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參數(shù)資料
| 型號(hào)： | TECO3264 |
| 廠商： | Lineage Power |
| 英文描述： | 32-Channel Echo Canceller(32通道回波清除器) |
| 中文描述： | 32通道回聲消除器（32通道回波清除器） |
| 文件頁數(shù)： | 48/128頁 |
| 文件大?。?/td> | 2328K |
| 代理商： | TECO3264 |
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Data Sheet
August 1999
TECO3264 32-Channel Echo Canceller
48
Lucent Technologies Inc.
Register Architecture
Register Scopes
The TECO3264’s programmable parameters and options have two scopes:
1.
Those that may be set independently for each channel. These are referred to as
per-channel
functions. For
example, enabling and disabling bypass modes are set on a per-channel basis. Per-channel functions are
groups of 32 single-bit functions, with one for each channel.
Those that affect the operation of all channels. Examples are gains, speech detector thresholds, and selection
of μ-law or A-law coding.
2.
There are 186 functions in the read-write page 0 registers. Only very few will be of concern in final fine tuning to
unusual conditions in a given network. The great majority of these functions will be set once for given system
design options and for normal network characteristics.
There are 28 functions in the read-only page 1 registers, 100 through 10E. These are used for status and alarm
conditions.
The first 32 Page 0 registers, 000 through 01F, allow for per-channel control of functions for individual DS0 chan-
nels of the echo canceller. Each channel has its 8-bit byte (including two unused bits). Each bit represents a binary
function for that channel. Examples include enabling/disabling the echo canceller function, nonlinear processor, H-
register freeze control, and call boundary.
Note:
The terms time slots and channels are both used in TECO3264 documents to refer to bidirectional
64 kbits/s DS0 channels for one customer circuit. Channel is used in connection with echo canceller pro-
cessing functions. Time slot is used when timing relationships among the bits, sync pulses, and clocks are
the subject.
Page 0 registers, 020 through 01F, are
all channel
, and allow provisioning of functions for all 32 channels at once.
(The term digroup is sometimes used to mean all 32 channels even though it derives from the North American
1.544 Mbits/s DS1 24-channel systems where group refers to 12 channels and digroup refers to two groups or 24
DS0 channels.) For DS1 applications, 24 of the available channels are used and eight are unused and stuffed with
dummy bit values. E1 applications tend to use A-law coding while DS1 applications tend to use μ-law coding. (Most
applications use inverted μ-law or A-law rather than the normal versions.) Thus, E1 and T1 systems will require dif-
ferent settings of the X, Y, C, and E port PCM register settings. If the TECO3264 is used at the boundaries of A-law
and μ-law coded networks, the PCM ports must be set appropriately.
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