Avaya S8300 - Manual (Page 373)

Installation and wiring of telephones and power supplies
Issue 9.1 June 2006 373
Avaya Power over Ethernet (PoE) switches
Available PoE Switch Options
Data and power are combined in a (PoE) switch and sent over a single cable, thus simplifying
power management and cabling infrastructure and saving rack space.
Avaya offers the following PoE switches:
● C360 Converged Stackable Switches (C363T-PWR and C364T-PWR)
● C460 Converged Multilayer Switch
● P333T-PWR PoE Switch
All PoE Switches comply with the IEEE 802.3af standard.
PoE is carried over the signal leads, providing remote -48V power feeds on all 10/100 ports in
the switch/module (except on an expansion module in P333T-PWR). This allows the PD
(Powered Device) to be up to 100m away from the switch. Each port performs a standard
compatibility detection process before power is supplied to the Ethernet lines. If the PD is
removed or the link is interrupted, the port polling mechanism detects this, and power is cut off
to the port while the detection process is applied again.
The PoE switch applies power to the port only after it detects that a PD is actually connected to
the port. Each PD has a resistance range known as a "signature." The switch knows what
power has to be supplied to the device according to the signature.
Load detection is performed every 240 ms. All ports are checked for the resistance signature on
a port-by-port basis. Only non-powered ports participate in the periodic load detection. Once
power is provided to a port, it is checked periodically to see if a PD is still connected. If a PD is
disconnected from a powered port, then power is denied to the port. Disconnected ports then
automatically join the periodic load detection cycle. Each port of the switch is protected against
channel overload, short circuit, and reversed polarity that might be caused by faulty connection
between two feeding channels or by a crossed cable connection.
Switch Maximum PoE Power (W) Number of Powered Ports in Switch
C363T-PWR 305 24
C364T-PWR 520 48
C460 2,400 (with three PSUs) 192
P333T-PWR 200 24