16-channel LAN network protection with passive PoE input, PTF-516R-EXT/InPoE/P

PTF-516R-EXT/InPoE/P is a 16-channel surge protection device designed to protect 100Mbit LAN networks in industrial automation systems, building automation, and IP-CCTV industrial television installations. It provides highly effective protection for data transmission lines while also delivering PoE power of up to 15W/channel in passive mode.

By increasing the supply voltage to 56V, it is possible to transmit up to 20W per channel. The maximum power mentioned is due to the simple PoE implementation (without negotiation circuit) and a 350mA automatic fuse. Passive power transmission above 15W @ 48V is not recommended, as damage to the cable or errors in connections can cause damage to the LAN ports of end devices. For power transmission up to 30W/port, we recommend using the PTF-516R-EXT/InPoE/A module, which includes an active PSE negotiation circuit.

The product can be used with a LAN switch that does not have PoE ports or can be used to increase the number of PoE ports in case of insufficient power or number of PoE ports in the LAN switch. To power each module, a power supply with a voltage of 48-56VDC and a recommended output of 2A should be used to prevent the power supply from shutting down when the automatic fuse is activated.

Extreme surge protectors are the most effective products designed to protect devices mounted on metal structures and in industrial conditions. They should be used wherever, in addition to the risk of surges, potentials may appear between local grounding points. Such phenomena occur when LAN end devices are mounted on metal structures, such as poles, halls or towers, where a momentary potential difference occurs between them during atmospheric discharge, which can be closed through LAN cables.

The above-mentioned threats also occur in heavy industry or rail transport, where the activation of heavy machinery, generators or UPS units also generates large potential differences.

High impact resistance of up to 2.5kA for each wire with direct charge discharge to the ground prevents damage to electronics due to induction of high energy in wires or spark jumps from other installations. The MOSFET technology used significantly reduces the surge voltage that may occur on the protected side due to the dynamic resistance of silicon components or the operation of the protection at elevated temperatures.

The PTF-516R-EXT/InPoE/P protection is compatible with Ethernet standards 10Base-T and 100Base-T. The complete product consists of the PTU/PTF-5-RACK housing and four PTF-54-EXT/InPoE/P modules. Shielded RJ-45 connectors on the protected and unprotected side facilitate both adaptation to an existing system and servicing.

Optional LK-MOUNT angle brackets allow for mounting the panel at a 45-degree angle on the rear rack rail, which is beneficial for using NVR recorders in CCTV installations. This reduces the length of patch cords and increases the amount of space in the rack.

The best protection efficiency is achieved by using surge protection at both ends of the LAN cable and proper grounding. Usually, a multi-channel protection is used on the LAN switch side and a single-channel protection on the end devices side. In order to balance the surge strength of the entire LAN line on the other side of the cable, a PRO or EXT series limiter should be used. The use of two EXTREME series limiters at both ends of the cable provides the highest level of protection, but increases the series resistance of the circuit, which should be taken into account when measuring and calculating PoE power losses.

PoE transmission takes place on transmission lines 1-2, 3-6, similar to the IEEE standard: 802.3af, option A. Pairs 4-5 and 7-8 are completely disabled inside the device. Built-in PoE power protection protects against power surges or damage to the power supply.

EXT series protectors should not be connected to popular patch panels using LSA (Krone) or Keystone connectors, due to the low surge strength of their printed circuits. It is best to use cables terminated with simple RJ-45 connectors.

The product is tested according to categories D1, C2, C1, B2. It is intended for use at the boundaries of LPZ0/LPZ1 zones or higher.

Example of a complete protection and power supply system for IP cameras using an InPoE panel

Technical specification