AC-DC power conversion

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The uninterruptible power module (UPM) is a kind of external uninterruptible power module. It can convert 110 V/220 V AC mains power to -48 V DC required for transmission devices. It mainly applies to when no -48 V DC power supply is available or when the telecom operator requests to use a storage battery.

Other related questions:
What's the power cable Requirements for AC/DC power distribution
The conductor in the neutral wire must have the same cross-sectional area as the conductor in the live wire. The DC power feeder should be selected based on the long-term load. If the cross-sectional area exceeds 95 mm2, a hard bus cable should be used. If there is a great difference between the short-term load and the long-term load, cables can be routed by stage. AC/DC conducting wires should be flame-retardant and be routed according to the Code for fire protection design of tall buildings (GB50045-95). Low voltage power distribution rooms should be designed and configured according to the Code for low voltage distribution and circuit design (GBJ54-83).

AC and DC power supply on S series switches
You can check whether an S series switch supports AC or DC power supply based on the following guidelines: 1. Check the switch model. If the model contains AC, the switch supports AC power supply. If the model contains DC, the switch supports DC power supply. 2. Check the power module. Differentiate AC and DC switches based on the power module. Power modules are divided into non-PoE and PoE power modules. You can also use the Hardware Query Tool at Hardware Query Tool.

Does the S12700 support the AC power supply and DC power supply
AC and DC power modules cannot be installed simultaneously in the same type of power slots.

Does the S7700&S9700 support the AC power supply and DC power supply
AC and DC power modules or power modules of different power values cannot be installed simultaneously in the same type of power slots (system or PoE). In versions earlier than V200R006C00, the PoE slots of a switch allow only AC power modules. To use the PoE function on a switch, use AC power modules as the system power modules. In V200R006C00 and later versions, the PoE slots allow both AC and DC power modules.

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