IP113MLF-DS-R05 datasheet(21/58 Pages) ETC2

21 / 58 page

IP113M LF

Preliminary Data Sheet

Loop back test (continued)

2.4.2

In-band loop back test

Besides performing the loop back test with an external packet source, IP113M LF supports an easy

alternative. IP113M LF sends out private maintenance frame to do loop back test. All users have to do is

to program MII registers through SMI.

1. Disabe receive function of central TP port and instruct the terminal IP113M LF to perform loop

back and disable T2 timer by programming central IP113M LF through SMI

IP113M LF

(terminal)

IP113M LF

(central)

Maintenance frame

(C1=1, C2-3=10, C8-15=10000000)

MDC, MDIO

(MII reg 24)

Switch

IP113M LF

(terminal)

IP113M LF

(central)

(MII reg 0.14=1)

Switch

2. Terminal IP113M LF runs at loop back mode and acknowledges with maintenance frame

Maintenance frame

(C1=0, C2-3=11, C8-15=10000000)

IP113M LF

(terminal)

IP113M LF

(central)

(MII reg 0.14=1)

3. Central IP113M LF forces test frames to terminal IP113M LF and terminal IP113M LF loops

back the test frames. Central IP113M LF checks the received test frame.

test frame

Switch

MDC, MDIO

(MII reg 24,25)

IP113M LF

(term inal)

IP113M LF

(central)

Maintenance frame

(C1=1, C2-3=10, C8-15=00000000)

Maintenance fram e

(C1=0, C2-3=11, C8-15=00000000)

(1)

(2)

M DC, MDIO

(MII reg 24)

4. Central IP113M LF ends loop back test enables receive function of TP port and enable LP T 2

tim er

Switch

21/58

April 9, 2007

IP113M LF-DS-R11

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