TD140 Hardware Maintenance Guide 7.13.2
19
2
TD140 Chassis Subsystem
Rev. 001-140228
describes the PEM operating conditions according to the PEM LED indicators.
Frame-Ground Connections
The chassis provides two frame-ground connection studs at the left rear part of the chassis. A
ground cable should connect at least one of these frame-ground connection studs to the high-
quality external ground used by the other equipment in your facility (or in the same rack).
The two studs permit the use of a double lug grounding connection to the platform frame to
prevent rotation.
shows the chassis ground connection at the rear of the TD140.
Figure 2.8 - TD140 Chassis Ground Connection
ESD Wrist Strap Terminals
A terminal for attaching an ESD wrist strap is located at the upper front and left rear of the
chassis.
Table 2.4 - PEM LED Indicators
LED
Color
State
Condition
Hot-swap LED
Blue
On
PEM can be extracted safely.
Blinking
IPMC is attempting to communicate with the Shelf
Management Controller (ShMC).
Off
The PEM is in its normal operating state.
Alarm LED
Red
On
PEM is experiencing problems.
Off
PEM operates normally.
OK LED
Green
On
Power is adequate.
Off
Power is inadequate.
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