Step Technica MKY02, User Manual

Page: 57 / 73

Chapter 4 Cascade Connection of MKY02
4 - 9
4.2.7 Placement of Monitor LEDs
The MKY02 has the function to connect various monitor LEDs (refer to “3.4 Connecting Monitor
LEDs” ). In the port-added HUB by cascade-connecting multiple MKY02s, depending on the placement of
monitor LEDs, the level of convenience increases in user system installation, network cable setup, and vari-
ous maintenance works (refer to Fig. 4.9).
StepTechnica recommends monitor LEDs be placed as follows.
(1) Place the port receive monitor LED beside each port connector (Fig. 4.9). For details of the port
receive monitor, refer to “3.4.3 Port Receive Monitor” .
(2) Place the packet error monitor LED as a representative of the port which one MKY02 serves by the
number of MKY02 to be used (Fig. 4.9). For details of the packet error monitor, refer to “3.4.2
Packet Error Monitor” .
The user who designs a HUB needs to determine the placement of monitor LEDs.
The packet receive monitor described in
“3.4.1 Packet Receive Monitor”
and the packet
error monitor described in “3.4.2 Packet Error Monitor” function only when they receive
packets from the input pins (RXD0 to RXD7) of each port. These monitors do not function
for packets passing through the priority cascade connection signals and reverse-priority
cascade connection signals described in
“4.2.2 Operation of Cascade Connection
Pins” . Therefore, in the port-added HUB by cascade-connecting the MKY02, place the
packet receive monitor and packet error monitor by the number of MKY02 to be used.