Vertical SBX IP 320, Installation Manual

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Expansion Main Board Unit (EMBU/NTB412) 4
-
7
Chapter 4: Board Installation
SBX IP 320 Installation Guide
Expansion Main Board Unit (EMBU/NTB412)
The Expansion Main Board Unit (EMBU), shown in Figure 4-4, provides the following:
• DKT and SLT Interface Circuits
• Ring Generation circuit
• External Relay contacts for LBC or General purpose
• Peripheral Device Decoding circuit
• Master Clock Generation circuit
• PFT circuit [CO1
⇔
the last SLT port (STA8)]
• PCM Voice Processing circuit with ACT2 (ASIC, voice switching including DSP) device
for PCM tone generation and PCM gain control.
Table 4-9
LED Indications
LED MEANING
1-1 Periodic Toggle - ON, 300 msec; OFF, 300 msec
1-2 In Use or Idle Status - ON, One or more Ports in use; OFF, Idle
1-3 Timer - Flashes every 100 msec
1-4 LCD Active Updating - Flashes every 300 msec