2-2
SAS-743TQ Backplane User's Guide
2-2 Front Connector and Pin Defi nitions
#5. Activity LED Header
The activity LED header, designated JP26,
is used to indicate the activity status of
each SAS drive. The Activity LED Header is
located on the front panel. For the Activity
LED Header to work properly, connect using
a 10-pin LED cable.
#3. MG9072 Chip
The MG9072 is an enclosure management
chip that supports the SES-2 controller and
SES-2 protocols.
Backplane
Main Power
4-Pin Connector
Pin# Defi nition
1 +12V
2 and 3 Ground
4 +5V
#4. Backplane Main Power Connectors
The 4-pin connectors, designated JP10 and
JP13, provide power to the backplane. See
the table on the right for pin defi nitions.
#1. and 2. JTAG Connector and Upgrade
Connectors
The JTAG and Upgrade connectors, des-
ignated JP47 and JP46, are used for diag-
nostic purposes. These connectors should
be used by a certifi ed and experienced
technician.
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