Cisco Technology, Inc.

James Molenda

Roger Antoine Karam

Karl S Nakamura

Maurilio Tazio De Nicolo

John K Restrick, Jr

Mohamed Kamel Zanaty

Paul Norwood Booth

Vipul Jain

In one implementation, a classification resistance of a powered device is adjusted passively. The powered device is configured to receive a classification voltage from a network device and, in response, is configured to send a first current indicative of a first classification resistor to the network device. The first current and first classification resistor indicate a power requirement when no accessories are connected to the powered device. When at least one accessory is connected to the powered device, the powered device is configured to send a second current indicative of a second classification resistor to the network device. The second classification resistor is isolated from other circuitry of the at least one accessory. The second classification resistor may be located in the powered device, the accessory, or a connector coupled to the powered device and the accessory.

Automatic classification change in power over ethernet device

In an example embodiment, an IP phone is connected to a network switch that has an established communications channel to a call control server. The network switch acts as a proxy for the phone exchanging registration information that in effect keeps the phone registered while the phone itself can go to sleep as defined by periods of the day, periods where the phone is unused, or presence, which can then wake-up quickly with assistance from the switch. If the switch is not able to act as proxy, the phone can switch from sleep mode to 'wake' up mode at predetermined intervals, such as every 30 seconds, in order to respond to keep alive packets from the call control server.

Network switch employing a proxy to facilitate power savings in a telephone network

A method and apparatus provide an IP telephone or similar device with a mechanism to receive and at least briefly loop back discovery signals received from a telecommunications device such as an Ethernet switch while not permitting the loop back of data packet signals. No mechanical relays are required and the circuitry can be fully integrated on an integrated circuit using commonly available techniques, if desired.

Unpowered twisted pair loopback circuit for differential mode signaling

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Los Gatos, CA, United States of America

James Molenda