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RIC-155 Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-5
1.3 Functional Description
This section contains functional descriptions of the RIC-155 circuit blocks, shown
in Figure 1-3.
SDH/SONET
Link
Main Card
Ethernet
Network
Interface
CPLD
SDH/SONET
Framer
Parallel CPU Interface
MDIO/MDC Interface
Ethernet
Network
Management
Forward MII
POS Level 2t
Interface
Fiber Optic/
Electrical
Interlace
Power
Supply
CPU
Figure 1-3. RIC-155 Block Diagram
• Ethernet network interface supports interfacing with Ethernet network. The
Ethernet interface is based on a multiport Fast Ethernet bridge with quality of
service support. The ports of the Fast Ethernet bridge perform the following
functions:
Data transmission over SDH/SONET link
Management from the local terminal
Interconnection between bridge and CPU
MAC MII configuration.
• CPLD is a high performance lattice programming device responsible for:
Interfacing between MII port of the Fast Ethernet bridge and Level 2 POS
interface of the SDH/SONET framer
Providing MUX functions of SNI CPU interface
Providing parallel CPU interface
Managing front panel LEDs.