CTI 2572-A Installation and Operation Guide V1.3
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CHAPTER 3. MODULE OPERATION
3.1. Front Panel Features
LED Indicators
The 2572-A provides an array of LEDs that inform the user of the module status and communications
activity. The functions of the LEDs are described below. See APPENDIX A. 2572-A LED
INDICATORS for more information.
MS
Module Status
. Indicates the status of the module hardware and
firmware. Steady Green indicates that the module hardware and
software is operational. Flashing green indicates that the module is
starting up. Steady red or flashing red indicates error conditions.
NS
Network Status
. Indicates the status of the network interface. Steady
Green indicates that the network server is operational (IP address
has been set). Steady red or flashing red indicates error conditions.
Off indicates that the network server has not been started.
LS
Link
Status
. Indicates the status of the Ethernet data link. Steady
Green indicates that a link has been established between the module
and the Ethernet hub or switch.
COL
Collision.
Lights when a collision is detected. Some collisions are normal when
sharing an Ethernet segment with other stations. Excessive collision activity
typically indicates an overloaded network or faulty cabling.
FDX
Full-Duplex.
Indicates the duplex mode in effect. When full duplex mode is used the
LED is Steady Green. Both the module and the switch can transmit concurrently.
There are no collisions in full duplex mode; both nodes have a separate transmission
path. The mode is automatically negotiated between the module and the attached
Ethernet switch. Full duplex can be used only with Ethernet switch configurations
that have one station per segment.
100
100 Mb.
Indicates the speed at which the network interface is operating. When the
LED is Steady Green the interface is operating at 100Mb. Otherwise the Ethernet
speed is 10Mb. The speed is automatically negotiated between the module and
attached Ethernet hub or switch.
XMT
Transmit
. There is one LED each for the serial port and the Ethernet port, which
illuminates when data is transmitted.
RCV
Receive.
There is one LED each for the serial port and the Ethernet port, which
illuminates when a signal is received. The Ethernet LED will flash when any network
traffic is detected, not just packets addressed to the module.
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