Mbd-U13 Unit For B48-U13 Ksu (Xen Axis Only) - NEC Xen Master System Hardware Manual

System Hardware Manual
3.3

MBD-U13 Unit for B48-U13 KSU (Xen Axis Only)

3.3.1 Description
The MBD-U13 Unit (installed on the B48-U13 KSU) is the
Central Processing Unit for the Xen Axis system. This ETU
has a Central Processing Unit and a Microprocessing Unit
and supports a maximum of 48 ports. Refer to Figure 5-10
KSU MBD-U13 Unit.
A 32-bit microprocessor executes the programs stored on
the Flash ROM ICs of the MBD-U13 Unit. This controls the
entire system when data is transferred to and from
other ETUs.
This ETU includes the following items:
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Time Division Switch (TDSW)
Static Random Access Memory (SRAM)
32-bit Processor
4-channel DTMF Receiver (PBR)
Sixteen 4-party Conference Circuits
Internal (digital music) Music-on-Hold source
External Music-on-Hold input (also used for station
background music)
Flash ROM
Call Progress and DTMF Tone Generator
Memory backup Battery (Retains memory for
approximately 21 days)
8 Electronic Station Interface (ESI) ports
6 Flexible Card Slots
May 2001
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