Altera's SDH/SONET Protocol Solutions
Altera provides a range of solutions for synchronous digital hierarchy (SDH) and SONET protocols. The solutions enable simple and fast protocol implementation, reducing design risk, shortening development times and allowing you to concentrate on the core functions of the system design.
By utilizing built-in transceivers to implement the protocol in a single device, Stratix® II GX FPGAs provide a fully integrated SDH/SONET solution for multi-rate applications including chip-to-chip, backplane, and line side-interfacing. Table 1 provides an overview of the Stratix II GX device SDH/SONET solution.
| Table 1. Stratix II GX FPGA Complete SDH/SONET Solution |
| Solution |
Description |
| Transceiver |
Integrated transceiver functionality:
- A1/A2 frame detection/generation
- World alignment
- Bit and byte ordering circuitry
|
| Data Rates (Per Single Channel) |
622.08 Mbps |
OC-12 |
STM-4 |
| 2.488 Gbps |
OC-48 |
STM-16 |
| Partner Cores |
Partner Intellectual Property (IP) Core Solutions |
| Development Boards |
Transceiver Signal Integrity Development Kit, Stratix II GX Edition |
| SDH/SONET Characterization Report |
Stratix GX SDH/SONET Line Side Characterization Compliance Report outlining:
- TX Jitter Tolerance
- TX Jitter Generation
- RX Jitter Tolerance
- Run Length Compliance
Available from your local Altera® sales representative
|
External Transceiver Solutions
High-density Stratix III, Stratix II FPGA or HardCopy® II structured ASIC with an external transceiver (or PHY device), can be used in applications requiring the highest density and performance.
Technology Background
SONET/SDH-based protocols are commonly used for backplane connectivity in networking systems. They allow you to reuse pre-defined standards of the SONET/SDH specifications such as framing, scrambling, and error detection. This helps reduce the overall system definition and design complexity. SONET/SDH backplanes tend to be deployed in two styles: distributed switch fabric (see Figure 1) and centralized switch fabric (see Figure 2). Centralized switch fabric relies on dedicated switch cards, while distributed switch fabric implements the switching functionality on the line card. Altera provides solutions for both implementations. Figures 1 and 2 show the difference between the two types of switch fabric.
Figure 1. Distributed Switch Fabric
Figure 2. Centralized Switch Fabric
Altera provides a complete solution for customers wishing to implement SONET/SDH over a backplane. Both Stratix II GX and Stratix GX devices offer transceivers capable of supporting data rates up to OC-48 (2.5 Gbps) using a single channel. Dedicated features—such as A1A2 pattern detectors and word aligners—are implemented within the transceiver core to reduce the amount of FPGA fabric required to support the protocol. The flexible phase-locked loop (PLL) structure ensures that all data rates can be achieved from a single clock source.
Related Links
Devices
Protocol Standard
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