Functional Description - Nortel Circuit Card Installation Manual

Faceplate LEDs
Power consumption

Functional description

Microprocessors
NTAK93 D-channel Handler Interface daughterboard
NTAK09 1.5 Mb PRI and NTBK50 2.0 MB PRI cards
LEDs are located on the faceplate of the NTAK09 and NTBK50 cards. The
DCHI LED is dual-color (red and green). The LEDs are described in
Table 248.
Table 248
Faceplate LEDs
State
On (Red)
On (Green)
Off
Power consumption is +5 V at 750 mA; +12 V at 5 mA; and –12 V at 5 mA.
The main functional blocks of the NTAK93 architecture include the
following.
One microprocessor does the following:
• handles data transfer between each pair of serial ports and software
• reports the status of each port
• takes commands from software to control the activities of the ports
The microprocessors also handle some D-channel data processing in DCHI
mode.
Definition
NTAK93 is equipped and disabled.
NTAK93 is equipped and enabled, but not necessarily
established.
NTAK93 is not equipped.
Circuit Card
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Description and Installation