User's Manual

PN 8100-40 Help Hot Line (U.S. only): 1-800-530-9960 3-3
620004-0 Rev. B
LGCell Main Hub Front Panel
3.1.1 MMF Downlink/Uplink Ports
The Main Hub’s MMF downlink/uplink ports transmit/receive optical signals to/from
Expansion Hub(s) using industry-standard 62.5µm/125µm MMF cable. There are
four MMF ports (labeled
1, 2, 3, and 4) on the Main Hub’s front panel. Each MMF
port has two female ST optical connectors: one for downlink (output) and one for
uplink (input).
• MMF Downlink Connector
This female ST connector (labeled
DOWN) is used to transmit the downlink optical
signals to an attached Expansion Hub.
• MMF Uplink Connector
This female ST connector (labeled
UP) is used to receive the uplink optical signals
from an attached Expansion Hub.
Figure 3-3 MMF Downlink/Uplink Ports on the Main Hub
Port Disconnect Memory
The Main Hub detects when active fiber is connected to its MMF ports. An alarm is
issued and latched if an active fiber cable from an MMF port on the Main Hub or an
attached Expansion Hub is disconnected. The port disconnect memory and major
alarm are cleared if you reconnect the fiber into the same functioning port. The error
latch remains active until power is cycled. If you do not want to use that port, you
should cycle the Main Hub’s power to clear the port disconnect memory and the error
latch.
Uplink/Input from Expansion Hub
Downlink/Output to Expansion Hub
Female ST optical connector
Female ST optical connector
AC POWER
LGCell
TM
Main Hub
SYNC
POWER
LINK
SYNC
STATUS
DOWN
UP
1
LINK
SYNC
STATUS
DOWN
UP
2
LINK
SYNC
STATUS
DOWN
UP
3
LINK
SYNC
STATUS
DOWN
UP
4
TO EXPANSION HUB PORTS