Vertical Edge 120 Specifications download pdf (Page 25)

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DX-120 Installation and Maintenance Manual OVERVIEW

408M - KSU1 Component (continued)

• The fourth CO line port is equipped with CNG fax tone detection circuitry. When programmed as a “FAX” line,

this circuit will automatically engage the FAX Tone detector. If FAX tone is detected, the system routes the

call to the analog port designated as the destination for fax calls.

• Each digital port (connects to Digital Executive Telephones and DSS Consoles) is comprised of a proprietary

octal ASIC (Application Specific Integrated Circuit) transceiver. There are three data channels in operation at

each digital port via the octal transceiver. One channel is used for call processing control of digital terminal

functions/operations and two channels are used for the digital voice channel requirements.

• Each digital station interface is protected against circuit wiring shorts by an over-current protection polyswitch.

The digital station circuit requires only one cable pair to operate and is not polarity sensitive.

• Physical connection of digital extensions, power failure telephones, and CO lines to the 408M module is made

through convenient RJ-11 connectors along the bottom edge of the module.

408E (KSU II Component)

The 408E is very similar to the 408M; however, it is unique to KSU2. The 408E provides interface for up to 4

loop-start CO lines and 8 digital extension ports. In addition, the 408E regulates the 24-volt DC power from the

source to produce all required logic voltages and operations voltages. There is also a power failure port located on

the 408E that is associated to the first CO line circuit. Whenever power fails this port becomes active with dial tone

from the CO line connected to the first CO line port.

KSU2

• The 408E is equipped with a heartbeat LED that indicates processing activity on the PCB; the 408E peripheral

processor is operating when the heartbeat LED is flashing. The KSU2 operation LED (located next to the

power switch) is tied to the 408E heartbeat LED, therefore, when the LED next to the power switch is

flashing, the 408E is active.

• The KSU2-408E connections are almost identical to those on the 408M (KSU1); the exception is the long

shielded cable used to connect KSU2 to the CPM inside of KSU1.

NOTE

There is no standard APM4 installed inside of KSU2. However, one can be

connected using the dedicated cable.

408E - KSU2 Component (continued on next page)

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Vertical Edge 120 Specifications Page 25