What is the power difference between S6720-30C-EI-24S-AC and S6720-30C-EI-24S-DC?

S6720-30C-EI-24S-AC power is 600W, while S6720-30C-EI-24S-DC power is 350W.

Yes, Huawei S6720-30C-EI-24Sswitch supports one extended slot for 4x40GE QSFP+ interface card, it named Huawei ES5D21Q04Q01

Huawei S5700-28P-PWR-LI only can be equipped with AC 110V-220V power supply.Only Huawei S5720-28X-PWR-SI, S5720-52X-PWR-SI, S5720-36C-PWR-EI, S5720-56C-PWR-EI can support Huawei PDC-650WA-BE (650W DC PoE module)

Take the Huawei S2700-9TP-SI-AC for example:
After the VLAN translation function is enabled for the Huawei S2700 switch, the 128 module problem exists because the chip difference supports only 128 VLAN TO VLAN entries.
The packets received through the port are processed as the VLAN smaller than 128. The calculation method is (vlanid)%128.
Therefore, for a VLAN greater than 128, port vlan-mapping vlan id map-vlan id, that is, the mapping from the VLAN to the same VLAN, must be configured for the transparent transmission to be implemented.
More related:
Huawei S2700-9TP-EI-AC
Huawei S2700-9TP-EI-DC
Huawei S2700-9TP-PWR-EI

When using Huawei power supply units, Huawei fixed switches supports 110 V AC input power. The power consumption of most powered devices (PDs) is 4 W to 5 W; therefore, 250 W and 500 W power supply units can provide sufficient PoE power for PDs.
NOTE:
All fixed PoE switches except the S2700-9TP-PWR-EI, S2750-20TP-PWR-EI-AC, S2750-28TP-PWR-EI-AC, S2751-28TP-PWR-EI-AC, S5700-10P-PWR-LI-AC, S5700-28P-PWR-LI-AC, S5700-28TP-PWR-LI-AC, S5700S-28P-PWR-LI-AC, S5701-28TP-PWR-LI-AC, S5700-52P-PWR-LI-AC, S5700-28X-PWR-LI-AC, and S5700-52X-PWR-LI-AC support double PoE power supply units.

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.
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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.

did you check to see if the SFP is registering on the s3700 switch -- check by running display device. Try it!
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S3700 28TP EI DC Price Buy Huawei S3700 28TP EI switch Huanetwork com

Fixed optical interfaces on the S5700EI, S5700SI, S5710LI, and S5700HI support 100M optical modules, while interfaces on extended front cards do not support 100M optical modules.

In the S5700LI series, only the S5700-28X-LI-24S-AC, S5701-28X-LI-24S-AC, S5700-52XLI- 48CS-AC, and S5700-28X-LI-24S-DC support 100M optical modules on their GE interfaces.

The S5710EI series switches support 100M optical modules only on their combo interfaces.

When a GE optical interface of the S5700 works at 1000 Mbit/s, it can only use a 1000M optical module. When the interface works at 100 Mbit/s, it can use either a 100M optical module or a 1000M optical module.
Hope can help you!
S5700 28C PWR SI Price Buy Huawei S5700 28C PWR switch Huanetwork com