NEC Univerge sv8500 Manual page 2595

6. External Switch (External Key Box)
6.1 General
External Switch is used to change over DAY/NIGHT mode and other status of the system such as Class of Ser-
vice by operating the External Switch. Eight keys are provided on the External Switch. As an interface card be-
tween the equipment and the Telephony Server, PFT circuit card is required.
The K0 through K7 keys are operative only when the EFCT keys are in the UP position. To turn on a circuit,
set the corresponding key (K0-K7) in the UP position.
E F C T K
D K 1 K
2 K 3 K
External Switch (Key Box)
6.2 Installation Procedure
STEP 1: Mount the External Switch by using AY plugs, curl plugs, board plugs, etc.
STEP 2: Run the cables between the equipment and the MDF referring to the figure listed on the next page.
STEP 3: Run the cables between the External Switch and the PRT terminal on the BASEU.
STEP 4: Protect the cables by using cable duct, etc.
STEP 5: Terminate the installed cables to the External Switch and the MDF.
STEP 6: Referring to Port Accommodation Sheet and the Circuit Card Manual, identify the lead names for the
LT connector and the leads' locations.
STEP 7: Provide the necessary cross connections on the MDF.
External Switch (External Key Box) Outer view
4 K 5
K 6 K 7
CHAPTER 2
MDF
VOL.3-108
TERMINAL-RELATED DEVICES
PFT
Telephony Server