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ZL50211 Datasheet

  • ZL50211

  • 256 Channel Voice Echo Canceller

  • 42頁

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ZL50211
256 Channel Voice Echo Canceller
Data Sheet
Features
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ZL50211 has eight Echo Voice Processors in a
single BGA package. This single device provides
256 channels of 64 msec echo cancellation or 128
channels at 128 msec echo cancellation
Each Echo Voice Processor has the capability of
cancelling echo over 32 channels
Each Echo Voice Processor (EVP) shares the
address bus and data bus with each other
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
The ZL50211 provides more than 58% board
space savings when compared with the eight Echo
Voice Processors packaged devices
Each EVP has a Patented Advanced Non-Linear
Processor with high quality subjective performance
Each EVP has protection against narrow band
signal divergence and instability in high echo
environments
Each EVP can be programmed independently in
any mode e.g. Back-to-Back or Extended Delay to
provide capability of cancelling different echo tails.
Each EVP has 0 to -12 dB level adjusters at all
signal ports (Rin, Sin, Sout and Rout)
Each EVP has the same JTAG identification code
Ordering Information
ZL50211GB 535 - Ball BGA
-40擄C to +85擄C
March 2003
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Applications
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Voice over IP network gateways
Voice over ATM, Frame Relay
T1/E1/J1 multichannel echo cancellation
Wireless base stations
Echo Canceller pools
DCME, satellite and multiplexer system
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Description
The ZL50211 Voice Echo Canceller implements a cost
effective solution for telephony voice-band echo
cancellation conforming to ITU-T G.168 requirements.
The ZL50211 architecture contains 128 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 256 channels of 64 milliseconds to 128
channels of 128 milliseconds echo cancellation or any
combination of the two configurations. The ZL50211
supports ITU-T G.165 and G.164 tone disable
requirements.
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ZL50211GB
Rin1...Rin8
Sin1....Sin8
D0....D7
CS1..CS8
A0..A12
RESET1..RESET8
EVP1
EVP2
EVP3
Rout1..Rout8
Sout1..Sout8
EVP4
EVP5
IRQ1..IRQ8
EVP6
EVP7
EVP8
DTA1..DTA8
MLCK
ODE
Fsel
R/W
C4i
Figure 1 - ZL50211 Device Overview
1
DS
Foi

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