What Packet Loss Concealment (PLC) options are available?
A4. Both Telogy proprietary PLC and G.711.1 (Appendix I) PLC are available per channel for TDM side. Q5. What are some significant differences between Texas Instruments and Mindspeed DSPs? A5. TI DSPs run much cooler and do not require per-chip heatsinks. Since DSP-based boards for VoIP applications typically employ a “DSP farm” (i.e. many DSPs) this has far-reaching effects on card density — how small the card can be, how many cards can be placed in one server and in what proximity to other cards, and of course cost of the card. Also TI DSPs are somewhat thinner and smaller, and do not require an external SDRAM device. This again impacts overall card density. A third difference worth mentioning is that TI DSPs provide carrier grade certified echo cancellation. Texas Instruments specifically purchased a high-performance echo canceller algorithm from a company called Ditech Networks for this purpose. Mindspeed has not (yet) been able to match this level of ec performance.
