System Installation Manual
Digital Key Telephone System
22
DV
4.3 D4MBUB(C) (Mother Board Unit)
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Figure 3: DV-22 Mother board Unit (D4MBUB)
1.
CPU
2.
System Software EEPROM
3.
System Software RAM backup battery Switch
4.
System Software RAM backup battery
5.
Key phone port connector
6.
Trunk port connector
7.
D4VSCA card connector
8.
Standard card expansion connector
9.
D4PWUA power adapter connector
10.
D4MFCA/D4MFCB Multi-function card connector
11.
D4TKUA trunk expansion connector
12.
System working Indicator
13.
Music on hold Switch (Internal/ External)
14.
The volume controller of the Internal Music on hold
15.
Battery Reverse Protect Fuse: 2A/250V
Aristel Networks Pty Ltd
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