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 SL4A is available in one functional version, namely, N1.
Through the board version replacement function, the N1SL4 and the N1SL4A can substitute each other.
Version Mapping
| Board | Start Version |
|---|---|
| N1SL4A | 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 SL4A is a line board. The SL4A can be used on the OptiX OSN equipment series to transmit and receive STM-4 optical signals. The SL4A converts the received optical signals into electrical signals and sends the electrical signals to the cross-connect side. In addition, the SL4A converts the electrical signals sent from the cross-connect side into optical signals and transmits the optical signals.
Functions and Features
The SL4A transmits and receives 1xSTM-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 SL4A.
| Function and Feature | SL4A |
|---|---|
| Basic functions | Receives and transmits 1xSTM-4 optical signals, and processes 1xSTM-4 standard or concatenation services. |
| 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.
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 |
|
| Service processing | Supports the VC-12 services, VC-3 services, VC-4 services, and VC-4-4c concatenation services. |
| Overhead processing |
|
| Alarms and performance events | Reports various alarms and performance events, which facilitates the management and maintenance of the equipment. |
| Protection schemes |
|
| Maintenance features |
|
Working Principle and Signal Flow
The SL4A consists of the O/E converting module, CDR module, SDH overhead processing module, logic and control module, power module.
Figure 1 shows the functional block diagram of the SL4A.
Figure 1 Functional block diagram of the SL4A
| 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 SL4A 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 SL4A.
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 SL4A has one optical interface. Table 1 describes the types and usage of the optical interfaces of the SL4A.
| Interface | Type of Interface | Usage |
|---|---|---|
| IN | LC | Receives optical signals. |
| OUT | LC | Transmits optical signals. |
The SL4A can use the swappable optical modules to facilitate maintenance.
Valid Slots
The slots valid for the SL4A 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 SL4A are as follows:
- When the cross-connect capacity is 200 Gbit/s, the SL4A can be installed in slots 1-8 and 11-17.
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 SL4A indicates the type of optical interface.
Table 1 provides the relationship between the feature code of the SL4A and the type of optical interface.
| Board | Feature Code | Type of Optical Interface |
|---|---|---|
| SSN1SL4A10 | 10 | S-4.1 |
| SSN1SL4A11 | 11 | L-4.1 |
| SSN1SL4A12 | 12 | L-4.2 |
| SSN1SL4A13 | 13 | Ve-4.2 |
| SSN1SL4A14 | 14 | I-4 |
| SSN1SL4A15 | 15 | S-4.1 |
| SSN1SL4A16 | 16 | L-4.1 |
| SSN1SL4A17 | 17 | L-4.2 |
| SSN1SL4A18 | 18 | Ve-4.2 |
| SSN1SL4A19 | 19 | I-4 |
| SSN1SL4A20 | 20 | S-4.1 |
| SSN1SL4A21 | 21 | L-4.1 |
| SSN1SL4A22 | 22 | L-4.2 |
| SSN1SL4A23 | 23 | Ve-4.2 |
Technical Specifications of the SL4A
The technical specifications of the SL4A 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 SL4A.
| 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 |
| S-4.1 | 10 km STM-4 single-fiber bidirectional optical interfaces |
| 80 km CWDM | 80 km CWDM STM-4 optical interfaces |
| 120 km DWDM | 120 km DWDM STM-4 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 SL4A 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 SL4A at room temperature (25°C) is 17 W.
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