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ITU-T Study Group 16 (Study Period 2005-2008) |
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Question 18/16 - Interaction aspects of signal processing network equipment |
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(Continuation of Question 8/15)
- Motivation
Signal Processing Network Equipment (SPNE) forms an integral part of communication networks.
Recommendations have been developed covering Circuit Multiplication, Speech Enhancement
[Network Echo Cancellers, Voice Enhancement Devices (VEDs), and Automatic Level Control], and
GSTN/IP Gateway Equipment. This Question deals with the study of interaction of SPNE, between
different SPNE, between SPNE and terminals, and between SPNE and transmission systems. Its main
purpose is to ensure the consistency of Recommendations developed by Questions 15, 16, and 17/16
in the area of SPNE, and to provide a discussion platform for interworking and interaction aspects.
The following major Recommendations, in force at the time of approval of this Question, fall under
its responsibility: G.161, Q.115.1.
- Study Items
- What interactions occur between similar and different SPNE?
- What interactions occur between voice-band signals and SPNE?
- What interactions occur between SPNE and end-terminal equipment?
- What interactions occur between SPNE and transmission systems?
- What techniques should be used to ensure high-quality SPNE Recommendations?
- What existing Recommendations need to be enhanced or new Recommendations be developed to ensure these interactions do not impair service?
- What logic is required for the control of SPNE? Such control logic may be used to switch on or off a number of different SPNE in a connection, or to configure their parameters for optimum performance?
Study items to be considered include, but are not limited to:
- The availability of general evaluation procedures;
- Interaction between similar and different SPNE;
- Interaction between SPNE and/or other voice-band traffic technologies including text telephony;
- The interaction of acoustic echo control devices with SPNE;
- Interaction between SPNE and transport systems;
- Interaction between SPNE in networks that include satellite links;
- The effect of tandem signal processing avoidance (e.g. vocoder bypass or tandem-free operation) on in-path SPNE;
- The methodology and technique to minimize the undesirable interaction of SPNE to achieve better voice quality;
- Study for SPNE used in Next Generation Networks (NGN) (SPNE interworking between GSTN and packet/IP networks);
- The evaluation of corresponding ITU-T Recommendations.
- Tasks
Tasks include, but are not limited to:
- The coordination of activities verifying the consistency of SPNE Recommendations;
- Develop guidelines on the preferred locations of SPNE in networks;
- Addressing performance issues between SPNE and other voice-band traffic types including text telephony;
- Develop draft new Recommendation(s) on control logic for SPNE;
- Maintain existing Recommendations (Q.115.1, draft Q.115.2) regarding control logic of SPNE;
- Develop draft new Recommendation(s) on a mechanism for dynamic coordination of SPNE to achieve optimal end-to-end voice quality.
An up-to-date status of work under this Question is contained in the
SG 16 Work Programme.
- Relationships
Recommendations:
- G.108.2, G.114, G.131, G.136, G.16x-Series, G.173, G.175, G.177, G.72x-Series, G.76x-Series, G.799.1/Y.1451.1, G.827, G.828, P.330, P.340, P.342, P.501, P.502, P.80, P.82, P.84, P.831, P.835, P.840, Q.50, Q.50.1, Q.50.2, S.1522, T.30, V.18, V.2x-Series, V.32, V.34, V.150.1.
Questions:
- Q.15/16, Q.16/16, Q.17/16; on network signal processing
- Q.3/16 on Media Gateway control
- Q.23(E)/16, Q.9/16 and Q.10/16 on speech coding algorithms
- Q.26(H)/16, Q.11/16 and Q.14/16 on voice-band signal compression protocols
Other Study Groups:
- ITU-T SG 2 on operational aspects of networks and performance;
- ITU-T SG 4 on network management;
- ITU-T SG 11 on signalling requirements and protocols;
- ITU-T SG 12 on speech performance;
- ITU-T SG 13 on IP-based networks, NGN and internetworking;
- ITU-T SG 15 on core network architecture, and management and control of transport systems and equipment;
- ITU-R SG 4 WP4B on voice on mixed terrestrial/satellite networks.
Other bodies:
- ETSI;
- ATM Forum;
- IETF working groups FAX on application, AVT, IPPM and IPTEL on IP transport, RMONMIB on operation and management and
SPEECHSC on service control.
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