NEC Univerge SV8500 Operation And Maintenance Manual page 154

If the MBR or MB key is set to upward, the GT card is placed in make-busy status. Return the key to the
Note:
original position (downward).
Be sure to use "MBR" key on the ACT GT card. If "MB" key is operated before operating
WARNING
"MBR" key on the ACT GT card, the card will be reset. During this initialization, all channels
that are related to this card will be placed in MB status, disconnecting all active calls.
STEP 3 Confirm the changed lamp indications.
• See the figure below to check the lamp indications.
Figure 2-18 LED Indications Before and After Speech Path System Changeover
Before
DLKC TSW
OPE/MB TSW ACT
MB
MB
TSW MBR
STEP 4 Make test calls to see that the TSW card is operating normally.
STEP 5 Analyze system messages.
• When TSW ACT/STBY is changed, system Messages 7-E, 7-F, and 1-T will be issued.
MUX
MUX ACT
MB
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CHAPTER 2 Operations of SV8500 Server
Meaning
After
DLKC TSW
OPE/MB TSW ACT
MB
MB
TSW MBR
ON
OFF
MUX
MUX ACT
MB