- Manual...
-
Hardened VDSL Ethernet Extender
Installation and User guide (5/8/2013)
- Manual...
-
Hardened PoL PoE Ethernet Extender User Manual
User Manual for the LBPS310A-KIT, LBPS311A, & LBPS312A (Version 1)
- Quick Start Guide...
-
10BASE-T/100BASE-TX Hardened Ethernet Extender over vDSL
(Version 1)
- Manual...
-
Wireless Point-to-Point Ethernet Extender User Manual
User Manual for the LWE100A-KIT and LWE100AE-KIT (Version 1)
- Manual...
-
LinkGain 10/100BASE-TX to 100BASE-FX Media Converter Manual
Manual for the BMC300-MMST and LBMC300-MMSC (Version 1)
Non-standard PoE
Because Power over Ethernet (PoE) delivers power over the same cable as data, it’s popular for powering devices such as VoIP phones, wireless access points, and security cameras. It often... more/see it nowleads to significant savings by eliminating the need to install a separate power outlet.
Most PoE today is standards-based IEEE 802.3af or the newer higher-powered IEEE 802.3at PoE, which are very safe because power source equipment (PSE) doesn’t add power to the data line unless it detects a compatible powered device (PD) connected to the other end of the cable. This protects devices that do not support PoE. PSEs and PDs also negotiate power requirements, so a PD never receives too much power. Both PSEs and PDs have power supplies and regulators isolated from ground to minimize shock hazard.
But here’s where it gets complicated…
Because most PoE available today is standards-based 802.3af or 802.3at, it’s easy to forget that there are versions of PoE that are NOT standards based. Some of these non-standards-based versions of PoE feature power injectors that inject power without checking compatibility—and that can be very bad news for an innocent network device.
Non-standard PoE tends to fall into three categories: proprietary PoE, high-wattage proprietary PoE, and passive PoE.
Proprietary PoE.
Before the ratification of the 802.3af standard in 2003, PoE was a free-for-all with many vendors offering their own method of delivering power over data lines. Some vendors still offer their own proprietary PoE. These proprietary solutions offer varying degrees of communication between PSE and PD. Our Black Box® Wireless Point-to-Point Ethernet Extender Kit (LWE100A-KIT) uses Prorietary PoE in the form of 12 VDC running at 12 W, which is well below the 48 VDC and 15.4 W provided by standard 802.3af.
High-wattage Proprietary PoE.
Many vendors offer high-wattage PoE solutions designed to deliver from 50 watts to 100 or even 200 watts per port. High-wattage proprietary PoE is often used with high-powered outdoor wireless radios.
Passive PoE.
Passive PoE injects power into an Ethernet cable on Pins 4 and 5 with negative return on Pins 7 and 8 and absolutely no communication between PSE and PD. This method was once a very common “home brew” method of transferring power over data cable and is still commonly used in telecomm applications.
Document and label.
There’s nothing wrong with PoE that’s not standards based—these power methods work as well as 802.3af/at PoE to power network devices. You do, however, need to be aware of what kind of Power over Ethernet you have and what it will work with. Good network documentation and labeling are the keys that enable you to know that, for instance, that power injector is a high-wattage proprietary injector that will fry the IP camera you’re about to connect. Proper documentation, which is good practice in any case, becomes absolutely vital when you have components that may damage other components.
collapse
Non-standard PoE
Because Power over Ethernet (PoE) delivers power over the same cable as data, it’s popular for powering devices such as VoIP phones, wireless access points, and security cameras. It often leads to significant savings by eliminating the need to install a separate power outlet.
Most PoE today is standards-based IEEE 802.3af or the newer higher-powered IEEE 802.3at PoE, which are very safe because power source equipment (PSE) doesn’t add power to the data line unless it detects a compatible powered device (PD) connected to the other end of the cable. This protects devices that do not support PoE. PSEs and PDs also negotiate power requirements, so a PD never receives too much power. Both PSEs and PDs have power supplies and regulators isolated from ground to minimize shock hazard.
But here’s where it gets complicated…
Because most PoE available today is standards-based 802.3af or 802.3at, it’s easy to forget that there are versions of PoE that are NOT standards based. Some of these non-standards-based versions of PoE feature power injectors that inject power without checking compatibility—and that can be very bad news for an innocent network device.
Non-standard PoE tends to fall into three categories: proprietary PoE, high-wattage proprietary PoE, and passive PoE.
Proprietary PoE.
Before the ratification of the 802.3af standard in 2003, PoE was a free-for-all with many vendors offering their own method of delivering power over data lines. Some vendors still offer their own proprietary PoE. These proprietary solutions offer varying degrees of communication between PSE and PD. Our Black Box® Wireless Point-to-Point Ethernet Extender Kit (LWE100A-KIT) uses Prorietary PoE in the form of 12 VDC running at 12 W, which is well below the 48 VDC and 15.4 W provided by standard 802.3af.
High-wattage Proprietary PoE.
Many vendors offer high-wattage PoE solutions designed to deliver from 50 watts to 100 or even 200 watts per port. High-wattage proprietary PoE is often used with high-powered outdoor wireless radios.
Passive PoE.
Passive PoE injects power into an Ethernet cable on Pins 4 and 5 with negative return on Pins 7 and 8 and absolutely no communication between PSE and PD. This method was once a very common “home brew” method of transferring power over data cable and is still commonly used in telecomm applications.
Document and label.
There’s nothing wrong with PoE that’s not standards based—these power methods work as well as 802.3af/at PoE to power network devices. You do, however, need to be aware of what kind of Power over Ethernet you have and what it will work with. Good network documentation and labeling are the keys that enable you to know that, for instance, that power injector is a high-wattage proprietary injector that will fry the IP camera you’re about to connect. Proper documentation, which is good practice in any case, becomes absolutely vital when you have components that may damage other components.
- Manual...
-
LinkGain Ethernet Extender over Coax User Manual
User Manual for the LBNC300A and LBNC300AE (Version 2)
- Manual...
-
LongSpan Wireless Ethernet Extender (Long-Distance 900-MHz Directional 15-dBi Yagi Antenna) Manual
Manual for LS900-15Y (Version 1)
- Manual...
-
Gigabit PoE Repeater Usr Manual
User Manual for the LPR1101 & LPR1131 (Version 1)
- Manual...
-
T1/E1 Ethernet Network Extender Kit Manual
Manual for LR0304A-KIT, LR0308A-KIT (Version 2)