ICS1892 datasheet(15/148 Pages) ICST

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Chapter 4

Overview of the ICS1892

ICS1892, Rev. D, 2/26/01

February 26, 2001

ICS1892

Chapter 4

Overview of the ICS1892

The ICS1892 is a stream processor. During data transmission, it accepts sequential nibbles from its MAC

(Media Access Control)/Repeater Interface, converts them into a serial bit stream, encodes them, and

transmits them over the medium through an external isolation transformer. When receiving data, the

ICS1892 converts and decodes a serial bit stream (acquired from an isolation transformer that interfaces

with the medium) into sequential nibbles. It subsequently presents these nibbles to its MAC/Repeater

Interface.

The ICS1892 implements the OSI model’s physical layer, consisting of the following, as defined by the

ISO/IEC 8802-3 standard:

• Physical Coding sublayer (PCS)

• Physical Medium Attachment sublayer (PMA)

• Physical Medium Dependent sublayer (PMD)

• Auto-Negotiation sublayer

The ICS1892 is transparent to the next layer of the OSI model, the link layer. The link layer has two

sublayers: the Logical Link Control sublayer and the MAC sublayer. The ICS1892 can interface directly to

a MAC and offers multiple, configurable modes of operation. Alternately, this configurable interface can be

connected to a repeater, which extends the physical layer of the OSI model.

The ICS1892 transmits framed packets acquired from its MAC/Repeater Interface and receives

encapsulated packets from another PHY, which it translates and presents to its MAC/Repeater Interface.

Note:

As per the ISO/IEC standard, the ICS1892 does not affect, nor is it affected by, the underlying

structure of the MAC/repeater frame it is conveying.

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