 W DC power modules: ±2 kV in differential mode, ±4 kV in common mode

Dimensions (H x W x D)

44.4 mm x 442.0 mm x 420.0 mm (1.75 in. x 17.4 in. x 16.5 in.)

Weight (with packaging)

9.3 kg (20.5 lb)

Stack ports

Any MultiGE, 10GE SFP+, or 40GE QSFP+ ports (a maximum of 16 physical ports)

RTC

Supported

RPS

Not supported

PoE

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

-38.4 V DC to -72 V DC

Maximum power consumption (100% throughput, full speed of fans)

  • Using 650 W DC power modules or 580 W AC power modules
    • Not providing the PoE function: 120.5 W (without card)
    • 100% PoE loads: 1068.1 W (system power consumption: 328.9 W, PoE: 739.2 W, without card)
  • Using 1000 W AC power modules
    • Not providing the PoE function: 120.5 W (without card)
    • 100% PoE loads: 1995.4 W (system power consumption: 555.4 W, PoE: 1440 W, without card)

Typical power consumption (30% of traffic load, tested according to ATIS standard)

91.01 W (not providing the PoE function, without card)

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.).

Short-term operating temperature

-5°C to +50°C (23°F to 122°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.).

The equipment can operate beyond the normal operating temperature range for a short-term period, but the following conditions must be met:
  • The equipment operates at a temperature of over 45°C (113°F) consecutively for at most 96 hours in one year.
  • The equipment operates at a temperature of over 45°C (113°F) for a total of no more than 360 hours in one year.
  • The equipment operates at a temperature of over 45°C (113°F) for no more in 15 times in one year.
The equipment may be damaged or experience unexpected exceptions if any of the preceding limits is exceeded.

The equipment cannot start when the temperature is lower than 0°C (32°F). The maximum distance of optical modules used in these conditions cannot exceed 10 km.

Storage temperature

-40°C to +70°C (-40°F to +158°F)

Noise under normal temperature (27°C, sound power)

< 60.5 dB(A)

Relative humidity

5% to 95%, noncondensing

Operating altitude

0-5000 m (0-16404 ft.)

Certification

  • EMC certification
  • Safety certification
  • Manufacturing certification

Part number

98010727

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Updated: 2020-02-17

Document ID: EDOC1000013621

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