Table 1 Functions and features of SDH processing unit of CXL4 single board

Functions and Features

Function and Characteristics

Basic Functions

Receive and transmit 1 channel STM-4 optical signal.

Optical Interface Specifications

I-4, S-4.1, L-4.1, L-4.2 and Ve-4.2 Standard Optical Modules

Optical Module Specifications

Support optical module information detection and query.

Support laser on and off setting and laser auto shutdown function.

Service Processing

Support VC-12/VC-3/VC-4 service and VC-4-4c cascade service.

Overhead processing

Supports processing of segment overhead for STM-4 signals.

Supports the processing of channel overhead (transparent transmission and termination) and the setting and querying of J0/J1/C2 bytes.

Alarm and Performance

Provides rich alarms and performance events for easy management and maintenance of the device.

Protection Mode

Supports two-fiber, four-fiber ring multiplexing segment protection, linear multiplexing segment protection, SNCP (Sub-Network Connection Protection) protection.

Maintenance Characteristics

Supports inner loopback and outer loopback functions at the optical port level.

Supports soft reset and hard reset, soft reset does not affect the service.

Support query function of single board manufacturing information.

Support online loading function of FPGA.

Support smooth upgrading of veneer software.

Table 2 Functions and features of system control and communication unit of CXL4 single board.

Functions and Features

Functions and features

Basic Functions

Realize the configuration and scheduling functions of equipment services, monitor service performance, and collect performance events and alarm information.

Interface Specifications

Provides 10M/100M compatible Ethernet network management interface.

Provides F&f port for COA management, which is led out through the auxiliary interface board.

Provides one 10M/100M Ethernet interface for communication between the single boards.

Provide one 10M Ethernet interface for communication between main/standby master boards.

Provide RS232 interface OAM port for connecting with PC or workstation, and support RS232 DCE Modem for remote maintenance, which is led out through the auxiliary interface board.

DCC Processing Capability

Provides 40-channel DCC processing capability.

Fan alarm management

Provides fan alarm management function.

PIU Management

Provide the presence detection function of the PIU of the power access board and the failure detection function of the lightning protection module in the PIU.

Protection Mode

The system control and communication units support 1+1 hot backup.

Table 3 Functions and features of the cross-connection unit of the CXL4 single board

Functions and Characteristics

Functions and features of the cross-connect unit of the CXL4 single board

Basic functions

Completes the VC-4 non-blocking full crossover for 20 Gbit/s and the VC-12/VC-3 non-blocking full crossover for 20 Gbit/s.

Fast Emergency Channel

Provides two 4Mbit/s HDLC fast emergency channels for realizing MSP, SNCP inversion and other functions.

Service Processing

Realize flexible scheduling of services.

Adding or deleting services does not affect other services.

Supports SNCP protection at VC-3 and VC-12 levels.

Supports cascading service VC-4-4c.

Protection Mode

Cross-unit supports 1+1 hot backup, and the protection mode is non-recoverable inversion by default.

Table 4 Functions and Characteristics of the Cross-Connect Unit of CXL4 Single Boards

Functions and Characteristics

Description

Basic Functions

Provides a standard system synchronization clock.

Other Functions

Support SSM information, clock ID extraction, insertion and processing functions.

Input/Output

Supports inputting 2 channels of 2048kHz or 2048kbit/s timing signals, and provides the function of selecting external timing sources.

Supports outputting 2-channel 2048kHz or 2048kbit/s timing signals.