Nortel Networks 553-3001-211 manual Microprocessors, NTAK09 1.5 Mb PRI and NTBK50 2.0 MB PRI cards

NTAK93 D-channel Handler Interface daughterboard Page 753 of 894

Faceplate LEDs

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 243.

Table 243

Faceplate LEDs

State	Definition
On (Red)	NTAK93 is equipped and disabled.
On (Green)	NTAK93 is equipped and enabled, but not necessarily
	established.
Off	NTAK93 is not equipped.

Power consumption

Power consumption is +5 V at 750 mA; +12 V at 5 mA; and –12 V at 5 mA.

Functional description

The main functional blocks of the NTAK93 architecture include the following.

Microprocessors

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.

Circuit Card Description and Installation