The SLT1 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 SLT1.
Table 1 Functions and features of the SLT1
| Function and Feature | SLT1 |
|---|
| Basic functions | Transmits and receives 12xSTM-1 optical signals. |
| Specifications of the optical interface | Supports S-1.1, L-1.1 and L-1.2 standard optical interfaces whose
characteristics comply with ITU-T G.957. |
| 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 detection of the SFP optical module, which
facilitates the maintenance of the optical module.
- Supports the single-fiber bidirectional optical module, and the
single-fiber bidirectional optical module does not support
loopbacks at the optical interface by using fiber jumpers.
|
| Service processing | Supports the VC-12 services, VC-3 services, and VC-4 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 to twelve channels of ECC communication. Port 1 to
port 8 support the ECC communication by using bytes D1-D12. Port 9
to port 12 support the ECC communication by using bytes D1-D3.
- Supports the time synchronization feature and transmission of the
time information by using the section overhead bytes.
|
| Alarms and performance events | Reports various alarms and performance events, which facilitates
the management and maintenance of the equipment. |
| Protection schemes | Supports the Two-fiber ring MSP, Four-fiber ring MSP, Linear MSP,
SNCP, SNCTP, and SNCMP. |
| Maintenance features | - Supports inloops and outloops at optical interfaces.
- 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.
- Supports the PRBS function. For details, see Availability.
- Supports the press-to-collect function in fault data collection.
|
The technical specifications of the SLT1 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 SLT1.
Table 1 Specifications of the ports
| Port type | Description |
|---|
| 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 |
| S-1.1 | 15 km STM-1 single-fiber bidirectional optical interfaces |
| L-1.1 | 40 km STM-1 single-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 SLT1 are as follows:
- Dimensions (mm): 25.4 (W) x 235.2 (D) x 261.4 (H)
- Weight (kg): 1.3
Power Consumption
The maximum power consumption of the SLT1 at room temperature
(25°C) is 22 W.
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