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 SLO16 is available in the following functional versions: N1 and N4.
Table 1 describes the versions of the SLO16.
| Item | Description |
|---|---|
| Functional versions |
The SLO16 is available in the following functional versions: N1 and N4.
|
| Differences |
Interface specifications:
Others:
|
Version Mapping
| Board | Start Version |
|---|---|
| N1SLO16 | V100R009C02 |
| N4SLO16 |
V100R010C00
|
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 SLO16 is a line board. The SLO16 can be used on the OptiX OSN equipment series to transmit and receive STM-16 optical signals. The SLO16 converts the received optical signals into electrical signals and sends the electrical signals to the cross-connect side. In addition, the SLO16 converts the electrical signals sent from the cross-connect side into optical signals and transmits the optical signals.
Functions and Features
The SLO16 receives and transmits 8xSTM-16 optical signals, processes overhead bytes, and performs the MSP protection.
Table 1 provides the functions and features of the SLO16.
| Function and Feature | Description |
|---|---|
| Basic functions | Transmits and receives 8xSTM-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 N4SLO16 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 distances of 120 km.
|
| Specifications 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. |
| Overhead processing |
|
| Alarms and performance events | Reports various alarms and performance events, which facilitates the management and maintenance of the equipment. |
| Specifications of the REG | Does not support the REG. |
| Protection schemes |
|
| Maintenance features |
|
Working Principle and Signal Flow
The SLO16 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 SLO16 by describing how to process 1xSTM-16 signals.
Figure 1 Functional block diagram of the SLO16
| 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 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 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 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 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 SLO16 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 SLO16.
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.
Valid Slots
The SLO16 must be installed in a valid slot in the subrack. Otherwise, the SLO16 cannot work normally.
The SLO16 can be installed in slots 7, 8, 11, and 12 in the subrack.
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 SLO16 indicates the type of optical interface.
Table 1 provides the relationship between the feature code of the SLO16 and the type of optical interface.
Technical Specifications of the SLO16
The technical specifications of the SLO16 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 SLO16.
| 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 |
Table 2 lists the parameters specified for the optical interfaces of the N4SLO16.
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 SLO16 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 N1SLO16 at room temperature (25°C) is 38 W.
The maximum power consumption of the N4SLO16 at room temperature (25°C) is 21 W.
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