Gigabit Ethernet & 16-E1 ADM Multiplexer (RC7020)

Overview

Targeted at ADM applications, the RC7020 multiplexes a Gigabit Ethernet line with 88 E1 lines over a 1.25Gb/s optical fiber. The RC7020 provides dual 1.25Gb/s optical ports and dual GMII interfaces for interfacing to external switches. E1 and Ethernet traffic are protected with rapid protection switching in a ring network topology when a fault occurs. The RC7020 incorporates an HDLC controller for communications among network elements, and two E1 user-channels for auxiliary functions.

Features

• Provides LA / LB Optical Line Interfaces
•  With Raycom’s unique E2RING technique, the RC7020 multiplexes GE and 88 E1 lines over a 1.25Gb/s optical fiber with wire speed transmission of 1000Mb/s
•  SFP modules can be directly interfaced to the RC7020 1.25Gb/s LVDS ports with no glue logic required
•  Supports line loop-back towards the equipment side for testing
•  Provides EXIST, NOP, LOF, LOM, RDI, EXC alarms
•  Supports performance monitoring
•  Supports ALS (Automatic Laser Shutdown) and RPD (Remote Power-down Detection) functionality
•  I2C interface for SFP control
•  GMIIC/GMIID Ethernet Interface
•  Provides two GMII interfaces for connection to external switches
•  Multiplexes two 1000Mb/s Ethernet ports to optical ports (LA & LB) independently
•  ELB(Ethernet Loop-back Block) function stops Ethernet traffic when a line loop-back occurs
•  Complies with IEEE802.3-2000
•  E1 Traffic Interface
•  Complies with G.703, G.742, and G.823
•  HDB3 or NRZ is selectable
•  Single chip provides 16 E1 ports
•  Five cascaded chips support 88 E1 ports
•  Each E1 can be configured in pass-through mode
• for transferring between LA and LB
•  Each E1 interface can be assigned to any timeslot of LA or LB
•  Supports P2P, P2DP, Chain, and Ring Topologies
•  Self-Healing
•  Supports E1 fast protection for P2P and Ring
•  Supports Ethernet fast protection for P2P and
• Ring
•  Supports protection for HDLC, ATD (Automatic
• Topology Discovery) channels
•  SPI Interface
•  Supports SPI ‘slave’ mode, up to 20MHz
•  Supports R / W for single-byte and byte-streams
•  Interruption
•  Provides interruption for HDLC data RX / TX
•  Provides MAC address-table refresh interruption
•  Supports interrupt mask
•  Network Management
•  Built-in HDLC controller for remote
• communication
•  Supports the ATD function
•  Provides built-in E1 BERT
•  XE1 OH Interface
• Provides two additional E1 user-channels. HDB3
• or NRZ encoding are selectable
•  Configurable as a UART channel for
• asynchronous communication among network
• elements
•  Other Characteristics
•  2.5V/1.2V power supplies
•  PBGA320 package
•  Maximum power consumption：Less than 1W

Functional Block Diagram

Figure  Functional Block Diagram

Application

• GE+16/88E1 ADM Application

Figure 1 GE+16/88E1 ADM Application

•  Topology Capabilities

Figure 2 Topology Capabilities