S2720-28TP-EI

Version Mapping

Table 1 lists the mapping between the S2720-28TP-EI chassis and software versions.

**Table 1** Version mapping
Series	Model	Software Version
S2720-EI	S2720-28TP-EI	V200R011C10 and later versions

Appearance and Structure

Figure 1 S2720-28TP-EI appearance

1	Sixteen 10/100BASE-TX ports	2	Eight 10/100/1000BASE-T ports
3	Two combo ports (10/100/1000BASE-T + 100/1000BASE-X) Modules applicable to combo optical ports: FE optical module GE optical module (maximum transmission distance ≤ 40 km)	4	Two 1000BASE-X ports Applicable modules and cables: GE optical module (maximum transmission distance ≤ 40 km) GE copper module (10M/100M/1000M auto-sensing) Stack optical module (only used for stack connection) 1 m, 3 m, 5 m, and 10 m SFP+ high-speed 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) H87MMA5671A2 GPON optical module (applicable in V200R012C00 and later versions) NOTE: If a port uses a GPON optical module, other 1000BASE-X optical ports cannot be used.
5	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	Ground screw NOTE: It is used with Ground cable.	8	Jack reserved for AC power cable locking strap NOTE: The AC power cable locking strap is not delivered with the switch.
9	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 2 lists the attributes of a 10/100BASE-TX Ethernet electrical port.

**Table 2** 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

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 3 describes the attributes of a 10/100/1000BASE-T Ethernet electrical port.

**Table 3** 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

Combo port

A combo port refers to a pair of ports consisting of an optical Ethernet port and an electrical Ethernet port on the panel. Each combo port matches only one internal forwarding port. A combo port can be configured as an electrical port or an optical port, but only one port can be active at a time. When one port is active, 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.

1000BASE-X port

When a 1000BASE-X port uses a GE optical module, it can only transmit and receive data at 1000 Mbit/s and does not support the 100 Mbit/s transmission speed. When a 1000BASE-X port uses a GE copper module, it can transmit and receive data at 10 Mbit/s, 100 Mbit/s, or 1000 Mbit/s. Table 4 describes the attributes of a 1000BASE-X Ethernet optical port.

**Table 4** Attributes of a 1000BASE-X Ethernet optical port
Attribute	Description
Connector type	LC/PC
Optical port attributes	Depend on the module used
Standards compliance	IEEE802.3z

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.

**Table 5** 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

Indicator Description

The S2720-28TP-EI has similar indicators to those on the S2720-28TP-PWR-EI, except that the S2720-28TP-EI does not have a PoE mode indicator. For details, see Indicator Description.

Power Supply Configuration

The S2720-28TP-EI has a built-in power module and does not support pluggable power modules.

Figure 2 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 2 Power supply mode of a built-in AC power module

L: live wire

N: neutral wire

PGND: protection ground wire

GND: 12 V reference ground

Heat Dissipation

The S2720-28TP-EI has no fans and uses natural heat dissipation.

Technical Specifications

Table 6 lists technical specifications of the S2720-28TP-EI.

**Table 6** Technical specifications
Item	Description
Memory (RAM)	512 MB
Flash	512 MB in total. To view the available flash memory size, run the display version command.
Mean time between failures (MTBF)	49 years
Mean time to repair (MTTR)	2 hours
Availability	> 0.99999
Service port surge protection	Common mode: ±7 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 (including package)	4 kg (8.82 lb)
Stack ports	Two 1000BASE-X 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)	20.1 W
Typical power consumption (30% of traffic load) Tested according to ATIS standard EEE enabled No PoE power consumption	15.2 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.). The operating temperature of the switch is 0°C to 40°C (32°F to 104°F) when it uses GE SFP optical modules with 40 km transmission distance.
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)	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	98010680