Faceplate Leds; Power Consumption; Functional Description; Microprocessors - Meridian Nortel 1 Option 11C Technical Reference Manual

Faceplate LEDs

Table 160
Faceplate LEDs
State
On (Red)
On (Green)
Off

Power consumption

Functional description

Microprocessors

DMA controller

Random Access Memory (RAM)

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
DCH LED is dual-color (red and green), with states represented as follows:
NTAK93 is equipped and disabled.
NTAK93 is equipped and enabled, but not necessarily established.
NTAK93 is not equipped.
Power consumption is +5V at 750mA; +12V at 5mA; and -12V at 5mA.
The main functional blocks of the NTAK93 architecture include the
following.
One microprocessor handles data transfer between each pair of serial ports
and software, reports the status of each port and takes commands from
software to control the activities of the ports. The microprocessors also do
some of D-channel data processing in DCHI mode.
A Z80A-DMA chip controls the data transfer between local RAM memory
and communication ports. Note that the DMA channels will only be used in
the receive direction (from line to CPU), not in the transmit direction.
A total of 32K bytes of RAM space for each pair of ports is used as the
communication buffer and firmware data storage.
NTAK93 D-channel handler interface
Definition
Option 11C and 11C Mini
Page 515 of 544
Technical Reference Guide