Panasonic KX-T336 System Reference Manual page 1441

2.04 Changes of the Shelf Status
Removing the Expansion Shelf
When attempting to remove the expansion shelf,
the status of devices (slot, port, resource) in the
target shelf should be changed to "Not-installed"
beforehand.
When you change the status of target shelf, the
status of devices in the shelf changes as follows.
1. INS OUS
Expansion Shelf INS
Slot INS
Port INS
Resource INS
No changes in other status
2. OUS INS
Expansion Shelf OUS
Slot OUS
Port OUS
Resource OUS
No changes in other status
3. INS Fault
Expansion Shelf INS
Slot INS
Port INS
Resource INS
No changes in other status.
OUS
OUS
OUS
OUS
INS
INS
Fault (defective
device)
INS
Fault (defective
device)
INS
Fault (defective
device)
Fault
Fault
Fault
Fault
14-C-5
4. Automatic recovery (Fault
Device in "Fault" status becomes in good
status without any special care.
Expansion Shelf Fault
Slot Fault
Port Fault
Resource Fault
No changes in other status.
In case of "2. OUS
Fault", don't care about "Fault" status of lower
device.
(Note)
Up to two optional Expansion Selves (1 and 2)
can be connected to the system for enlargement
of system's ability.
INS)
INS
INS
INS
INS
INS" and "3. INS