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S2700 Series Switches Hardware Description

This document provides an overall description of the S2700 hardware, helping you obtain detailed information about each chassis, cable, and optical module.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
S2750-28TP-EI-AC

S2750-28TP-EI-AC

Version Mapping

Table 4-123 lists the mapping between the S2750-28TP-EI-AC chassis and software versions.

Table 4-123 Version mapping

Series

Model

Software Version
S2750-EI S2750-28TP-EI-AC

V200R003C00 to V200R012C00 versions

NOTE:

This model does not match V200R003C02, V200R003C10, V200R005C00SPC500, V200R005C01, V200R005C02, V200R006C10, and V200R007C10.

Appearance and Structure

Figure 4-50 S2750-28TP-EI-AC appearance
1 Twenty-four 10/100BASE-TX ports 2 Two 1000BASE-X ports
3 Two combo ports (10/100/1000BASE-T + 100/1000BASE-X) 4 One console port
5 Ground screw
NOTE:
It is used with Ground cable.
6 AC socket
NOTE:

It is used with AC Power Cable.

7 Jack reserved for AC power cable locking strap
NOTE:
The AC power cable locking strap is not delivered with the switch.
- -

Port Description

10/100BASE-TX port
A 10/100BASE-TX Ethernet electrical port sends and receives service data at 10/100 Mbit/s, and must use an Ethernet cable. Table 4-124 lists the attributes of a 10/100BASE-TX Ethernet electrical port.
Table 4-124 Attributes of a 10/100BASE-TX Ethernet electrical port

Attribute

Item

Connector type

RJ45

Standards compliance

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

Electrical port attributes

MDI/MDIX

NOTE:
  • A medium dependent interface (MDI) provides the physical and electrical connection to the cabling medium. Ethernet ports of most NICs are MDIs.
  • A medium dependent interface crossover (MDIX) enables connection between like devices. MDIX ports are usually used on hubs or LAN switches.

Working mode

10/100 Mbit/s auto-sensing

Maximum transmission distance

100 m

1000BASE-X port
A 1000BASE-X Ethernet optical port sends and receives service data at 1000 Mbit/s. Table 4-125 describes the attributes of a 1000BASE-X Ethernet optical port.
Table 4-125 Attributes of a 1000BASE-X Ethernet optical port

Attribute

Description

Connector type

LC/PC

Optical port attributes

Depend on the optical module used

Standards compliance

IEEE802.3z

Working mode

1000 Mbit/s

Combo port
A combo port consists of an optical Ethernet port and an electrical Ethernet port on the panel. Each combo port matches only one internal forwarding port. The electrical and optical ports of a combo port are multiplexed, and only one of them can work at a time. When one of the Ethernet ports is working, the other port is shut down.
NOTE:

By default, a combo port works in auto mode, in which the port type is determined as follows:

  • If the optical port has no optical module installed and the electrical port has no Ethernet cable connected, the port type depends on which port is connected first. If the electrical port is connected by an Ethernet cable first, the electrical port is used for data switching. If the optical port has an optical module installed first, the optical port is used for data switching.
  • If the electrical port has an Ethernet cable connected and is in Up state, the electrical port is still used for data switching when the optical port has an optical module installed.
  • If the optical port, no matter in Up or Down state, has an optical module installed, the optical port is still used for data switching when the electrical port has an Ethernet cable connected.
  • If the optical port has an optical module installed and the electrical port has an Ethernet cable connected, the optical port is used for data switching after the switch restarts.
You can configure a combo port as an electrical or optical port using the combo-port command.
Console port
The console port of a switch can connect to an operation terminal for onsite configuration. The port must use Console Cable. To configure a switch after the first power-on, log in to the switch through the console port. Table 4-126 lists attributes of a console port.
Table 4-126 Attributes of a console port

Attribute

Item

Connector type

RJ45

Standards compliance

RS-232

Working mode

Full-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

Indicator Description

NOTE:
For switches running V200R007C00 and later versions or the S2720-28TP-EI-AC running V200R006C10, you can hold down this button for 6s and release it to start the web initial login mode:
  • If the switch has no configuration file, the system attempts to enter the web initial login mode. In this mode, the status of mode indicators is as follows:
    • If the system enters the web initial login mode successfully, all mode indicators turn green and stay on for a maximum of 10 minutes.
    • If the system fails to enter the initial login mode, all mode indicators fast blink for 10 seconds and then restore to the default status.
  • If the switch has a configuration file, the system cannot enter the web initial login mode. In this case, all mode indicators fast blink for 10s, and then return to the default states.
Figure 4-51 Indicators on the S2750-28TP-EI-AC

Table 4-127 Description of indicators on the switch
No. Indicator Name Color Status Description
1 PWR Power module indicator - Off The switch is powered off.
Green Steady on The system power supply is normal.
2 SYS System status indicator - Off The system is not running.
Green Fast blinking The system is starting.
Green Slow blinking The system is running normally.
Red Steady on The system does not work normally after registration, or a fan alarm or temperature alarm has been generated.
3 STAT Status indicator - Off The status mode is not selected.
Green Steady on The status mode (default mode) is selected. If the status mode is selected, the service port indicator shows the port link or activity state.
4 STCK Stack indicator - Off
  • If you are not changing the indicator mode (default): The switch is in stack standby or slave state or the stacking function is not enabled on the switch.
  • If you are changing the indicator mode: The stack mode is not selected.
Green Steady on The switch is a standby or slave switch in a stack, and the service port indicators show the stack ID of the switch.
Green Blinking
  • If you are not changing the indicator mode (default): The switch is a stack master switch or a standalone switch with the stacking function enabled.
  • If you are changing the indicator mode: The switch is the master switch in a stack or a standalone switch, and the service port indicators show the stack ID of the master switch.
After 45 seconds, the service port indicators automatically restore to the status mode.
5 MODE Mode switch button - -
  • When you press this button once, the service port indicators change to the stack mode and show the stack ID of the local switch.
  • When you press this button a second time, the service port indicators restore to the default mode, and the STAT indicator turns green.

If you do not press the MODE button within 45 seconds, the service port indicators restore to the default mode. In this case, the STAT indicator is steady green, and the STCK indicator is off or blinking green.

6 - Service port indicator

Meanings of service port indicators vary in different modes. For details, see Table 4-128.

Table 4-128 Description of service port indicators in different modes

Display Mode

Color

Status

Description

Status

-

Off

No link has been established to the port or the port has been shut down.

Green

Steady on A link is established on the port.
Blinking The port is sending or receiving data.

Stack

-

Off

Port indicators do not show the stack ID of the switch.

Green

Steady on
The switch is not the master switch in a stack.
  • If the indicator of a port is steady on, the number of this port is the stack ID of the switch.

  • If the indicators of ports 1 to 9 are steady on, the stack ID of the switch is 0.

Blinking
The switch is the master switch in a stack.
  • If the indicator of a port is blinking, the number of this port is the stack ID of the switch.

  • If the indicators of ports 1 to 9 are blinking, the stack ID of the switch is 0.

Power Supply Configuration

The S2750-28TP-EI-AC has a built-in power module and does not support pluggable power modules.

Figure 4-52 shows the power supply mode of a built-in AC power module. The built-in AC power module (PWR) receives power from an external power source and provides a 12 V output to the chassis.
Figure 4-52 Power supply mode of a built-in AC power module

L: live wire

N: neutral wire

PGND: protection ground

GND: 12 V reference ground

Heat Dissipation

The S2750-28TP-EI-AC has no fans and uses natural heat dissipation.

Technical Specifications

Table 4-129 lists technical specifications of the S2750-28TP-EI-AC.

Table 4-129 Technical specifications

Item

Description

Memory (RAM)

256 MB

Flash

200 MB

Mean time between failures (MTBF)

44.3 years

Mean time to repair (MTTR)

2 hours

Availability

> 0.99999

Service port surge protection

Common mode: ±6 kV

Power supply surge protection

±6 kV in differential mode, ±6 kV in common mode

Dimensions (H x W x D)

43.6 mm x 442.0 mm x 220.0 mm (1.72 in. x 17.4 in. x 8.7 in.)

Weight (with packaging)

3 kg (6.62 lb)

Stack ports

Two uplink 1000BASE-X optical ports

RTC

Not supported

RPS

Not supported

PoE

Not supported

Rated voltage range

100 V AC to 240 V AC, 50/60 Hz

Maximum voltage range

90 V AC to 264 V AC, 47 Hz to 63 Hz

Maximum power consumption (100% throughput)

15.7 W

Typical power consumption (30% of traffic load)
  • Tested according to ATIS standard
  • No PoE power consumption

15.5 W

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 between 1800 m (5906 ft.) and 5000 m (16404 ft.), the highest operating temperature reduces by 1°C (1.8°F) every time the altitude increases by 220 m (722 ft.).

The operating temperature of the switch is -5°C to +45°C (23°F to 113°F) when it uses SFP optical modules with 80 km or longer transmission distances.

Storage temperature

-40°C to +70°C (-40°F to +158°F)

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

Noise-free (no fans)

Relative humidity

5% to 95%, noncondensing

Operating altitude

0-5000 m (0-16404 ft.)

Certification

  • EMC certification
  • Safety certification
  • Manufacturing certification

Part number

02355247
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Updated: 2019-08-19

Document ID: EDOC1000027458

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