NEC Xen Master System Hardware Manual page 131

System Hardware Manual
Pressing SW2 interrupts all service and causes
!
a second initialization. This switch should not
be used in an operating system unless
absolutely necessary.
System boot by EPROM
On
Off
SW3-2
Off Not Used
3.3.3 Connectors
Before programming System Data, the battery must be
connected to CN4 to allow memory retention if a power
failure or brownout occurs. If a brownout or power failure
does occur, and the battery backup circuit is not activated,
System Data resets to the default values, all stations in the
system reset to the default values, and any data
programmed on individual stations is cleared.
The following connectors are located on the MBD-
U13 ETU.
✆
MOH IN
✆
PFT
✆
COM1
✆
COM2
✆
CN4
✆
CN5
✆
CN6
✆
AMP1
✆
AMP2
✆
CN403
System boot by Flash ROM
Description
For Music on Hold input
For Power Failure Transfer
For LCR/PC programming
For SMDR
For backup battery
Connects to CN1 of the CLKG-U13
Unit
Connects to CN2 of the CLKG-U13
Unit
MDF cabling connection for slots 1, 3,
4
MDF cabling connection for slots 5, 6,
7
Power Supply connection
May 2001
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