This EE-Note describes how to interface Blackfin® processors to standard T1 or E1 encoded signals. The proposed template assumes that a Blackfin processor is functionally located between two T1/E1 streams to perform the required processing, such as line echo canceling. However, the Blackfin processor can be adapted easily to other functional architectures. As shown in this EE-Note, most standard backplane PCM data streams interface directly to the processor’s serial port(s), without any external hardware. This document provides schematics, layout suggestions, and a software framework for receiving, processing, and transmitting PCM streams between two T1/E1 transceivers/ framers. The chosen framing device
This document provides a technical guide for interfacing standard T1 or E1 encoded signals to Analog Devices Blackfin processors via the Serial Port (SPORT). It details a system architecture where the processor is located between two T1/E1 streams to perform processing such as line echo canceling. The solution utilizes the PMC-Sierra PM4351 COMET framing device to extract payload data from the T1/E1 streams, allowing the processor to handle PCM data directly.
| Carrier Frequency (T1) | 1.544 MHz |
|---|---|
| Carrier Frequency (E1) | 2.048 MHz |
| Sample Rate | 125 µs |
| Framing Device | PMC-Sierra PM4351 COMET |
| Processor Model | ADSP-BF533 |
It describes how to interface Blackfin processors to standard T1 or E1 encoded signals.
The PMC-Sierra PM4351 COMET is used as the framing device.
The COMET framers generate serial inputs compliant with the SPORT's multi-channel mode from the RIN and SIN streams.