What is the latest version I can put on a Quidway S2700-52P-EI-AC switch

https://e.huawei.com/en/related-page/products/enterprise-network/switches/campus-switches/S6700/brochure/switches-s6700

http://www.router-switch.com/pdf/s6700-48-ei-datasheet.pdf

This two model switches although have the same port, but there is difference as below:

1, forwarding performance S6720-30C-EI-24S is 720Mps, S6720S-26Q-EI-24S is 480Mps

2, S6720–30C-EI-24S supports dual power AC/DC, and extend slot, which S6720S-26Q-EI-24S not suppot.

Yes, the S5700-SI PWR complies with IEEE 802.3af and 802.3at (PoE+)
And Huawei S5700 Series Enterprise Switches provides LI (Lite), SI (Standard), EI (Enhanced) and HI (Hyper) models for users. There are some differences among these four versions.
Click this PDF to know more
Comparison of Huawei S5700-LI, SI, EI and HI Series Switches.pdf
Source:S5700-24TP-PWR-SI-AC

Fixed Switches Product Series Model AC and DC Power Module Mixing S3700/S5700/S6700 S3700-26C-HI Supported S5710-28C-EI Supported S5710-52C-EI Supported S5700-28C-HI Supported S5700-28C-HI-24S Supported S5700-EI (non-PoE) Supported in V200R005 S5700-SI (non-PoE) Supported in V200R005 S6700 Supported in V200R005 S5710-HI AC and DC power modules cannot be used together, but 350 W and 1150 W AC power modules can be used in one switch. S5720-HI Supported Modular Switches · When a switch does not use a PoE power module:
AC and DC power modules cannot be used together in the same type of power slots. Power modules with different power values cannot be used together either.
·
· When a switch uses a PoE power module:
Version PoE Power Module System Power Module V200R005C00 and earlier versions AC AC DC power module not supported - V200R006C00 and later versions AC AC DC DC AC DC ·
AC and DC power modules cannot be installed in the slots of the same type (system or PoE) in the same switch, and the power modules of different power values cannot be used in the same switch.
·


S5720 Switch Thunder link com

An ES5D000X4S01 subcard can be installed in the front card slot of the following S5700 models: S5700-28C-SI, S5700-52C-SI, S5700-28C-EI, S5700-52C-EI, S5700-28C-PWR-EI, S5700-52C-PWR-EI and S5700-28C-EI-24S.
An ES5D000X4S01 subcard can be used on a switch only when the switch and its rear subcard ES5D00ETPB00 run the PCB versions. If the PCB version of the switch or ES5D00ETPB00 is not listed in the table, interfaces on the subcard cannot go Up.

Huawei S2300/3300/5300 series switch although no H3C switches am user-bind command, but through the DHCP Snooping function can also be realized IP+MAC+ port binding to prevent users set up a static IP address. For example, if the request port Ethernet0/0/1 in addition to the static IP address for the 1.1.1.2, MAC address for the 001c-2309-9aa7 corresponding to the user, all other static IP users can not access the internet. Configuration is as follows:
Configure the device DHCP Snooping
# enable the global DHCP Snooping function.
[Quidway] DHCP snooping enable
# configure user side interface of VLAN.
[Quidway] VLAN 100
[Quidway-vlan100] quit
[Quidway] interface Ethernet 0/0/1
[Quidway-Ethernet0/0/1] port default VLAN 100
[Quidway-Ethernet0/0/1] quit
# enable VLAN DHCP Snooping function.
[Quidway] VLAN 100
[Quidway-vlan100] DHCP snooping enable
# configuration interface for packet inspection at the user side
[Quidway] interface Ethernet 0/0/1
[Quidway-Ethernet0/0/1] DHCP snooping check ARP enable
[Quidway-Ethernet0/0/1] DHCP snooping check IP enable
[Quidway-Ethernet0/0/1] quit
# configuration static binding table entry
[Quidway] VLAN 100
[Quidway-vlan100] DHCP snooping bind-table static IP-address 1.1.1.2 mac-address 001c-2309-9aa7 interface Ethernet 0/0/1

did you check to see if the SFP is registering on the s3700 switch -- check by running display device. Try it!
Want to know more information about the S3700-28TP-EI, please visit:
S3700 28TP EI DC Price Buy Huawei S3700 28TP EI switch Huanetwork com