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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)
TP
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)
TP
Switch
FX
IP 113 M LF
( ter m ina l)
IP 113 M LF
( c en t r al)
TP
TP
( 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
FX
IP113M LF
(terminal)
IP113M LF
(central)
TP
TP
(MII reg 0.14=1)
3. PC forces test frames to central IP113M LF and terminal IP113M LF loops back the frames.
FX
test frame
test frame
PC
IP113M LF
(terminal)
IP113M LF
(central)
TP
TP
(MII reg 0.14=1)
FX
PC
4. PC reports the loop back test result after sending all test frames .
April 9, 2007
19/58
Copyright © 2004, IC Plus Corp.
IP113M LF-DS-R11
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