VSC8211XVW Vitesse Semiconductor Corp, VSC8211XVW Datasheet - Page 62

• Manufacturer Part Number: VSC8211XVW
• Description: IC PHY 10/100/1000 SGL 117-LBGA
• Manufacturer: Vitesse Semiconductor Corp
• Type: PHY Transceiverr

Specifications of VSC8211XVW

• Number Of Drivers/receivers: 1/1
• Protocol: Gigabit Ethernet
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 117-LBGA
• Case: BGA
• Dc: 07+
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 907-1023

17 Ethernet In-line Powered Device Support
17.1 Cisco In-Line Powered Device Detection
This feature is used for detecting in-line powered devices in Ethernet network applications. The VSC8211's in-line powered
device detection mode can be part of a system that allows for IP-phone and other devices to receive power from an Ethernet
cable, similar to office digital phones receiving power from a PBX (Private Branch Exchange) office switch via the phone cable.
This can eliminate the need for an IP-Phone to have an external power supply, since the Ethernet cable provides power. It also
enables the in-line powered device to remain active during a power outage (assuming the Ethernet switch is connected to an
uninterrupted power supply, battery, back-up power generator, etc.). This mode is disabled by default and must be enabled in
order to perform in-line powered device detection. Please refer to additional information at
products/hw/phones/ps379/products_tech_note09186a00801189b5.shtml
17.2 In-Line Power Ethernet Switch Diagram
17.3 In-Line Powered Device Detection (Cisco Method)
This section describes the flow process an Ethernet switch must perform in order to process in-line power requests made by a
link partner (LP) capable of receiving in-line power.
VMDS-10105 Revision 4.1
October 2006
1.
2.
The in-line powered device detection mode is enabled by setting MII Register bit 23E.10 = 1 and ensuring that the
Auto-Negotiation Enable Bit is set (MII Register 0.12 = 1). An interrupt can also be asserted on the MDINT pin when
in-line power is needed. This is set by MII Register 25.9 = 1 and ensuring MII Register 25.15 = 1 in order to enable
the MDINT pin.
The PHY will then start sending a special Fast Link Pulse (FLP) signal to the LP. MII Register 23E.9:8 will equal 00
during the search for devices needing in-line power.
Interface
CAT-5
M AC
10/100/1000BASE-T
Gigabit Switch/M AC
Figure 30. In-line Powered Ethernet Switch Diagram
VSC8211
PHY
X-form er
R J-45
I/F
SM I
62 of 165
Processor
for additional information.
SUPPLY
PO W ER
IN-LINE
UNIT
Control
http://www.cisco.com/en/US/
Datasheet
VSC8211