S2750-28TP-PWR-EI-AC - S2700 Series Switches Hardware Description

S2700 Series Switches Hardware Description

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S2750-28TP-PWR-EI-AC

Version Mapping

Table 4-136 lists the mapping between the S2750-28TP-PWR-EI-AC chassis and software versions.

Table 4-136 Version mapping

Series	Model	Software Version
S2750-EI	S2750-28TP-PWR-EI-AC	V200R003C00 to V200R012C00 versions NOTE: This model does not match V200R003C02, V200R003C10, V200R005C00SPC500, V200R005C01, V200R005C02, V200R006C10, and V200R007C10.

Appearance and Structure

Figure 4-56 S2750-28TP-PWR-EI-AC appearance

1	Twenty-four PoE+ 10/100BASE-TX ports	2	Two 1000BASE-X ports Applicable modules: GE optical module GE-CWDM optical module GE-DWDM optical module GE copper module (works at 10 Mbit/s, 100 Mbit/s, or 1000 Mbit/s) Stack optical module (only used for stack connection) 1 m and 10 m SFP+ copper cables (only used for stack connection) 3 m and 10 m AOC cables (only used for stack connection) 0.5 m and 1.5 m SFP+ dedicated stack copper cables (used for zero-configuration stacking, supported in V200R011C10 and later versions)
3	Two combo ports (10/100/1000BASE-T + 100/1000BASE-X) Modules applicable to combo optical ports: FE optical module GE optical module GE-CWDM optical module GE-DWDM optical module	4	One console port
5	Ground screw NOTE: It is used with Ground cable.	6	Jack reserved for AC power cable locking strap NOTE: The AC power cable locking strap is not delivered with the switch.
7	AC socket NOTE: It is used with AC Power Cable.	-	-

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 4-137 lists the attributes of a 10/100BASE-TX Ethernet electrical port.

Table 4-137 Attributes of a 10/100BASE-TX Ethernet electrical port

Attribute	Item
Connector type	RJ45
Standards compliance	IEEE802.3, IEEE802.3u, IEEE802.3ab
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 4-138 describes the attributes of a 1000BASE-X Ethernet optical port.

Table 4-138 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.

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 4-139 lists attributes of a console port.

Table 4-139 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

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 4-57 S2750-28TP-PWR-EI-AC appearance

Table 4-140 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.
			Yellow or red	Steady on	The built-in power module has failed.
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.
3	STAT	Status indicator	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	PoE	PoE indicator	-	Off	The PoE mode is not selected.
5	PoE	PoE indicator	Green	Steady on	The service port indicators show the PoE status. After 45 seconds, the service port indicators automatically restore to the status mode.
6	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 change to the PoE mode and show the PoE status of each service port. When you press this button a third 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, the PoE indicator is off, and the STCK indicator is off or blinking green.
7	-	Service port indicator	Meanings of service port indicators vary in different modes. For details, see Table 4-141.

Table 4-141 Description of service port indicators in different modes (one indicator for each port)

Display Mode	Color	Status	Description
Status	-	Off	The port is not connected or has been shut down.
	Green	Steady on	A link has been established on the port.
	Green	Blinking	The port is sending or receiving data.
PoE	-	Off	The port is not providing power to a powered device (PD).
	Green	Steady on	The port is providing power to a PD.
	Yellow	Steady on	The PoE function is disabled on the port.
	Yellow	Blinking	The port stops providing PoE power because of an exception (for example, an incompatible PD is connected to the port).
	Green and yellow	Blinking green and yellow alternately	The port fails to supply power to a PD due to one of the following reasons: The power required by the connected PD exceeds the maximum power or the configured power threshold of the port. The total power consumption of PDs has reached the maximum power of the switch. The manual power management mode is used and the port is not enabled to provide power to the PD.
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.
	Green	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-PWR-EI-AC has a built-in power module and does not support pluggable power modules.

The built-in power module can provide 370 W PoE power, which ensures full PoE power on 24 ports in compliance with 802.3af or on 12 ports in compliance with 802.3at.

Figure 4-58 shows the power supply mode of a built-in AC PoE power module (PWR). The PWR module receives AC power from an external power source and provides two outputs: 12 V and -53 V. The 12 V output is provided for the chassis, and the -53 V output is provided for PDs.

Figure 4-58 Power supply by a built-in AC PoE power module

L: live wire

N: neutral wire

PGND: protection ground wire

GND: 12 V reference ground

RTN: -53 V reference ground

Heat Dissipation

The S2750-28TP-PWR-EI-AC has two built-in fans for forced air cooling. The airflow direction is left-to-right.

Click to enlarge

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

Technical Specifications

Table 4-142 lists technical specifications of the S2750-28TP-PWR-EI-AC.

Table 4-142 Technical specifications

Item	Description
Memory (RAM)	256 MB
Flash	200 MB
Mean time between failures (MTBF)	78.29 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 310.0 mm (1.72 in. x 17.4 in. x 12.2 in.)
Weight (with packaging)	4.5 kg (9.92 lb)
Stack ports	Two uplink 1000BASE-X optical ports
RTC	Not supported
RPS	Not supported
PoE	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, 100% PoE loads, full speed of fans)	445 W (system power consumption: 75 W, PoE: 370 W)
Typical power consumption (30% of traffic load) Tested according to ATIS standard No PoE power consumption	23.83 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.).
Storage temperature	-40°C to +70°C (-40°F to +158°F)
Noise under normal temperature (27°C, sound power)	< 52 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	02355243

Indicator Description

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Updated: 2023-10-23

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