Cisco Systems 8600 Series manual Simplified BNI-155 Block Diagram

Broadband Network Interface Cards, BNI-155

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 4-6 Simplified BNI-155 Block Diagram

CommBus	Control/Admin	LIU = Line Interface Unit
Iinterface	processor	CIE = Cell Input Engine
		QSE = Queue Service Engine

StrataBus

Ingress (to BCC switching matrix)

Egress (from BCC switching matrix)

	Network
	address table
Serial	CIE port 1
Interface
Unit	CIE port 2
(SIU)
	QSE port 1
	QSE port 2

LIU port 1

LIU port 2

H8229

Front Panel Indicators

The BNI-155 front panel (see Figure 4-7)has a three-section, multicolored “card” LED to indicate the card status. The card status LED is color-coded as indicated in Table 4-4.A three-section multicolored “port” LED indicates the status of the two ports on the BNI-155. Types of failures are indicated by various combinations of the card status indicators as indicated in Table 4-5.

Network Interface (Trunk) Cards 4-13