The SL1 transmits and receives STM-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 SL1.
Table 1 Functions and features of the SL1
| Function and Feature | SL1 |
| Basic functions | Transmits and receives 1xSTM-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 .
|
| Specifications of the optical module | - Supports the detection and query of the information about the optical module.
- Supports the usage and detection of the small form-factor pluggable (SFP) optical module, which facilitates the maintenance of the optical module.
- Provides the automatic laser shutdown (ALS) function. The optical interface supports the setting of the on/off state of a laser.
|
| Service processing | - Supports the VC-12 services, VC-3 services, and VC-4 services.
- The N2SL1 supports the AU-3 services.
|
| Overhead processing | - Processes the section overheads of the STM-1 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 | Provides various alarms and performance events, which facilitates the management and maintenance of the equipment. |
| Protection schemes | - Supports the Two-fiber ring MSP, only supports two-fiber unidirectional MSP ring.
- Supports the Four-fiber ring MSP.
- Supports the Linear MSP.
- Supports the SNCP.
- Supports the SNCMP.
- Supports the SNCTP.
|
| Maintenance features | - Supports inloops and outloops at optical interfaces.
- The N1SL1 supports inloops 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 N2SL1 supports the TCM function.
- Supports the press-to-collect function in fault data collection.
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The technical specifications of the SL1 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 SL1.
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 N1SL1 and N2SL1 are as follows:
- Dimensions (mm): 25.4 (W) x 235.2 (D) x 261.4 (H)
- Weight of the N1SL1 (kg): 0.6
- Weight of the N2SL1 (kg): 1.0
Power Consumption
The maximum power consumption of the N1SL1 at room temperature (25°C) is 17 W.
The maximum power consumption of the N2SL1 at room temperature (25°C) is 14 W.
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