Huawei OSN SF64 N1SF64 N4SF64 SSN1SF64 Function

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 SF64 is available in the following functional versions: N1 and N4.

Table 1 describes the versions of the SF64.

Table 1 Versions of the SF64

Item	Description
Functional versions	The SF64 is available in two functional versions, namely, N1 and N4.
Differences	Specifications of optical interfaces: DWDM colored optical interfaces. Specifications of optical modules: pluggable XFP optical modules. Maintenance features: voltage monitoring and reporting, and PRBS function.
Substitution	The N4SF64 supports the board version replacement function to substitute for the N1SF64.

Version Mapping

Board	Start Versiona
N1SF64	V100R006C01
N4SF64	V100R010C00
a: If there is replacement relationship between boards, the start version of the replaced board prevails.

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 SF64 is a line board. The SF64 can be used on the OptiX OSN equipment series to transmit and receive STM-64 optical signals. The SF64 can achieve ultra-long distance transmission when working with the BPA and DCU board.

Figure 1 Networking and application of the SDH line board

The SF64 can be interconnected with the wavelength division multiplexing (WDM) equipment.

Functions and Features

The SF64 receives and transmits 1xSTM-64 optical signals and processes overhead bytes.

Table 1 describes the functions and features of the SF64.

Table 1 Functions and features of the SF64

Function and Feature	Description
Basic functions	Transmits and receives 1xSTM-64 optical signals. Supports the enabling or disabling of the FEC function.
Specifications of the optical interface	Supports different types of standard optical interfaces, namely, the Ue-64.2c, Ue-64.2d, and Ue-64.2e. The characteristics of the optical interfaces comply with the standards defined by Huawei. Supports the output of the standard wavelengths that comply with ITU-T G.692 and can be directly connected to the DWDM equipment. The N1SF64/N4SF64 supports the DWDM colored optical interfaces. The optical interface uses the LC connector. The DWDM optical interface supports the transmission distance of 40 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. The N4SF64 supports the usage and detection of the XFP optical module, therefore facilitating maintenance 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, VC-4-16c concatenation services, and VC-4-64c concatenation services.
Overhead processing	Processes the section overheads of the STM-64 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.
Specifications of the REG	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 and the FEC 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 SF64 supports a maximum of two MSP 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. The N4SF64 supports detection and query of the voltage. Supports the PRBS function. For details, see Availability. Hot board swapping.

Working Principle and Signal Flow

The SF64 consists of the O/E converting module, MUX/DEMUX module, FEC module, SDH overhead processing module, logic and control module, and power module.

Figure 1 shows the functional block diagram of the SF64.

Figure 1 Functional block diagram of the SF64

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 FEC module into high rate electrical signals.

FEC Module

• In the upstream direction, the reverse process is performed. The FEC encoding and decoding module receives the 16 x 669 Mbit/s signals from the DEMUX module. After frame searching, FEC encoding, data packets encapsulation, and scrambling in the FEC module, the 16 x 622 Mbit/s signals are recovered and then transmitted to the SDH overhead processing module. The frame format of the 16 x 669 Mbit/s signals complies with ITU G.709.
• In the downstream direction, the FEC encoding and decoding module receives 16 x 622 Mbit/s signals, which are sent by the SDH overhead processing module. After frame searching, FEC encoding, data packet encapsulation, and scrambling, the 16 x 622 Mbit/s signals are converted into 16 x 669 Mbit/s signals and then transmitted to the MUX module.
• The FEC processing module is connected to the logic and control module through a CPU bus. The CPU controls the working modes of the FEC module by configuring the internal register. The working mode can be the regenerator mode, namely, REG mode. The CPU can monitor the performance through the internal register.

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 multiplex section overhead (MSOH). That is, the MST sub-module detects K2 bytes, and upon errors, generates MS_AIS or MS_RDI alarms; it also verifies B2 bytes, and upon errors, generates B2_SD or B2_EXC alarms and sends MS_REI signals to its opposite end.
  • 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 path overhead (POH). That is, the HPT sub-module verifies B3 bytes, and upon errors, sends HP_REI signals to its opposite end; it also detects J1 and C2 bytes, and upon errors, generates HP_TIM, HP_SLM, or HP_UNEQ (if VC-4 paths are unloaded) alarms.
  • 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 SF64 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 N1SF64.

Figure 1 Front panel of the N1SF64

Figure 2 shows the appearance of the front panel of the N4SF64.

Figure 2 Front panel of the N4SF64

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 SF64 has one optical interface. Table 1 describes the types and usage of the optical interfaces of the SF64.

Table 1 Optical interfaces of the SF64

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

Valid Slots

The SF64 must be installed in a valid slot in the subrack. Otherwise, the SF64 fails to work normally.

The slots valid for the SF64 are as follows:

• The N1SF64 can be installed in slots 7, 8, 11, and 12.
• The N4SF64 can be installed in slots 5-6, 7-8, 11-12, and 13-14.

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 SF64 indicates the type of optical interface.

Table 1 provides the relationship between the feature code of the SF64 and the type of optical interface.

Table 1 Relationship between the feature code of the SF64 and the type of optical interface

Board	Feature Code	Type of Optical Interface
SSN1SF6400, SSN4SF6400	00	Fixed-wavelength optical interface
SSN1SF6401, SSN4SF6401	01	Ue-64.2c, Ue-64.2d, and Ue-64.2e

Technical Specifications of the SF64

The technical specifications of the SF64 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 SF64, Specifications of the colored optical interfaces comply with the ITU-T G.692.

Table 1 Specifications of the ports

Port type	Description
Ue-64.2c	Ue-64.2c two-fiber bidirectional optical interfaces
Ue-64.2d	Ue-64.2d two-fiber bidirectional optical interfaces
Ue-64.2e	Ue-64.2e two-fiber bidirectional optical interfaces
40 km DWDM	40 km DWDM STM-64 optical interfaces (FEC)

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 SF64 are as follows:

• Dimensions (mm): 25.4 (W) x 220 (D) x 254.1 (H)
• Weight of the N1SF64 (kg): 1.1
• Weight of the N4SF64 (kg): 1.2

Power Consumption

• At room temperature (25°C), the maximum power consumption of the N1SF64 is 33 W.
• At room temperature (25°C), the maximum power consumption of the N4SF64 is 26 W.

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