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IP178C
Preliminary Data Sheet
46/91
October 27, 2005
Copyright © 2004, IC Plus Corp.
IP178C-DS-R09
2.13
SCA
IP178C performs SCA on each port and shows the test result on LED pins whenever pin SCA is pulled
high. The LED display is independent of LED_SEL pins. The following table shows the LED behavior of a
port performing SCA.
LinK_LED
SPEED_LED
FDX_LED
Scan port by port
Scan port by port
Scan port by port
SCA initiation
(under testing)
Running Horse LED:
On 286ms -> Off 2s -> On 286ms -> Off 2s
Test fail
On-Off-On-Off
On-Off-On-Off
Off
An open cable with length
shorter than 40m open
On
Off
Off
An open cable with length
between 40m and 80m
Off
On
Off
An open cable with length
between 80m and 120m
On
On
Off
An
shorted
cable
with
length shorter than 40m
Flash
Off
Off
An
shorted
cable
with
length between 40m and
80m
Off
Flash
Off
An
shorted
cable
with
length between 80-120m
Flash
Flash
Off
Cable is normal
Off
Off
Off
2.14
Bandwidth control
IP178C provides the bandwidth control mechanism to manage or control the data rate on a limited
bandwidth network. By controlling the ingress data rate and the egress data rate, it provides a bandwidth
management solution for local area networks and also provides quick and easy allocation of uplink or
downlink speeds to meet and guarantee a wide range of customer bandwidth requirements.
IP178C provides the easiest way to allocate bandwidth for each port, which defined in MII registers 31.26
~ 31.29 or EEPROM registers 116 ~ 123. The ingress/egress data rate control range is from 128 kbps to
8 Mbps for each port.
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