ZL38065

• Independent multiple channels of echo cancellation; from 32 channels of 64 ms to 16 channels of 128 ms with the ability to mix channels at 128 ms or 64 ms in any combination
• Fully compliant to ITU-T G.165, G.168 (2000) and (2002) specifications
• Passed all AT&T voice quality tests for carrier grade echo canceller systems.
• Unparalleled in-system tunability
• Sub 50 ms initial convergence times under many typical network conditions
• Fast reconvergence on echo path changes
• Patented Advanced Non-Linear Processor with high quality subjective performance
• Superior noise matching algorithm
• PCM coding, /A-Law ITU-T G.711 or sign magnitude
• Per channel Fax/Modem G.164 2100 Hz or G.165 2100 Hz phase reversal Tone Disable
• Per channel echo canceller parameters control
• Transparent data transfer and mute
• Protection against narrow band signal divergence and instability in high echo environments
• +9 dB to -12 dB level adjusters (3 dB steps) at all signal ports
• Offset nulling of all PCM channels
• Independent Power Down mode for each group of 2 channels for power management
• Compatible to ST-BUS and GCI interface at 2 Mbps serial PCM
• 3.3 V pads and 1.8 V Logic core operation with 5 V tolerant inputs
• IEEE-1149.1 (JTAG) Test Access Port

The ZL38065 Voice Echo Canceller implements a cost effective solution for telephony voice-band echo cancellation conforming to ITU-T G.168 requirements. The ZL38065 architecture contains 16 groups of two echo cancellers (ECA and ECB) which can be configured to provide two channels of 64 milliseconds or one channel of 128 milliseconds echo cancellation. This provides 32 channels of 64 milliseconds to 16 channels of 128 milliseconds echo cancellation or any combination of the two configurations. The ZL38065 supports ITU-T G.165 and G.164 tone disable requirements.