5-14 Cisco BPX 8600 Series Reference
ASI-155, ATM Service Interface Card
• Provides optional cell descrambling, header error check (HEC), and idle cell filtering.
• Provides a small FIFO buffer for incoming cells.
• Provides optical to electrical conversion.
The Line Interface Unit (LIU) performs the following egress functions:
• Inserts the appropriate framing into the outgoing bit stream.
• Inserts any alarm codes for transmission to the far end.
• Provides optional cell scrambling, HEC generation, and idle cell insertion.
• Provides a small FIFO buffer outing cells.
• Provides electrical to optical conversion.
Figure 5-7 ASI-155 Simplified Block Diagram
Monitoring Statistics
Port, line, and channel statistics are collected by the ASI-155. The StrataView Plus workstation is
used to collect and monitor these statistics. For additional information regarding ASI-155 statistics
refer to the Cisco StrataView Plus Operations Guide.
Front Panel Indicators
The ASI-155 front panel (see Figure 5-8) has a three-section, multicolored “card” LED to indicate
the card status. The card status LED is color-coded as indicated in Table 5-2. A two-section
multicolored “port” LED indicates the status of the two ports on the ASI-155. The port status LED
display is color-coded as indicated in Table 5-2.
StrataBus
Serial
Interface
Unit
(SIU)
CommBus
interface
Control/Admin
processor
Network
address table
CIE port 1
QSE port 1
CIE port 2
QSE port 2
LIU port 1
LIU port 2
LIU = Line Interface Unit
CIE = Cell Input Engine
QSE = Queue Service Engine
ALI = ATM Layer Interface
SCF = Supervisory Cell Filter
Egress
(from BCC
switching
matrix)
Ingress
(to BCC
switching
matrix)
SCF, ports
1 and 2
ALI
H8232
