Huawei OSN 3500 SSN1SL1A SL1A Supplier

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.

Version Description

The SL1A is available in one functional version, namely, N1.

Through the board version replacement function, the N1SL1A can substitute for the N1SL1.

Version Mapping

Board	Start Version
N1SL1A	V100R008C01

Board Updates

This section describes the hardware updates in V200R013C30 and later versions as well as the reasons for the updates. Any product versions that are not listed in the document means that they have no hardware updates.

Application

The SL1A is a line board. The SL1A can be used on the OptiX OSN equipment series to transmit and receive STM-1 optical signals. The SL1A converts the received optical signals into electrical signals and sends the electrical signals to the cross-connect side. In addition, the SL1A converts the electrical signals sent from the cross-connect side into optical signals and transmits the optical signals.

Figure 1 shows the application of the SDH processing boards. The SDH processing boards can form a ring network or a chain network in the system.

Figure 1 Networking and application of the SDH processing boards

Functions and Features

The SL1A transmits and receives STM-1 optical signals, performs O/E conversion for the STM-1 optical signals, extracts and inserts overhead bytes, and generates alarm signals on the line.

Table 1 provides the functions and features of the SL1A.

Table 1 Functions and features of the SL1A

Function and Feature	SL1A
Basic functions	Transmits and receives 1xSTM-1 optical signals.
Specifications of the optical interface	Supports different types of standard optical interfaces, namely, the I-1, S-1.1, L-1.1, L-1.2, and Ve-1.2. The characteristics of the optical interfaces of the I-1, S-1.1, L-1.1, and L-1.2 types comply with ITU-T G.957. The characteristics of the optical interface of the Ve-1.2 type comply with the standards defined by Huawei.
Specifications of the optical module	Supports the detection and query of the information about the optical module. Supports the usage and detection of the SFP optical module, which facilitates the maintenance and upgrading of the optical module. Provides the ALS function. The optical interface supports the setting of the on/off state of a laser. Supports the single-fiber bidirectional optical module, and the single-fiber bidirectional optical module does not support loopbacks as the optical interface by using fiber jumpers.
Service processing	Supports the VC-12 services, VC-3 services, and VC-4 services.
Overhead processing	Processes the section overheads of the STM-1 signals. Supports the transparent transmission and termination of the path overheads. Supports the setting and query of the J0, J1, and C2 bytes. Supports one channel of ECC communication.
Alarms and performance events	Reports various alarms and performance events, which facilitates the management and maintenance of the equipment.
Protection schemes	Supports the Two-fiber ring MSP, Four-fiber ring MSP, Linear MSP, SNCP, SNCTP, and SNCMP.
Maintenance features	Supports inloops and outloops at optical interfaces. Supports inloops and outloops on VC-4 paths. Supports warm resets and cold resets. The warm reset does not affect services. Supports the query of the manufacturing information of the board. Supports the in-service loading of the FPGA. Supports the upgrade of the board software without affecting services. Supports the press-to-collect function in fault data collection. Hot board swapping.

Working Principle and Signal Flow

The SL1A consists of the O/E converting module, CDR module, SDH overhead processing module, logic and control module, and power module.

Figure 1 shows the functional block diagram of the SL1A.

Figure 1 Functional block diagram of the SL1A

PLL: phase-locked loop	SPI: SDH physical interface	SDH: synchronous digital hierarchy
RST: regenerator section termination	MST: multiplex section termination	MSA: multiplex section adaptation
HPT: higher order path termination	IIC: inter-integrated circuit	CDR: clock and data recovery

O/E Converting Module

• Converts the received optical signals into electrical signals, in the receive direction.
• Converts the electrical signals into SDH optical signals, and then sends the SDH optical signals to fibers for transmission, in the transmit direction.
• The SPI detects the R_LOS alarm and provides the laser shut down function.

CDR Module

This module restores the clock signal.

SDH Overhead Processing Module

this module includes the RST, MST, MSA, and HPT sub-modules. This module provides the inloop and outloop functions.

• RST sub-module
  • In the receive direction, the RST sub-module terminates the regenerator section overhead (RSOH). That is, the RST sub-module detects the frame alignment bytes (A1 and A2), descrambles all the bytes except the first line of the RSOH, restores and checks the regenerator section trace byte (J0), and checks the B1 byte.
  • In the transmit direction, the RST sub-module generates the RSOH. That is, the RST sub-module writes bytes such as A1, A2, and J0, calculates and writes the B1 byte, and scrambles all the bytes except the first line of the RSOH.
• MST sub-module
  • In the receive direction, the MST sub-module terminates the multiplex section overhead (MSOH). That is, the MST sub-module generates the multiplex section-alarm indication signal (MS_AIS) alarm and detects the multiplex section-remote defect indication (MS_RDI) alarm after detecting the K2 byte, and detects the multiplex section-remote error indication (MS_REI) alarm and generates the B2-excessive errors (B2_EXC) alarm after checking the B2 byte.
  • In the transmit direction, the MST sub-module generates the MSOH. That is, the MST sub-module writes bytes such as E2, D4-D12, K1, K2, S1, and M1, and calculates and writes the B2 byte.
• MSA sub-module
  • In the receive direction, the MSA sub-module de-interleaves the administration unit group (AUG), divides an AUG into N AU-4s, detects the administration unit-loss of pointer (AU_LOP) alarm and the administration unit-alarm indication signal (AU_AIS) alarm, and performs pointer justifications.
  • In the transmit direction, the MSA sub-module assembles the AUG and generates the AU-4. N AU-4s are multiplexed into an AUG through byte interleaving.
• HPT sub-module
  • In the receive direction, the HPT sub-module terminates the path overhead (POH). That is, the HPT sub-module detects the higher order path-remote error indication (HP_REI) alarm after checking the B3 byte, generates the higher order path-trace identifier mismatch (HP_TIM) alarm and the higher order path-signal label mismatch (HP_SLM) alarm and detects the higher order path-remote defect indication (HP_RDI) alarm after detecting the J1 and C2 bytes, and generates the higher order path-unequipped (HP_UNEQ) alarm after detecting the C2 byte.
  • In the transmit direction, the HPT sub-module generates the POH. That is, the HPT sub-module writes bytes such as J1 and C2, and calculates and writes the B3 byte.

Logic and Control Module

• Manages and configures the other modules of the board.
• Performs inter-board communication through the internal Ethernet interface.
• Traces the clock signal from the active and standby cross-connect units.
• Controls the laser.
• Passes the orderwire and ECC bytes through an ADM that consists of two paired slots when the GSCC is not in position.
• Selects the clock signal and frame header signal from the active and standby cross-connect units.
• Controls the indicators on the board.

Power Module

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

Front Panel

The front panel of the SL1A has indicators, interfaces, a bar code, and a laser safety class label.

Diagram of the Front Panel

Figure 1 shows the appearance of the front panel of the SL1A.

Figure 1 Front panel of the SL1A

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)

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

Interfaces

The front panel of the SL1A has one optical interface. Table 1 describes the types and usage of the optical interfaces of the SL1A.

Table 1 Optical interfaces of the SL1A

Interface	Type of Interface	Usage
IN	LC	Receives optical signals.
OUT	LC	Transmits optical signals.

Valid Slots

The slots valid for the SL1A vary with the cross-connect capacity of the subrack.

 NOTE:

The slots valid for a board are determined by the following factors:

• Slot bandwidth
• Cross-connect capacity
• Board version

The slots valid for the SL1A are as follows:

• When the cross-connect capacity is 200 Gbit/s, the SL1A can be installed in slots 1-8 and 11-17.

Technical Specifications of the SL1A

The technical specifications of the SL1A include the parameters specified for optical interfaces, laster safety class, mechanical specifications, and power consumption.

Parameters Specified for Interfaces

Table 1 lists the parameters specified for the optical interfaces of the SL1A.

Table 1 Specifications of the ports

Port type	Description
I-1	2 km STM-1 two-fiber bidirectional optical interfaces
S-1.1	15 km STM-1 two-fiber bidirectional optical interfaces
L-1.1	40 km STM-1 two-fiber bidirectional optical interfaces
L-1.2	80 km STM-1 two-fiber bidirectional optical interfaces
Ve-1.2	100 km STM-1 two-fiber bidirectional optical interfaces
S-1.1	15 km STM-1 single-fiber bidirectional optical interfaces
L-1.1	40 km STM-1 single-fiber bidirectional optical interfaces

Laser Safety Class

The safety class of the laser on the board is Class 1. The maximum launched optical power of the optical interfaces is less than 10 dBm (10 mW).

Mechanical Specifications

The mechanical specifications of the SL1A are as follows:

• Dimensions (mm): 25.4 (W) x 235.2 (D) x 261.4 (H)
• Weight (kg): 0.6

Power Consumption

The maximum power consumption of the SL1A at room temperature (25°C) is 17 W.

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