RTL8196C View Datasheet(PDF) - Realtek Semiconductor

Part Name

Description

Manufacturer

RTL8196C

IEEE 802.11n AP/ROUTER NETWORK PROCESSOR WITH EEE

Realtek Semiconductor 

RTL8196C

Datasheet

8. Green Ethernet

8.1. Cable Length Power Saving

The RTL8196C provides link-on and dynamic detection of cable length, and dynamic adjustment of

power required for the detected cable length. This feature provides high performance with minimum

power consumption.

8.2. Link Down Power Saving

The RTL8196C implements link-down power saving on a per-port basis, greatly cutting power

consumption when the network cable is disconnected. A port automatically enters link down power

saving mode ten seconds after the cable is disconnected from it. Once a port enters link down power

saving mode, it transmits normal link pulses on its TXOP/TXON pins and continues to monitor the

RXIP/RXIN pins to detect incoming signals, which might be 100Base-TX MLT-3 idle pattern, 10Base-T

k link pulses, or Auto-Negotiation’s FLP (Fast Link Pulse). After it detects an incoming signal, it wakes up

from link down power saving mode and operates in normal mode according to the result of the connection.

lte L 8.3. Energy Efficient Ethernet (EEE)

a IA The RTL8196C supports IEEE 802.3az Draft 2.0, also known as Energy Efficient Ethernet (EEE) in

100Base-TX in full duplex operation, and 10Base-T in full/half duplex mode. This standard is being

T developed by the IEEE 802.3az Task Force, and should be finalized by September 2010. It provides a

e N N protocol to coordinate transitions to/from a lower power consumption level (Low Power Idle mode) based

R E IO on link utilization. When no packets are being transmitted, the system goes to Low Power Idle mode to

T save power. Once packets need to be transmitted, the system returns to normal mode, and does this

ID A without changing the link status and without dropping/corrupting frames.

R To save power, when the system is in Low Power Idle mode, most of the circuits are disabled, however,

NF PO the transition time to/from Low Power Idle mode is kept small enough to be transparent to upper layer

R protocols and applications.

O O EEE also specifies a negotiation method to enable link partners to determine whether EEE is supported

C C and to select the best set of parameters common to both devices.

E • For 100Base-TX PHY: Supports Energy Efficient Ethernet with the optional function of Low Power

T Idle.

for Z • For 10Base-T, EEE defines a 10Mbps PHY (10Base-Te) with reduced transmit amplitude

requirements. 10Base-Te is fully interoperable with 10Base-T PHYs over 100m of class-D (Cat-5)

cable.

Refer to http://ieee802.org/3/interims/index.html for more details.

IEEE 802.11n AP/Router Network Processor with EEE 24

Track ID: JATR-2265-11 Rev. 0.7

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