Huawei OSN SLO1 SSN2SLO1 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 SLO1 is available in two functional versions, namely, N2 and N3. The difference between the two versions is with regard to whether they support the TCM function and AU-3 services. The N3SLO1 is discontinued.

Table 1 describes the versions of the SLO1.

Table 1 Versions of the SLO1

Item	Description
Functional versions	The SLO1 is available in two functional versions, namely, N2 and N3.
Differences	Service processing: AU-3 service processing. Maintenance features: loopbacks on VC-4 paths, TCM function, and PRBS function.
Substitution	When the N2SLO1 is not configured with the TCM function and AU-3 services, the N3SLO1 can substitute for the N2SLO1.

 NOTE:

When you configure the MSP or SNCP, you cannot configure the N3SLO1 as the protection board if the working board is the N2SLO1 on which the TCM function is enabled or AU-3 services are configured. Otherwise, the services are interrupted when a switching operation is performed.

Version Mapping

Board	Start Version
N2SLO1	V100R006C01
N3SLO1	V100R009C02

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 SLO1 is a line board. The SLO1 can be used on the OptiX OSN equipment series to transmit and receive STM-1 optical signals. The SLO1 converts the received optical signals into electrical signals and sends the electrical signals to the cross-connect side. In addition, the SLO1 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 SLO1 transmits and receives 8xSTM-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 SLO1.

Table 1 Functions and features of the SLO1 board

Function and Feature	SLO1
Basic functions	Receives and transmits 8xSTM-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. Provides the ALS function. The optical interface supports the setting of the on/off state of a laser. Supports the usage and detection 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, and VC-4 services. The N2SLO1 supports the AU-3 services.
Overhead processing	Processes the section overheads of the STM-1 signals. Processes the path overheads. Supports the setting and query of the J0, J1, and C2 bytes. Supports one to eight 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.
Maintenance features	Supports inloops and outloops at optical interfaces. The N3SLO1 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. The N2SLO1 supports the TCM function. The N3SLO1 supports the PRBS function. For details, see Availability. Supports the press-to-collect function in fault data collection. Hot board swapping.

Working Principle and Signal Flow

The SLO1 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 SLO1.

Figure 1 Functional block diagram of the SLO1

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 SLO1 has indicators, interfaces, a bar code, and a laser safety class label.

Diagram of the Front Panel

Figure 1 and Figure 2 show the appearance of the front panel of the SLO1.

Figure 1 Front panel of the SLO1 (with level optical interfaces)

Figure 2 Front panel of the SLO1 (with slanting optical interfaces)

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 SLO1 has eight optical interfaces. Table 1 describes the types and usage of the optical interfaces of the SLO1.

Table 1 Optical interfaces of the SLO1

Interface	Type of Interface	Usage
IN1-IN8/RX1-RX8	LC	Receives optical signals.
OUT1-OUT8/TX1-TX8	LC	Transmits optical signals.

 NOTICE:

For SLO1 boards with level optical interfaces, use optical attenuators only on the ODF side.

Valid Slots

The slots valid for the SLO1 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 SLO1 are as follows:

• When the cross-connect capacity is 200 Gbit/s, the SLO1 can be installed in slots 1-8 and 11-17. In this case, eight 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 SLO1 indicates the type of optical interface.

Table 1 provides the relationship between the feature code of the SLO1 and the type of optical interface.

Table 1 Relationship between the feature code of the SLO1 and the type of optical interface

Board	Feature Code	Type of Optical interface
SSN2SLO110 and SSN3SLO110	10	S-1.1
SSN2SLO111 and SSN3SLO111	11	L-1.1
SSN2SLO112 and SSN3SLO112	12	L-1.2
SSN2SLO113 and SSN3SLO113	13	Ve-1.2
SSN2SLO114 and SSN3SLO114	14	I-1
SSN2SLO115	15	S-1.1
SSN2SLO116	16	L-1.1
SSN2SLO117	17	L-1.2

Technical Specifications of the SLO1

The technical specifications of the SLO1 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 SLO1.

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

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 N2SLO1 are as follows:

• Dimensions (mm): 25.4 (W) x 235.2 (D) x 261.4 (H)
• Weight (kg): 1.1

The mechanical specifications of the N3SLO1 are as follows:

• Dimensions (mm): 25.4 (W) x 235.2 (D) x 261.4 (H)
• Weight (kg): 1.2

Power Consumption

The maximum power consumption of the N2SLO1 at room temperature (25°C) is 26 W.

The maximum power consumption of the N3SLO1 at room temperature (25°C) is 20 W.

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