Administration of the Avaya G350 Media Gateway - Avaya Support
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Administration of the Avaya G350 Media Gateway - Avaya Support

Administration of the Avaya G350 Media Gateway - Avaya Support Administration of the Avaya G350 Media Gateway - Avaya Support

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Configuring PoELoad detectionThe MM314 PoE media module periodically checks all ports, powered and non-powered, tocheck their status and the power status of connected devices. The module supplies power to aport only after it has detected that a suitable Powered Device (PD) is connected to the port. TheMM314 PoE media module looks for an IEEE 802.3af-compliant signature from the device thatindicates that the device requires power.How the G350 detects a powered deviceThe following figure shows the process of applying PoE power to a PD.Figure 8: Powered Device DetectionStart CheckValid ResistanceSignature?YesNoSufficient power?YesNoApply PowerYesNoPD stillconnected?The MM314 PoE media module applies a low voltage to the power feed pairs and measures thecurrent. A resistance of 19kΩ to 26.5kΩ is considered valid. If a valid signature is detected, andthe MM314 has not exceeded its PoE allocated power, then power is supplied to the port.Once power is provided to a port, it is checked periodically to see if a PD is still connected. If aPD is disconnected from a powered port, then power is denied to the port.112 Administration of the Avaya G350 Media Gateway

PoE overviewPlug and Play OperationYou can add and remove powered devices without manually reconfiguring the switch, since itperforms a periodic automatic load detection scan on non-powered ports.●●If a powered device that fits the above criteria is detected on a non-powered port, thenpower is applied to the port.If a powered device is removed from a port, then power is denied to that port. Thedisconnected port is then scanned as well.In addition, if the PoE module is removed and replaced with module of the same type, the portpower configuration of the module is retained.Powering devicesThe Avaya G350 MM314 PoE media module has its own power supply. Therefore, a full 210 Wof power is available for PDs. Each port can supply up to 19.5 W by default. If a powered devicetries to draw more than the maximum allowed power per port, power is denied.Since 210 W may not be enough for driving powered devices on all the ports simultaneously, apriority mechanism exists.The priority mechanism determines the order in which ports are powered after the switch isbooted.There are three user-configurable PoE priority levels:●●●LowHighCriticalThe default value for all ports is Low.Power is automatically applied to PDs according to their priority when the power budgetincreases. If the power budget is exceeded, power is not provided to a new PD when you attachit, even if you define its priority as High or Critical.Note:Note:The order in which ports are powered within the same priority group is notsequential.Issue 3 January 2005 113

Configuring PoELoad detectionThe MM314 PoE media module periodically checks all ports, powered and non-powered, tocheck <strong>the</strong>ir status and <strong>the</strong> power status <strong>of</strong> connected devices. The module supplies power to aport only after it has detected that a suitable Powered Device (PD) is connected to <strong>the</strong> port. TheMM314 PoE media module looks for an IEEE 802.3af-compliant signature from <strong>the</strong> device thatindicates that <strong>the</strong> device requires power.How <strong>the</strong> <strong>G350</strong> detects a powered deviceThe following figure shows <strong>the</strong> process <strong>of</strong> applying PoE power to a PD.Figure 8: Powered Device DetectionStart CheckValid ResistanceSignature?YesNoSufficient power?YesNoApply PowerYesNoPD stillconnected?The MM314 PoE media module applies a low voltage to <strong>the</strong> power feed pairs and measures <strong>the</strong>current. A resistance <strong>of</strong> 19kΩ to 26.5kΩ is considered valid. If a valid signature is detected, and<strong>the</strong> MM314 has not exceeded its PoE allocated power, <strong>the</strong>n power is supplied to <strong>the</strong> port.Once power is provided to a port, it is checked periodically to see if a PD is still connected. If aPD is disconnected from a powered port, <strong>the</strong>n power is denied to <strong>the</strong> port.112 <strong>Administration</strong> <strong>of</strong> <strong>the</strong> <strong>Avaya</strong> <strong>G350</strong> <strong>Media</strong> <strong>Gateway</strong>

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