Dec 22
A link to an interesting article about the use of 802.11af (i.e. PROPER power over ethernet) and 802.11n access points.This is well worth a read if you are considering the purchase of any pre-802.11n equipment!
Everything You Need To Know About The Cisco 7960G
- Verizon's phone rings off the hook with IPv6 questionsInterest in IPv6 is exploding among U.S. CIOs, as news of the rapid depletion of IP addresses using the current standard – known as IPv4 – reaches corporate IT departments
- Cisco, Verizon power massive IP net at new Meadowlands stadium When the New York Giants inaugurate the New Meadowlands stadium with their first regular-season game in less than two weeks, fans will have the benefit of using a massive IP network that will be responsible for HD video displays, processing credit card transactions and delivering Wi-Fi connectivity to fans' wireless devices.
- Only 5 (all women) of 135 pass Defcon social engineering test Organizers of a recent Defcon social engineering contest will release their results next week. One conclusion is that women did well in protecting corporate secrets.
Dec 16
A. These Cisco IP phones support IEEE 802.3af PoE:
* 7961G-GE
* 7971G-GE
* 7931G
* 7941G-GE
* 7945G
* 7965G
* 7975G
Note: These Cisco IP phones support both the Cisco pre-standard PoE and IEEE 802.3af PoE:
* 7970G
* 7961G
* 7906G
* 7941G
* 7911G
* 7962G
Dec 16
Dec 16
Join the forum discussion on this post - (1) PostsA. They are the same. When Cisco Systems® first introduced powered Ethernet ports, the technology was called inline power. In order to allow for universal terminology, Cisco now uses “Power over Ethernet” or “PoE” for all deployments, standard or pre-standard.
What is the difference between the Cisco original PoE products and the IEEE 802.3af standard?
A. The differences include:
* the amount of power that is available to the connected device
* the method used for device discovery
* the way that power is removed from the wire when a powered device is removed
Dec 16
Join the forum discussion on this post - (1) PostsA. Power over Ethernet (PoE) is the ability to deliver 48 VDC of power over the same copper cable as Ethernet. Two primary elements are required in order to implement PoE. They are:
* power sourcing equipment (PSE)—the LAN switch or source power delivered over Ethernet
* the powered device (PD)—the end device that accepts and uses power from the Ethernet cable for its operation
Dec 16
Power over Ethernet (PoE) is the ability for the LAN switching infrastructure to provide power over a copper Ethernet cable to an endpoint or powered device.
This capability was developed and first delivered by Cisco in 2000 in order to support the emerging IP Telephony deployments. IP telephones, such as desktop PBX phones, need power for their operation, and PoE enables scalable and manageable power delivery and simplifies deployments of IP Telephony.
While IP telephones and wireless access points (APs) are the most intuitive uses for PoE, the advent of the 802.3af standardization of PoE opens the door to a new generation of network-attached devices, such as video cameras, point-of-sale devices, security access control devices (card scanners), building automation and industrial automation.
PoE promises to create a new world of networked appliances as it provides power and data connectivity over existing Ethernet cables.