第二课 VoATM的应用实例
图5是NMS公司的VoATM典型网关结构。
为具体起见，图6给出一个960话音端口的应用方案，其中用到了三种NMS公司的设备：AG-4000c、S007和TX-3220c，图中未列出用来运行应用程序的CPU板（AG4000系列板卡不含CPU，而AG600eC包含了CPU）。
下图7给出了NMS公司ATM-DSL产品的有关参数。具体的产品资料请访问NMS公司（中国）主页或NMS公司总部。
缩略语：
CP-IWF：Customer Premise Inter-working
Function，用户侧（用户端）网络互连功能。
CO-IWF：Central Office Inter-working Function：局端（中心局）网络互连功能。
VS：Voice-band Service，话带业务。
IS：In-band Signaling，带内信令（随路信令）。
SSCS：Service Specific Convergence Sublayer，（特定）业务会聚子层。
CPS：Common Part Sublayer，公共（部分）子层。
CAS：Channel Associated Signaling，随路信令。
CCS：Common Channel Signaling，公共信道信令，即带外信令（SS7等）。
DTMF：Dual Tone Multi-frequency，双音多频。
问题
VoATM和传统话音传送的区别是什么？VoATM有什么好处？
VoATM、VoIP、VoCable、VoDSL究竟是什么关系？
如何建立一个VoATM系统？
ATM有关标准文献列表
作为异步转移模式ATM基本概念的补充这里给出与ATM有关的标准文献列表如下：
|
1
|
ITU-T E.164 (1991) |
Numbering Plan for the ISDN era |
|
2
|
ITU-T I.113 (1991) |
B-ISDN Vocabulary of Terms |
|
3
|
ITU-T I.150 (1993) |
B-ISDN Asynchronous Transfer Mode Functional Characteristics |
|
4
|
ITU-T I.211 (1993) |
B-ISDN Service Aspects |
|
5
|
ITU-T I.311 (1993) |
B-ISDN General Network Aspects |
|
6
|
ITU-T I.321 (1991) |
B-ISDN Protocol Reference Model and its Application |
|
7
|
ITU-T I.327 (1993) |
B-ISDN Functional Architecture |
|
8
|
ITU-T I.361 (1993) |
B-ISDN ATM Layer Specification |
|
9
|
ITU-T I.362 (1993) |
B-ISDN ATM Adaptation Layer (AAL) Functional Description |
|
10
|
ITU-T I.363 (1993) |
B-ISDN ATM Adaptation Layer (AAL) Specification |
|
11
|
ITU-T I.413 (1993) |
B-ISDN User-Network Interface |
|
12
|
ITU-T Q.2110 (1994) |
B-ISDN SAAL Service Specific Connection Oriented Protocol (SSCOP) |
|
13
|
ITU-T Q.2130 (1994) |
B-ISDN SAAL Service Specific Coordination Function (SSCF) at the UNI |
|
14
|
ITU-T Q.2610 (1995) |
B-ISDN Usage of Cause and Location in B-ISDN User Part and DSS2 |
|
15
|
ITU-T Q.2931 |
B-ISDN DSS2 User-Network Interface (UNI) Layer 3 Specification for Basic Call/Connection Control |
|
16
|
ITU-T Q.2951 (1995) |
Stage 3 Description for Number Identification Supplementary Services Using B-ISDN DSS2 Basic Call |
|
17
|
ITU-T Q.2957 (1995) |
B-ISDN, Stage 3 Description for Additional Information Transfer Supplementary Services Using B-ISDN DSS 2, Basic Call |
|
18
|
ITU-T Q.2961.1 |
B-ISDN DSS2 Negotiation/Modification: Additional Traffic Parameter Indications |
|
19
|
ITU-T Q.2962 |
B-ISDN DSS2 Connection Characteristics Negotiation During Call/Connection Establishment Phase |
|
20
|
ITU-T Q.2971 |
B-ISDN DSS2 UNI Layer 3 Specification for Point-to-Multipoint Call/Connection Control |
|
21
|
ATM Forum (1994) |
User-Network Interface, Version 3.1. |
|
22
|
ATM Forum (1995) |
Circuit Emulation Service Interoperability Specification 1.0 |
|
23
|
ATM Forum (1996) |
Native ATM Services: Semantic Description, Version 1.0 Specification, af-saa-0048-000. |
|
24
|
ATM Forum Private |
Network-Network Interface Specification, Version 1.0, af-pnni-0055.000 |
|
25
|
ATM Forum Traffic |
Management Specification Version 4.0 |
|
26
|
ATM Forum |
ILMI Specification Version 4.0 |
|
27
|
ATM Forum (1995) |
SAA/AMS Specification Version 1.0 |
|
28
|
ISO/IEC 6523-1984 |
Data Interchange - Structure for the identification of organizations |
|
29
|
ISO/IEC 8348 |
Information Technology - Telecommunications and Information Exchange Between Systems-Network Service Definition, 1993. |
|
30
|
IETF RFC 1629 |
Guidelines for NSAP Allocation in the Internet |
|
31
|
af-vtoa-0113.000.pdf |
ATM Forum: ATM Trunking using AAL2 forNarrowband Services |