IP113MLF-DS-R05 datasheet(19/58 Pages) ETC2

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IP113M LF

Preliminary Data Sheet

2.4

Loop back test

IP113M LF supports two kind of loop back test function, in-band loop back test and out-band loop back

test.

2.4.1

Out-band loop back test

Users can instruct central IP113M LF to issue a maintenance frame onto the fiber port by programming

MII register 24 to request a loop back test. Central IP113M LF does not generate test frames and users

need an external packet source from PC.

1. Disconnect switch port and instruct the terminal IP 113M LF to perform loop back and disable

terminal 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)

Maintenance frame

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

(1)

(2)

MDC, MDIO

(MII reg 24)

Switch

IP 113 M LF

( ter m ina l)

IP 113 M LF

( c en t r al)

( M I I r e g 0. 1 4= 1)

Sw itc h

2. T er m ina l I P 113 M LF r un s a t lo op bac k m od e

IP113M LF

(terminal)

IP113M LF

(central)

(MII reg 0.14=1)

3. PC forces test frames to central IP113M LF and terminal IP113M LF loops back the frames.

test frame

IP113M LF

(terminal)

IP113M LF

(central)

(MII reg 0.14=1)

4. PC reports the loop back test result after sending all test frames .

April 9, 2007

19/58

IP113M LF-DS-R11

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