DP83251 datasheet(12/96 Pages) NSC

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30 Functional Description (Continued)

STATION CONFIGURATIONS

Single Attach Station (SAS)

The Single Attach Station can be connected to either the

Primary or Secondary ring via a Concentrator Only 1 MAC

is needed in a SAS

Both the DP83251 and DP83255 can be used in a Single

Attach Station The DP83251 can be connected to the MAC

via its only PHY Port Interface The DP83255 can be con-

nected to the MAC via either of the 2 PHY Port Interfaces

See

Figures 3-6 and 3-7

Dual Attach Station (DAS)

A Dual Attach Station can be connected directly to the dual

ring There are two types of Dual Attach Stations DAS with

a Single MAC and DAS with Dual MACs See

Figures 3-8

and

3-9

Although two DP83251s can be connected together to build

a Dual Attach Station it is recommended that the DP83255

is to be used for this type of station configuration

A DAS with Single MAC can be configured as follows

B Indicate data of PHY A is connected to A Request

input of PHY

B B

Request input of PHY

A is con-

nected to A

Indicate output of PHY

The MAC can be connected to either the A Request

input and the A

Indicate output of PHY

Aorthe

Request

input

and

the

Indicate

output

of PHY

The DAS with Dual MACs can be configured as follows

B Indicate data of PHY A is connected to A Request

input of PHY

B B

Request input of PHY

A is con-

nected to A

Indicate output of PHY

The MAC 1 is connected to the B Indicate output and

the B

Request Input of PHY

The MAC 2 is connected to the A Indicate output and

the A

Request Input of PHY

TLF10386 – 8

FIGURE 3-6 Single Attach Station Using the DP83251

TLF10386 – 9

FIGURE 3-7 Single Attachment Station (SAS)

Using the DP83255

TLF10386 – 10

FIGURE 3-8 Dual Attachment Station (DAS) Single MAC

TLF10386 – 11

FIGURE 3-9 Dual Attachment Station (DAS) Dual MACs

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