EvalAgSil Evaluation Kit User Manual

Introduction

This manual is intended to be a guide to using the "EvalAgSil Evaluation Board" with one of Silvertel's SIL (Single-In-Line) footprint PD (Powered Device) modules. The board is designed to handle 10/100/1000/10GBASE-T Ethernet data rates.

This board has been designed to assist with evaluating the use of Silvertel's SIL format modules in an application; as such it has been designed to pass through Ethernet data signals (10/100/1000/10GBASE-T) from the Midspan PSE (Power Sourcing Equipment) or PoE enabled switch connected to J100, onto the system connected to J101.

Board Layout

The EvalAgSil board is a green PCB featuring several connectors, components, and indicators. Key connectors include J100 (Data & Power) and J101 (Data) for input/output. Other connectors include J3, J4, and J5 for power output. Several LEDs (LED1, LED2, LED3) indicate status. The board accommodates various bridge rectifier modules and Silvertel SIL modules. The T100 Ethernet transformer is also prominently visible.

Link Settings

• LK2 – Output Adjust Select
• LK3 – AT-DET LED Enable
• LK4 – 'V' cap Enable
• LK5 – Input Power LED Enable
• LK6 – Output Power LED Enable

Compatible Models

Input

One of Silvertel's PD modules fitted to the EvalAgSil evaluation board will present a valid signature and classification request to an IEEE compliant PSE through its RJ45 connector J101.

Diode Bridge Selection

The EvalAgSil has the option to fit different bridge rectifier technologies. Supplied with the EvalAgSil are three bridge rectifier modules for evaluating the losses involved when using different rectifier technologies:

• Bridge Rectifier Module – featuring 2x DF01S bridge rectifiers
• Schottky Bridge Rectifier Module – featuring 8x SS36 Schottky rectifier diodes
• Ideal Bridge Rectifier Module - featuring 2x FDMQ8205A MOSFET bridge rectifiers

A simple method of utilising the most power output on a PoE system is to reduce the losses involved in the rectification. Rectification is required to enable the PD to be insensitive to the polarity of the power on the pairsets in a PoE system.

Schottky rectifiers are an improvement over conventional bridge rectifiers due to their lower forward voltage drop, a greater improvement can be made by switching to an active bridge rectifier topology.

The chosen bridge rectifier module should be inserted into the EvalAgSil board using the two 2-pin and one 10-pin headers on the left-hand side of the board before power is supplied to the board.

Input Signature

The EvalAgSil board will automatically direct the power from J101 through the bridge rectifier module to the input of the Silvertel module fitted into U1. This module will provide a 25K signature required to be powered from an IEEE compliant PSE. The EvalAgSil has been designed to be powered by any compliant IEEE802.3 PSE such as Silvertel's Ag6120 PSE module.

PSE Detect

When U1 on the EvalAgSil board has been populated with a module that contains an 'AT-DET' feature, and it has detected it is being powered by an IEEE802.3 type 2 or greater PSE, the 'at Flag' pin will be pulled low, and this will cause LED3 to become illuminated on the EvalAgSil board.

Output

The output voltage will be present on both the DC10 connector, J4 and the banana plug terminals J3 and J5. J3 and the centre pin of J4 are the positive outputs, with the outer ring of J4 and J5 being the negative output.

Output Adjust

By default, the nominal output voltage of the fitted module will be present on the output connectors. This can be adjusted up or down using the adjust connector, LK2.

The EvalAgSil is fitted with two adjust resistors. The down adjust resistor R3 is fitted with a 68kΩ resistor. And the up adjust resistor R4, which is fitted with a 0Ω resistor. Depending on the module fitted, the down adjust resistor R3 may have to be replaced with a different value in order to provide the full down adjust stated in the corresponding datasheet.

To increase the output voltage, insert a jumper to LK2 in the upper position, so that the link is between the middle and upper pin.

To reduce the output voltage, insert a jumper to LK2 in the lower position, so that the link is between the middle and lower pin.

If the output voltage needs to be set to a different value (within the adjustment range), then connect different value resistors in place of R3 (0Ω) or R4 (68KΩ) and connect the jumper into the corresponding link setting.

Note: Ensure that the down adjust resistor is not shorted when connecting a module that has a higher stated resistance in the datasheet, as this could cause damage to the module.

Data Output

Any data that is provided over the PI (Ethernet cable) connected to the Data & Power port, J100 will be transposed onto the Data output port, J101 via the data transformer. The data traces on the evaluation board have been designed to pass through 10/100/1000/10GBASE-T Ethernet data signals. No processing or amplification of this signal will be performed on the evaluation board.

Operation

To ensure that the PSE does not apply power to a non-PoE enabled device, the output port first checks for a valid PoE signature. If the PSE does not see a valid signature, then it will disconnect, wait approximately 2 seconds, then try again. Once a valid signature has been detected, the PSE will then perform classification to determine the power requirement of the PD; only after this has occurred will the PSE supply power to the powered device.

LED Output

There are three LEDs fitted to the EvalAgSil board; each of these can be disabled by removing the associated link jumper.

EMI

The EvalAgSil contains many of the recommended components for preliminary EMI testing of an application. 'V' capacitors, C2 & C3, can be enabled by inserting a jumper on to LK4. The board is fitted with ferrite beads, L1-6; if these are not required, they can be effectively removed from the circuit by fitting R1 and R2 with 0Ω resistors. With some of the newer Silvertel module designs, an additional EMI filtration method is to fit a 68nF capacitor to C4. Silvertel recommends that this capacitor is rated to 250V so that it retains more of the rated capacitance in the operating voltage range.

Test Setup

Figure 2 shows the basic set up using the EvalAgSil evaluation board powered by Silvertel's EvalAg6120 PSE.

Equipment Required:

• EvalAgSil fitted with compatible Silvertel PD Sil Module.
• EvalAg6120 or other IEEE802.3 compliant PSE.
• Power supply unit, +44-57V output e.g. 60V bench power supply.
• CAT5e or greater cables.
• Application Circuit.

Optional Equipment:

• Data source e.g. PC.

Test Setup Diagram Description: The diagram illustrates a typical test configuration. A Power Supply (57V - 3A) connects via a CAT5e Cable to the J100 port of the EvalAg6120 device. The EvalAg6120 is then connected via a CAT5e Patch Cable to the J101 (Data & Power) port of the EvalAgSil board. The EvalAgSil board's J100 port connects via another CAT5e Patch Cable to an Application device (e.g., IP Camera). The EvalAgSil also provides power output via J4 and J3.

Data Throughput

To pass data via the Evaluation boards, the data input (e.g. Internet) can be connected to J100 on the EvalAg6120 Board using a cat5e cable. The data is then passed through the data transformer, where power is added and sent out via connector J101 of the EvalAg6120 Board. The Data and power is extracted through J101 of the EvalAgSil board and then divided into its separate power and data through the data transformer. The data output is then available from J100 of the EvalAgSil Board, which can then be connected to the application device.

Additional Information

Full operating conditions and features of the Silvertel module set can be found in the relevant product datasheet, available from www.silvertel.com.

Schematic

The schematic diagram illustrates the detailed electronic circuitry of the EvalAgSil evaluation board. It shows the interconnections of components including the T100 Ethernet transformer, bridge rectifiers (BR1), power input/output connectors (J100, J101, J3, J4, J5), voltage regulators (U1), LEDs (LED1, LED2, LED3), and various resistors, capacitors, and inductors. The schematic provides a blueprint for the board's functionality and component placement.

Bill of Materials

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