Dahua VTNS2003B-2 Two wire switch  The VTNS2003B-2 is a switch for products from the new generation of Dahua Video Intercom products. The communication of this generation of video intercom products uses the SIP protocol. This protocol ensures a good speech-listening connection and offers possibilities for integration with third parties. The 2-wire technology simplifies installation and offers the possibility of connecting multiple op stations to a single cable. Plus points: Multiple devices on one 2-wire connection: It is possible with this generation to serialize multiple products from each other via the "out" port. The switches can also be connected to each other via 2 wires. However, each switch must be supplied with 48VDC separately.  2-wires for one system: Both the power supply for the indoor and outdoor stations and the data transmission goes through the same cable. This allows the stations to be placed on the same line, making 2 wires sufficient for a working system. TCP-IP network protocol: Despite the 2-wire technology, the posts just work as regular network products. This means that each post needs to have its own unique IP address. A big advantage of this is that posts connected to the this 2-wire switch can be combined with the PoE products and the 2-wire products from the previous generation.  Suitable for DMSS and DSS Pro: Because the 2-wire products are simply part of the network, they can also be applied with the DMSS app or DSS Pro management software Points of interest: Not suitable for all 2-wire products: This switch is not suitable for all Dahua 2-wire intercom products. Products from older generations are not supported by this switch Maximum 2 entry panels per switch: A maximum of 2 VTO entry panels can be connected per switch. If there are more entry panels, they must be connected to the next switch. The switches can be interconnected. A maximum of 2 extensions per VTH indoor unit: A maximum of 2 extensions can be added to a VTH indoor unit. Should there be more extensions, it is recommended to connect the VTH with each other via a PoE switch.  VTNS2003-B  With 6 devices or less, a 48VDC power supply of 1.25A is sufficient. For 6 to 22 devices, a 48VDC power supply of 5A is recommended.   Recommendations Recommended cabling: 4x0.5mm² with a maximum resistance of 4Ω per 100 meters. Maximum distance 50 meters  2x0.5mm² with a maximum resistance of 3.9Ω or less per 100meter. Maximum distance 50 meter  UTP Cat5e 0.45mm with a maximum resistance of 12Ω per 100 meters. Maximum distance with 6 VTH is then 50 meters, with 12 VTH it is 30 meters. Slot control by external power supply: The power supply and control of locks and doors could in theory also be done from the switch. However, this may have a negative effect on the operation and mutual communication of the indoor and outdoor units and is therefore not recommended.   

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