What is the difference between Pulian sg 1005d and Mercury sg 105d?

The two routers you have, Pulian 1005D and Mercury 105D, are different in design and function, which may be one of the reasons for the volume difference. According to the information obtained from Zhongguancun Online, Pulian TL-SG 1005D is described as a full Gigabit switch without network management, with five adaptive RJ45 ports of10/1000 Mbps, all of which support line speed forwarding and MDI/MDIX automatic rollover functions, plug and play. In addition, it also supports MAC address self-learning and full-duplex working mode, which conforms to IEEE 802.3, IEEE 802.3u, IEEE 802.3ab and IEEE 802.3x network standard 2 3.

As for the "4+ 1 port" you said, it may mean that there are five ports in the TL-SG 1005D, of which four ports are used for equipment connection and 1 port is used for power input. This design is common in switches and aims to provide more network connection options.

Regarding the detailed information of Mercury SG 105D, I didn't find a direct comparison with Pulian TL-SG 1005D, but I can infer that the design concept, internal components and functions of the two products may be different, which may be the reason for the volume difference. Usually, the increase in volume may be related to more cooling space, more interfaces or more complicated internal design.

Generally speaking, the volume increase of PL TL-SG 1005D may be due to its more functions and/or more complicated internal structure to meet higher performance requirements.