Huawei OSN 3500 SLQ4A N1SLQ4A SSN1SLQ4A Description

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 SLQ4A is available in one functional version, namely, N1.

Through the board version replacement function, the N1SLQ4 and the N1SLQ4A can substitute each other.

Version Mapping

Board	Start Version
N1SLQ4A	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 SLQ4A is a line board. The SLQ4A can be used on the OptiX OSN equipment series to transmit and receive STM-4 optical signals. The SLQ4A converts the received optical signals into electrical signals and sends the electrical signals to the cross-connect side. In addition, the SLQ4A 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 SLQ4A transmits and receives STM-4 optical signals, performs O/E conversion for the STM-4 optical signals, extracts and inserts overhead bytes, and generates alarm signals on the line.

Table 1 provides the functions and features of the SLQ4A.

Table 1 Functions and features of the SLQ4A

Function and Feature	SLQ4A
Basic functions	Transmits and receives 4xSTM-4 optical signals.
Specifications of the optical interface	Supports different types of standard optical interfaces, namely, the I-4, S-4.1, L-4.1, L-4.2, and Ve-4.2. The characteristics of the optical interfaces of the I-4, S-4.1, L-4.1, and L-4.2 types comply with ITU-T G.957. The characteristics of the optical interface of the Ve-4.2 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. Provides the ALS function. The optical interface supports the setting of the on/off state of a laser. Supports the usage and monitoring of the SFP optical module, which facilitates the maintenance and upgrading of the optical module.
Service processing	Supports the VC-12 services, VC-3 services, VC-4 services, and VC-4-4c concatenation services.
Overhead processing	Processes the section overheads of the STM-4 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 to four channels 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. Supports the fiber-shared MSP and SNCP. One SLQ4A supports a maximum of 4 MSP protection rings.
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 SLQ4A 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 SLQ4A.

Figure 1 Functional block diagram of the SLQ4A

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

The functional modules of the STM-4 units are described as follows:

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 SLQ4A 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 SLQ4A.

Figure 1 Front panel of the SLQ4A

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 SLQ4A has four optical interfaces. Table 1 describes the types and usage of the optical interfaces of the SLQ4A.

Table 1 Optical interfaces of the SLQ4A

Interface	Type of Interface	Usage
IN1-IN4	LC	Receives optical signals.
OUT1-OUT4	LC	Transmits optical signals.

The SLQ4A can use the swappable optical modules to facilitate maintenance.

Valid Slots

The SLQ4A can be installed in slots 1-8 and 11-16 in the subrack.

• When the cross-connect capacity is 200 Gbit/s, the SLQ4A can be installed in slots 1-8 and 11-16. When the SLQ4A is installed in slots 1-4, 15, and 16, two optical interfaces can be configured. When the SLQ4A is installed in slots 5-8 and 11-14, four optical interfaces can be configured.

Feature Code

The number code that follows the board name in the bar code is the feature code of the board. The feature code of the SLQ4A indicates the type of optical interface.

Table 1 provides the relationship between the feature code of the SLQ4A and the type of optical interface.

Table 1 Relationship between the feature code of the SLQ4A and the type of optical interface

Board	Feature Code	Type of Optical Interface
SSN1SLQ4A10	10	S-4.1
SSN1SLQ4A11	11	L-4.1
SSN1SLQ4A12	12	L-4.2
SSN1SLQ4A13	13	Ve-4.2
SSN1SLQ4A14	14	I-4
SSN1SLQ4A15	15	S-4.1
SSN1SLQ4A16	16	L-4.1
SSN1SLQ4A17	17	L-4.2
SSN1SLQ4A18	18	Ve-4.2
SSN1SLQ4A19	19	I-4
SSN1SLQ4A20	20	S-4.1
SSN1SLQ4A21	21	L-4.1
SSN1SLQ4A22	22	L-4.2

Technical Specifications of the SLQ4A

The technical specifications of the SLQ4A include the parameters specified for optical interfaces, laser safety class, mechanical specifications, and power consumption.

Parameters Specified for Interfaces

Table 1 lists the parameters specified for the optical interfaces of the SLQ4A.

Table 1 Specifications of the ports

Port type	Description
I-4	2 km STM-4 two-fiber bidirectional optical interfaces
S-4.1	15 km STM-4 two-fiber bidirectional optical interfaces
L-4.1	40 km STM-4 two-fiber bidirectional optical interfaces
L-4.2	80 km STM-4 two-fiber bidirectional optical interfaces
Ve-4.2	100 km STM-4 two-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 SLQ4A are as follows:

• Dimensions (mm): 25.4 (W) x 235.2 (D) x 261.4 (H)
• Weight (kg): 1.0

Power Consumption

The maximum power consumption of the SLQ4A at room temperature (25°C) is 17 W.

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