echoCancellationType
ZHONE-COM-VOICE-DSP-MIB ·
.1.3.6.1.4.1.5504.4.3.3.1.6
Object
scalar
r/w
Enumeration
This data informs which echo cancellation algorithm to
be used by default: 165 or 168 for a particular
channel. The numbers 165 and 168 are the ITU
designations for the algorithms. The number following
the designation describes the echo tail length in
milliseconds.
Both G.165 and G.168 are ITU-T recommendations. G.168
has slightly stricter technical specs. G.168 defines
much better how the tests are performed. If an echo
canceller passes the G.165 spec, then it is G.165
compliant. If it passes G.168, it is both G.168 and
G.165 compliant.
The echo tail length required depends on factors such
as network configuration, local loop length, line
frequency response, etc. Generally, 16 ms is more than
adequate for local loop (ie. Zedge) and 32 ms is a
good minimum for Network side. Our products currently
support up to 48 ms of echo tail length, MALC supports
16 ms of echo tail length.
Valid values for the variable are:
* off - echo cancellation is off (on all platforms).
* g165EchoTL16 - G.165 echo cancellation with echo
tail length of 16ms (on MALC only).
* g168EchoTL48 - G.168 echo cancellation with echo
tail length of 48ms (on the other platforms, i.e.:
BAN, Sechtor 100, Z-Edge64).
Following values are not supported:
* g165EchoTL32 - G.165 echo cancellation with echo
tail length of 32ms.
* g165EchoTL48 - G.165 echo cancellation with echo
tail length of 48ms.
* g168EchoTL32 - G.168 echo cancellation with echo
tail length of 32ms.
* g168EchoTL64 - G.168 echo cancellation with echo
tail length of 64ms.
* g168EchoTL80 - G.168 echo cancellation with echo
tail length of 80ms.
* g168EchoTL96 - G.168 echo cancellation with echo
tail length of 96ms.
* g168EchoTL112 - G.168 echo cancellation with echo
tail length of 112ms.
* g168EchoTL128 - G.168 echo cancellation with echo
tail length of 128ms.
The default value is g165EchoTL16 for MALC, and
g168EchoTL48 for the other platforms.
Context
- MIB
- ZHONE-COM-VOICE-DSP-MIB
- OID
.1.3.6.1.4.1.5504.4.3.3.1.6- Type
- scalar
- Access
- readwrite
- Status
- current
- Parent
- voiceDspDefaultConfiguration
- Siblings
- 7
Syntax
Enumeration
Values & Constraints
Enumerated Values
1 | off |
2 | g165EchoTL16 |
3 | g165EchoTL32 |
4 | g165EchoTL48 |
5 | g168EchoTL32 |
6 | g168EchoTL48 |
7 | g168EchoTL64 |
8 | g168EchoTL80 |
9 | g168EchoTL96 |
10 | g168EchoTL112 |
11 | g168EchoTL128 |
Related Objects
Sibling Objects
| Object | Type | Syntax | OID |
|---|---|---|---|
| redundancyOverSubscriptionType voice DSP redundancy over-subscription model.
It is important to know the concept of active versus
standby resources in order to understand how over-
subscription work… | scalar | Enumeration | .1.3.6.1.4.1.5504.4.3.3.1.1 |
| jitterBufferType Voice DSP channel jitter buffer defaults.
There are two types of jitter algorithms: static and
dynamic. Dynamic allows the jitter buffer to grow and
shrink as inter-ar… | scalar | Enumeration | .1.3.6.1.4.1.5504.4.3.3.1.2 |
| jitterBufferSize Voice DSP jitter buffer size in milliseconds. More
specifically, it refers to the amount of memory usage
that can store certain milliseconds of voice.
There are two typ… | scalar | milliseconds Unsigned32 | .1.3.6.1.4.1.5504.4.3.3.1.3 |
| interArrvJitThreshold The inter-arrival jitter threshold per channel used as
a trigger value in milliseconds to generate a trap
when its value is passed.
If this value is 0, the threshold mo… | scalar | milliseconds Unsigned32 | .1.3.6.1.4.1.5504.4.3.3.1.4 |
| pktsLostThreshold Voice DSP channel packets lost per minute threshold.
A trap will be generated when this value is passed.
If this value is 0, the threshold mointoring is
disabled for pa… | scalar | Unsigned32 | .1.3.6.1.4.1.5504.4.3.3.1.5 |
| silenceSuppressionType This data informs a voice DSP what type of silence
suppression algorithm to use on a channel. Silence
suppression is used to suppress packet generation during
periods of silence o… | scalar | Enumeration | .1.3.6.1.4.1.5504.4.3.3.1.7 |
| echoReturnLoss The amount of loss between the transmitted signal
and the reflected echo back from the hybrid where
the 4-to-2 wire conversion takes place.
For MALC: 0dB and 6dB. 6dB i… | scalar | Enumeration | .1.3.6.1.4.1.5504.4.3.3.1.8 |