NTBK51Downloadable D-channel handler Page521 of 544
Option11C and 11C Mini Technical ReferenceGuide
LEDs are located on the faceplate of the NTAK09/NTBK50 card. The DCH
LED is a dual-color (red/green), with the states represented as follows:
Functional description
The main functional blocks of the NTBK51 architecture include the
following:
•Microprocessors
•Main memory
•Shared memory
•EPROM memory
•Flash EPROM memory
•EEPROM memory
•Serial communication controller
•Sanity timer
•Bus timer
Microprocessors
One microprocessor h andles data transfer between each serial i nterface and
software, reports the status of each port and takes commands from software
to control the activities of the ports. A high performance MPU supports the
D-channel from the PRI card and other software applications running
simultaneously on other ports of the DDCH card.
Table 1 61
Faceplate LEDs
State Definition
On (Red) NTBK51 is disabled.
On (Green) NTBK51 is enabled, but not necessarily established
Off NTBK51 is not equipped.