What is Huawei OSN 3500 SXCSA

OSN 3500 is a new-generation optical transmission system developed by Huawei. It adopts a unified switching architecture and can function as an MPLS/MPLS-TP-based packet device or a TDM device. When working with other devices of Huawei, OSN 3500 supports various networking modes, including the pure packet mode, hybrid networking (packet + TDM) mode, and pure TDM mode, achieving optimal processing for packet services and traditional SDH services. Thus, OSN 3500 efficiently transmits voice and data services over the same platform.

Application

The SXCSA is a super cross-connect and synchronous timing board. The SXCSA provides service grooming and clock input/output functions in the OptiX OSN system.

The cross-connect and synchronous timing board provides the other boards in the system with the timing information, converges and grooms services, communicates with the other boards in the system, and performs the configuration and management functions for the other boards in the system.

Figure 1 shows the position of the cross-connect and synchronous timing board in the OptiX OSN system.

Figure 1 Position of the cross-connect and synchronous timing board in the system

 NOTE:

PCM boards are available only in V200R013C00 or later.

Smart line boards are available only in V200R015C20 and later.

Functions and Features

The SXCSA grooms services and inputs/outputs clock signals.

Cross-Connect Unit

Table 1 provides the functions and features of the cross-connect unit of the SXCSA.

Table 1 Functions and features of the cross-connect unit of the SXCSA

Function and Feature	SXCSA
Basic functions	Realizes 200 Gbit/s higher order cross-connection at the VC-4 level, 20 Gbit/s lower order cross-connection at the VC-3 or VC-12 level, and 155 Gbit/s access.
Service processing	Supports the flexible service grooming and supports the fully non-blocking cross-connect, multicast, and broadcast services. Enables the communication between the SXCSA and the other boards. Supports the tact switch and performs the protection switching without interrupting services. Supports the SNCP protection at the VC-4-4c, VC-4-8c, VC-4-16c, VC-4-64c, VC-4, VC-12, VC-3, and AU-3 levels. Supports VC-4-4c, VC-4-8c, VC-4-16c, and VC-4-64c concatenation services. Supports a maximum of 40 linear MSP groups. Supports a maximum of 12 ring MSP groups. Supports a maximum of 2016 SNCP groups. Supports a maximum of 592 SNCMP groups. Supports a maximum of 512 SNCTP groups.
Protection schemes	Supports the 1+1 Hot Backup for the Cross-Connect and Timing Units (non-revertive, by default).
Maintenance feature	Hot board swapping.

Clock Unit

Table 2 provides the functions and features of the clock unit of the SXCSA.

Table 2 Functions and features of the clock unit of the SXCSA

Function and Feature	SXCSA
Basic functions	Provides the standard system synchronization clock.
Other functions	Supports the processing of the S1 byte to realize the clock protection switching. Supports the extraction, insertion, and management of the SSM and clock ID. Provides the real-time clock (RTC).
Input and output	Through the AUX board: Inputs/Outputs two-channel 2 MHz or 2048 kbit/s timing signals (75-ohm) and allows selection of external timing sources. Inputs/Outputs two-channel 2 MHz or 2048 kbit/s timing signals (120-ohm) and allows selection of external timing sources.

Working Principle and Signal Flow

The SXCSA consists of the synchronous timing module, cross-connect module, communication and control module, and power module.

Figure 1 shows the functional block diagram of the SXCSA.

Figure 1 Functional block diagram of the SXCSA

SETG: synchronous equipment timing generation function

The functional modules of the cross-connect and synchronous timing boards are described below.

Synchronous Timing Module

The synchronous timing module uses the centralized timing allocation mode as the clock mode. The synchronous timing module also selects one clock source from reference clock sources as the reference clock for the timing module. The reference clock sources are from the line board, the tributary board, or the external synchronous clock source. The synchronous clock source and 2 Mbit/s or 2 MHz external synchronous clock source are then generated.
The precise 38 MHz oscillator ensures that the reference clock complies with ITU-T standards in free-run mode.

The SDH clock (SETS) can work in the following modes:

• Lock mode
• Hold-over mode
• Free-run mode

When working in lock mode, the SETS extracts the clock from three types of timing signals:

• Timing signal (T1) from the STM-N line
• Timing signal (T2) from the PDH line
• Reference signal (T3) from the external synchronous clock source (2 MHz or 2 Mbit/s)

The timing module outputs the following timing signals:

• T0, system clock
• T4, external timing output signal (2 Mbit/s or 2 MHz)

Cross-Connect Module

The cross-connect module consists of two parts:

• SNCP module, which tests relative alarms and reports the alarms to the software to trigger the protection switching such as the SNCP switching and MSP switching.
• Higher order and lower order cross-connect module, which performs the functions of higher order and lower order cross-connect units.

Communication and Control Module

The communication and control module is a sub-system provided by the pinch board. It consists of the CPU, register, Ethernet port, HDLC controller, FPGA loading controller, and bus driver. This module is connected to external circuits through buses to manage and configure other units of the boards.

Power Module

It converts the -48/-60 V power supply into the DC voltages that the modules of the board require.

Front Panel

The front panel of the SXCSA has indicators and a bar code.

Diagram of the Front Panel

Figure 1 shows the appearance of the front panel of the SXCSA.

Figure 1 Front panel of the SXCSA

Indicators

The front panel of the board has the following indicators:

• Board hardware status indicator (STAT) - two colors (red and green)
• Service activation status indicator (ACT) - one color (green)
• Board software status indicator (PROG) - two colors (red and green)
• Service alarm indicator (SRV) - three colors (red, green, and yellow)
• Synchronization clock status indicator (SYNC) - two colors (red and green)

For the meanings of the status of the indicators, see Indicators.

Interfaces

The front panel of the SXCSA has no interface. The AUX provides the SXCSA with the external clock interface that can be set in 2048 kHz mode or 2048 kbit/s mode. The AUX provides two BITS clock interfaces with 120-ohm or 75-ohm impedance. For details, see AUX.

Jumpers and DIP Switches

The SXCSA does not have any jumpers or DIP switches that are used for board settings.

Valid Slots

The SXCSA must be installed in a valid slot in the subrack. Otherwise, the SXCSA cannot work normally.

The SXCSA can be installed in slots 9 and 10 in the subrack. By default, slot 9 houses the active board and slot 10 houses the standby board.

Feature Code

The SXCSA does not have the feature code.

Technical Specifications of the SXCSA

The technical specifications of the SXCSA include the mechanical specifications, and power consumption.

Mechanical Specifications

The mechanical specifications of the SXCSA are as follows:

• Dimensions (mm): 40.0 (W) x 235.2 (D) x 261.4 (H)
• Weight (kg): 2.2

Power Consumption

The maximum power consumption of the SXCSA at room temperature (25°C) is 63 W.


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