Ethernet 100 Mbit/s
Ethernet 10/100 Mbit/s is a local-area technology, with networks traditionally operating within a single building (such as a central office), connecting devices in close proximity. Since Ethernet devices might have up to 100 meters of cable between them, protection standards are those corresponding to intrabuilding applications.
The ETP01 series of protection devices is dedicated to Ethernet 10/100Mbit/s.
Crowbar versus clamping
As the Ethernet protection is located between the RJ45 and the transformer, there is no DC current, and crowbar protection can be used to carry high surge currents without risking latch-up.
There are two alternatives, either use clamping devices such as the LC03, or crowbar devices such as ST’s ETP01 or TPN3021.
The main difference can be seen on the peak voltage, as the clamping devices limit the surge to 15 or 20 V during the surge, while crowbar devices short circuit to a few volts once the breakover voltage is reached.
The benefit of the crowbar solution is the surge current capability, that keeps the capacitance low enough to be compliant with 100 Mbit/s data rates.
Applications
This series meets subscriber and central office requirements.
Protection against telecommunications surge standards on:
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10/100 Mbit/s Ethernet
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Ethernet gigabit links |
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T1/E1 line cards |
