Black Box ASTCKEY - Manual (Page 27)

Chapter 2: Installation
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Options
Full Power Reserve (FPR):
Optional, 9.6V, 700mAh NiCad rechargeable
battery. When fully charged, it will maintain normal
operations for 6 hours or 400 prints.
Power over Ethernet (PoE): Optional, and includes 9.6V, 700mAh NiCad
rechargeable battery.
48V in, 13.5V out
2.12. Power over Ethernet Overview
With the PoE Option for Auto-Sync Time Clock:
Power-over-Ethernet (PoE) is a network standard based on IEEE 802.3af that
provides a means of delivering power to devices connected to a LAN. This
technology eliminates AC electrical wiring, wall transformers, allows centralized UPS
backup, and is compatible with both powered and non-powered Ethernet devices.
In addition to providing time synchronization and control over Ethernet, a PoE
enabled Ethernet cable can provide power to the Auto-Sync Time Clock. This allows
greater flexibility for placing clocks and, in most cases, significantly decreases
installation costs. The Auto-Sync Time Clocks utilize the spare wires from the Cat 5
Ethernet cable to provide power over Ethernet. The Auto-Sync Time Clocks will
work with older non-standard and passive power sources, and newer auto-sensing
PoE switches and mid-span power injectors. Power-over-Ethernet begins with an
Ethernet power source such as a PoE compatible switch or a mid-span power
"injector". These devices insert power onto the Ethernet cable. The power source is
typically installed in the "wiring closet" near the Ethernet switch or hub.
The Auto-Sync Time Clocks may be ordered as PoE compatible, or converted at a
later time by adding the PoE option kit. PoE is able to supply a maximum of about
15 watts of power over the Ethernet cable.