Nortel Networks 1000 - Manual (Page 864)

864 NTBK22 MISP card
The NTBK22 MISP Card interfaces with the S/T Interface Line Cards
(SILCs) and the U Interface Line Cards (UILCs). The main functions of the
MISP are as follows:
• communicate with the Call Server CPU to report ISDN BRI status and
receive downloaded application software and configuration parameters
•
manage Layer 2 and Layer 3 signaling that controls call connection
and terminal identification
•
control terminal initialization and addressing
•
assign B-channels for switched voice and data transmission by
communicating with the BRI terminal over the D-channel and allocating
to it an idle B-channel with appropriate bearer capabilities
• separate D-channel data from signaling information and route the data
to the packet handler
• send call control messages to ISDN BRI terminals over the D-channel
Micro Processing Unit (MPU)
The MPU coordinates and controls data transfer and addressing of the
peripheral devices and communicates with the CPU using a message
channel on the CPU bus. The tasks that the MPU performs depend on the
interrupts it receives. The interrupts are prioritized by the importance of
the tasks they control.
The MPU coordinates and controls data transfer and addressing of the
peripheral devices and communicates with the Meridian 1 CPU using a
message channel on the CPU bus. The tasks that the MPU performs
depend on the interrupts it receives. The interrupts are prioritized by the
importance of the tasks they control.
High-Level Data Link Controller (HDLC)
The HDLC is a format converter that supports up to 32 serial channels that
communicate at speeds up to 64 kbps. The HDLC converts messages into
the following two message formats:
• a serially transmitted, zero-inserted, CRC protected message that has
a starting and an ending flag
• a data structure
The HDLC is a format converter that supports up to 32 serial channels that
communicate at speeds up to 64 kbps. The HDLC converts messages into
the following two message formats:
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.