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IP178C/IP178C LF/IP178CH/IP178CH LF
Datasheet
48/93
June 21, 2007
Copyright © 2004, IC Plus Corp.
IP178Cx-DS-R12
2.13
SCA
IP178C/IP178CH 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_LE
D
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 50m open
Off
On
Off
An
open
cable
with
length
between 50m and 100m
On
Off
Off
An
open
cable
with
length
between 100m and 150m
On
On
Off
An shorted cable with length
shorter than 50m
Off
Flash
Off
An shorted cable with length
between 50m and 100m
Flash
Off
Off
An shorted cable with length
between 100m and 150m
Flash
Flash
Off
Cable is normal
Off
Off
Off
2.14
Bandwidth control
IP178C/IP178CH 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/IP178CH 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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