Huawei OSN 3500 SL16A N1SL16A N2SL16A N3SL16A Details

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 SL16A is available in the following functional versions: N3, N2, and N1. The N1SL16A and N2SL16A are discontinued.

Table 1 describes the versions of the SL16A.

**Table 1** Versions of the SL16
Item	Description
Functional versions	The SL16A is available in the following functional versions: N3, N2, and N1. The N1SL16A and N2SL16A are discontinued.
Differences	Specifications of optical interfaces: DWDM colored optical interfaces. Service processing: AU-3 service processing. REG specifications: REG function. Maintenance features: loopbacks on VC-4 paths and TCM function.
Substitution	The N1SL16A and N2SL16A cannot be substituted with each other. The N3SL16A supports the board version replacement function. The N3SL16A can substitute for the N1SL16A. When the AU-3 services are not configured, the N3SL16A can substitute for the N2SL16A. After the N3SL16A substitutes for the N1SL16A or N2SL16A, the configuration and service status of the N3SL16A are the same as the configuration and service status of the N1SL16A or N2SL16A.

NOTE:

In the case of the board of different versions, adhere to the following principles when configuring the MSP or SNCP:

You cannot configure the N1SL16A as the protection board if the working board is the N2SL16A or N3SL16A on which only the TCM function is enabled. Otherwise, the services are interrupted when a switching operation is performed.
You cannot configure the N3SL16A or N1SL16A as the protection board if the working board is the N2SL16A on which only the AU-3 services are configured. Otherwise, the services are interrupted when a switching operation is performed.

Version Mapping

Board	Start Version
N1SL16A	V100R001C03
N2SL16A	V100R002C02
N3SL16A	V100R003C01

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 SL16A is a line board. The SL16A can be used on the OptiX OSN equipment series to transmit and receive STM-16 optical signals. The SL16A converts the received optical signals into electrical signals and sends the electrical signals to the cross-connect side. In addition, the SL16A 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 SL16A receives and transmits 1xSTM-16 optical signals, processes overhead bytes, and performs the MSP.

Table 1 describes the functions and features of the SL16A.

**Table 1** Functions and features of the SL16A
Function and Feature	Description
Basic functions	Transmits and receives 1xSTM-16 optical signals.
Specifications of the optical interface	Supports different types of standard optical interfaces, namely, the I-16, S-16.1, L-16.1, and L-16.2. The characteristics of the optical interfaces comply with ITU-T G.957 and ITU-T G.692. The N3SL16A supports U-16.2Je (with the BA and pre-amplifier (PA)). The characteristics of the optical interfaces of the U-16.2Je (with the BA and PA) comply with the standards defined by Huawei. U-16.2Je is compatible with U-16.2. The N3SL16A supports the CWDM and DWDM colored optical interfaces. The optical interface uses the LC connector. The CWDM optical interface supports the transmission distance of 80 km, and the DWDM optical interface supports the transmission distance of 120 km.
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, VC-4-4c concatenation services, VC-4-8c concatenation services, and VC-4-16c concatenation services. The N2SL16A supports the AU-3 services.
Overhead processing	Processes the section overheads of the STM-16 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.
Specifications of the REG	The N2SL16A/N3SL16A board supports the setting and query of the REG working mode. With the REG function enabled, the board is in RS loopback mode and processes only the regeneration section overhead.
Protection schemes	Supports the Two-fiber ring MSP. Supports the Four-fiber ring MSP. Supports the Linear MSP. Supports the SNCP. Supports the SNCMP. Supports the SNCTP. Supports the fiber-shared virtual trail protection. Supports the fiber-shared MSP and processes two sets of K bytes. One SL16A supports a maximum of two MSP rings.
Maintenance features	Supports inloops and outloops at optical interfaces. The N1SL16A supports inloops on VC-4 paths. The N3SL16A board 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. The N2SL16A/N3SL16A board supports the TCM function. Supports the upgrade of the board software without affecting services. 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 SL16A consists of the O/E converting module, MUX/DEMUX module, SDH overhead processing module, logic and control module, and power module.

Figure 1 shows the functional block diagram of the SL16A.

Figure 1 Functional block diagram of the SL16A

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	-	-

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.

MUX/DEMUX Module

In the receive direction, the DEMUX part demultiplexes the high rate electrical signals into multiple parallel electrical signals, and recovers the clock signal at the same time.
In the transmit direction, the MUX part multiplexes the parallel electrical signals received from the SDH overhead processing module into high rate electrical signals.

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 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 J0 byte, 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 MSOH. That is, the MST sub-module generates the MS_AIS alarm and detects the MS_RDI alarm after detecting the K2 byte, and detects the MS_REI alarm and generates the 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 AUG, divides an AUG into N AU-4s, detects the AU_LOP alarm and the 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 POH. That is, the HPT sub-module detects the HP_REI alarm after checking the B3 byte, generates the HP_TIM alarm and the HP_SLM alarm and detects the HP_RDI alarm after detecting the J1 and C2 bytes, and generates the 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 SL16A has indicators, interfaces, a bar code, a laser safety class label, and an APD alarm label.

Diagram of the Front Panel

Figure 1 shows the appearance of the front panel of the SL16A.

Figure 1 Front panel of the SL16A

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 SL16A has one optical interface. Table 1 describes the types and usage of the optical interfaces of the SL16A.

**Table 1** Optical interfaces of the SL16A
Interface	Type of Interface	Usage
IN	LC	Receives optical signals.
OUT	LC	Transmits optical signals.

Valid Slots

The SL16A must be installed in a valid slot in the subrack. Otherwise, the SL16A fails to work normally.

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 SL16A vary with the cross-connect capacity of the subrack. The slots valid for the SL16A are as follows:

When the cross-connect capacity is 200 Gbit/s, the SL16A can be installed in slots 5-8 and 11-14.

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 SL16A indicates the type of optical interface.

Table 1 describes the relationship between the feature code of the SL16A and the type of optical interface.

**Table 1** Relationship between the feature code of the SL16A and the type of optical interface
Board	Feature Code	Type of Optical Interface
SSN1SL16A01, SSN2SL16A01, SSN3SL16A01	01	I-16
SSN1SL16A02, SSN2SL16A02, SSN3SL16A02	02	S-16.1
SSN1SL16A03, SSN2SL16A03, SSN3SL16A03	03	L-16.1
SSN1SL16A04, SSN2SL16A04, SSN3SL16A04	04	L-16.2
SSN3SL16A06	06	I-16
SSN3SL16A07	07	S-16.1
SSN3SL16A08	08	L-16.1
SSN3SL16A09	09	L-16.2
SSN3SL16A10	10	U-16.2
SSN3SL16A11	11	U-16.2
SSN3SL16A14	14	S-16.1
SSN3SL16A15	15	L-16.1
SSN3SL16A13	13	I-16
SSN3SL16A16	16	L-16.2
SSN3SL16A17	17	U-16.2

Technical Specifications of the SL16A

The technical specifications of the SL16A 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 SL16A.

**Table 1** Specifications of the ports of the SL16A
Port type	Description
I-16	2 km STM-16 two-fiber bidirectional optical interfaces
S-16.1	15 km STM-16 two-fiber bidirectional optical interfaces
L-16.1	40 km STM-16 two-fiber bidirectional optical interfaces
L-16.2	80 km STM-16 two-fiber bidirectional optical interfaces
U-16.2Je (BA+PA)	170 km STM-16 two-fiber bidirectional optical interfaces NOTE: Only N3SL16A board supports U-16.2Je (BA+PA).

Table 2 list the parameters specified for the colored optical interfaces of the N3SL16A.

**Table 2** Specifications of the ports of the N3SL16A
Port type	Description
80 km CWDM	80 km CWDM STM-16 optical interfaces
120 km DWDM	120 km DWDM STM-16 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 SL16A are as follows:

Dimensions (mm): 25.4 (W) x 235.2 (D) x 261.4 (H)
Weight of the N1SL16A (kg): 0.6
Weight of the N2SL16A (kg): 1.1
Weight of the N3SL16A (kg): 0.9

Power Consumption

The maximum power consumption of the N1SL16A at room temperature (25°C) is 20 W.

The maximum power consumption of the N2SL16A at room temperature (25°C) is 20 W.

The maximum power consumption of the N3SL16A at room temperature (25°C) is 22 W.

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