Method for extending ethernet over twisted pair conductors and to the telephone network and plug-in apparatus for same employing standard mechanics
View Patent ↗An Ethernet extension device is provided for metro or last mile Ethernet service via twisted pairs as opposed to fiber optics. The Ethernet extension device is implemented as a plug-in extension for existing infrastructure (e.g., in a standard electrical wall box or Type-200™ Mechanics card) that employs lighting and power cross protection required by the telephone companies for Ethernet connectivity to the telephone network (e.g., for connection between a user's building and a telephone company building over existing outdoor telephone cables).
1. An Ethernet extension device for extending Ethernet over twisted pair comprising:
an Ethernet port for providing an Ethernet interface for receiving Ethernet signals from and transmitting Ethernet signals to an Ethernet cable connected thereto;
a twisted pair port for providing an interface to tip and ring outside-plant conductors of a telephone network for receiving telephone network signals from and transmitting telephone network signals to a single twisted pair of the telephone network;
a twisted pair transceiver for receiving telephone network signals from the twisted pair port;
an Ethernet transceiver for receiving Ethernet signals from the Ethernet port, each of the twisted pair transceiver and the Ethernet transceiver being provided with communication interface for communicating with each other having a compatible signal converting device for processing, respectively, the telephone network signals and the Ethernet signals into a compatible signal format used by both of the twisted pair transceiver and the Ethernet transceiver and for transmitting their respective processed signals to the Ethernet port and the twisted pair port; and
telephone network protection circuitry connected to the twisted pair port for providing protection against lightning surges and alternating current power faults required by the telephone network.
2. Ethernet extension device as claimed in claim 1 , wherein the compatible signal format is High-level Data Link Control.
3. Ethernet extension device as claimed in claim 1 , wherein the twisted pair transceiver is configured to provide a digital subscriber loop (DSL) interface to the telephone network via the twisted pair.
4. An Ethernet extension device as claimed in claim 3 , wherein the DSL interface is Symmetric High bit-rate DSL (SHDSL).
5. An Ethernet extension device as claimed in claim 1 , wherein the Ethernet port, the twisted pair port, the twisted pair transceiver, the Ethernet transceiver and the telephone network protection circuitry are provided on a single plug-in card dimensioned for deployment in a single card slot in a shelf of a telecommunications equipment bay.
6. An Ethernet extension device as claimed in claim 5 , wherein the single plug-in card dimensions do not exceed an overall height of about 5.6 inches, and overall width of about 1.4 inches, and an overall depth of about 6 inches.
7. An Ethernet extension device as claimed in claim 5 , wherein the single plug-in card is configured in one of a standard Type 400™ and Type 200™ mechanics circuit board arrangement.
8. An Ethernet extension device as claimed in claim 1 , wherein the Ethernet port, the twisted pair port, the twisted pair transceiver, the Ethernet transceiver and the telephone network protection circuitry are provided in a standard electrical wall box.
9. An Ethernet extension device as claimed in claim 8 , wherein the wall box is provided with a faceplate having at least one of a vent and heat sink.
10. An Ethernet extension device as claimed in claim 8 , wherein the wall box is provided with a face plate comprising a power input and one of an Ethernet connector for connection to the Ethernet port and the Ethernet port.
11. An Ethernet extension device as claimed in claim 1 , wherein the telephone network protection circuitry comprises at least one sidactor device connected across Tip and Ring connectors corresponding to the twisted port selected to crossbar from a high impedance state into a low impedance state when an overvoltage condition occurs between at least one of Tip and Ring and ground to shunt surge current to ground, and to transition to the high impedance state when the shunted current is below a selected threshold.
12. An Ethernet extension device as claimed in claim 1 , further comprising a transformer and an analog front-end circuit connected between the twisted pair port and the twisted pair transceiver, and wherein the telephone network protection circuitry comprises a low-capacitance steering diode/transient voltage suppressor (TVS) array combination connected across the analog front-end circuit to shunt surges in excess of a selected level on a power supply rail to the analog front-end circuit to the supply rail and to shunt surges below the ground reference for the supply rail to ground.
13. An Ethernet extension device as claimed in claim 1 , wherein the telephone network protection circuitry comprises first and second fuses provided at respective ones of the Tip and Ring connectors of the twisted pair port, the first and second fuses being selected to meet lightning surge and power fault requirements of the telephone network for outside telephone network circuits by opening and protecting telephone network wiring external to the Ethernet extension device when current shunted to frame ground are of a selected magnitude.
14. An Ethernet extension device as claimed in claim 1 , wherein the Ethernet port is 4-wire RJ45 connector having a transmit side and a receive side, and wherein the telephone network protection circuitry comprises first and second steering diode/transient voltage suppressor (TVS) array combinations connected respectively to the transmit side and the receive side and configured to provide overvoltage protection in the event of lightning surges and lightning surge tests and to meet AC power fault requirements of the telephone network by clamping differential voltage between corresponding ones of the four wires when an overvoltage condition occurs that exceeds a TVS breakdown voltage and shunting the resulting surge current through the corresponding one of the steering diode/TVS array combinations.
15. Ethernet extension device as claimed in claim 14 , wherein the telephone network protection circuitry further comprises first, second, third and fourth fuses provided at respective ones of the four wires of the RJ45 connector and selected to open and protect wiring external to the Ethernet extension device when current shunted by the first and second steering diode/transient voltage suppressor (TVS) array combinations is of a selected magnitude.
16. Ethernet extension device as claimed in claim 14 , further comprising an Ethernet physical interface circuit connected between the Ethernet port and the Ethernet transceiver, and wherein the telephone network protection circuitry further comprises third and fourth steering diode/transient voltage suppressor (TVS) array combinations connected respectively to the transmit side and the receive side and referenced to power supply rail for the Ethernet physical interface circuit, the third and fourth steering diode/TVS array combinations being configured to shunt surges in excess of a selected level on the power supply rail to the power supply rail and to shunt surges below the ground reference for the supply rail to ground by the corresponding one of the third and fourth steering diode/TVS array combinations.