IP113A LF
Preliminary Data Sheet
9/22
April 9, 2007
Copyright © 2004, IC Plus Corp.
IP113A LF-DS-R08
1.
PIN Description (continued)
Pin no.
Label
Type
Description
MC operation mode
21
LFP
IPL
Link fault pass through (LFP)
1: enable
Link status of one port is forwarded to the other port.
0: disable (default)
22,
23
DIRECT_WIRE,
FAST_FWD
IPL
DIRECT_
WIRE
FAST_FWD
Function
0
0
Store and forward switch mode
(default)
0
1
Modified cut-through switch
mode
1
0
Converter mode
1
1
Converter mode with
auto-change-forward function
Store and forward switch mode:
IP113A LF will begin to transmit a frame right after the
completion of receiving a frame.
Modified cut-through switch mode:
IP113A LF will begin to forward a frame after the first 64
bytes data received. TP port should be forced at 100M at
this mode.
Converter mode:
Incoming frames are not buffered in IP113A LF to achieve
the min latency. Both TP port and fiber port of IP113A LF
should work at 100M full duplex in this mode. If TP port is
linked at half duplex, the total length of UTP cable and fiber
should be less than 60 meters to meet the requirement of
CSMACD in IEEE802.3.
Converter mode with auto-change-forward function:
IP113A LF will change to forward mode if it detects the
speed is different in TP port and FX port.
In converter mode, IP113A LF forwards IEEE802.3x pause
frame directly. In the other modes, IP113A LF doesn’t
forward IEEE802.3x pause frame directly, it sends out
pause frame when its internal buffer is full.
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