PVDM 支持数字语音连接、会议、通用转码和媒体优化服务：
● T1/E1 语音： PVDM 的主要用途之一是将数字语音打包成 IP 数据包，以启用时分复用 (TDM) 数字语音应用。
● 会议： PVDM 模块支持与 Cisco Unified Communications Manager 和 Cisco Unified Communications Manager Express 结合使用的各种编解码器的临时会议和即时会议。
● 通用转码：与 Cisco IOS ®软件结合使用时，PVDM 支持通用转码，允许从任何支持的编解码器转换为任何其他支持的编解码器。
●速率转换 ： PVDM 支持速率转换，将相同的编解码器重新打包，以连接具有不同编解码器打包周期的不同网络。
● 语音质量管理： PVDM 执行压缩、语音活动检测、抖动管理和回声消除。PVDM 中提供的回声消除具有 128 毫秒的尾部长度，并符合 ITU-T G.168。
● 节能：主板PVDM（PVDM4s）提供多种省电模式，包括不使用模块时的省电模式。在省电模式下，每个 PVDM4 最多可节省 5 瓦电力。
Catalyst 8000 和 4000 系列 ISR 的模拟语音模块（FXS、FXO 和 E/M）和基本速率接口 (BRI) 数字语音模块包含内置的、不可配置的数字信号处理器 (DSP)，不需要任何用于语音分组的附加 PVDM。
有关常见问题，请参阅PVDM 问答。
Cisco PVDM 提供三种外形尺寸，每种外形尺寸支持四种密度：
● 主板 PVDM (PVDM4)，密度高达 256 个通道（图 1）
● PVDM 增强型服务模块 (SM-X-PVDM)，密度高达 3080 个通道（图 2）
● NIM PVDM，密度高达 256 个通道（图 3）
除 ISR 4461 外，所有 Cisco 4000 系列 ISR 都支持主板 PVDM。它们可以直接插入路由器主板上的单个插槽或插入支持 T1/E1 端口的网络接口模块 (NIM)。插入主板的 PVDM4 模块仅提供基于 IP 的语音服务，例如会议、媒体优化和转码。
插入 T1/E1 NIM 的 PVDM4 模块将用于语音 T1/E1 连接。任何多余的通道都可以重新用于主板插槽支持的其他基于 IP 的服务。增强型 DSP 架构可容纳针对富媒体语音应用优化的新数据包处理引擎，同时支持 TDM-IP 语音框架。
所有包含 SM-X 插槽的 Catalyst 8300 和 ISR（即 Cisco 4331、4351、4451 和 4461 ISR）都支持 PVDM 增强型服务模块。
Catalyst 8300s 和 ISR 4461 支持 PVDM 网络接口模块，它们都包含 NIM 插槽。
SM-X 模块和 NIM PVDM 模块仅支持基于 IP 的语音服务，不能用于 TDM 应用。
Table 1. Cisco PVDM Part Numbers and Slot Requirements
|
Part Number |
Slot |
Description |
|
PVDM4-32(=) |
On-board motherboard or T1/E1 module slot |
32-channel high-density voice DSP module, or spare |
|
PVDM4-64(=) |
On-board motherboard or T1/E1 module slot |
64-channel high-density voice DSP module, or spare |
|
PVDM4-128(=) |
On-board motherboard or T1/E1 module slot |
128-channel high-density voice DSP module, or spare |
|
PVDM4-256(=) |
On-board motherboard or T1/E1 module slot |
256-channel high-density voice DSP module, or spare |
|
SM-X-PVDM-500(=) |
Enhanced services module slot |
768-channel high-density voice DSP module, or spare |
|
SM-X-PVDM-1000(=) |
Enhanced services module slot |
1024-channel high-density voice DSP module, or spare |
|
SM-X-PVDM-2000(=) |
Enhanced services module slot |
2048-channel high-density voice DSP module, or spare |
|
SM-X-PVDM-3000(=) |
Enhanced services module slot |
3080-channel high-density voice DSP module, or spare |
|
NIM-PVDM-32(=) |
Network Interface module slot |
NIM PVDM with 32-channel DSP |
|
NIM-PVDM-64(=) |
Network Interface module slot |
NIM PVDM with 64-channel DSP |
|
NIM-PVDM-128(=) |
Network Interface module slot |
NIM PVDM with 128-channel DSP |
|
NIM-PVDM-256(=) |
Network Interface module slot |
NIM PVDM with 256-channel DSP |
Table 2. Voice, Fax, and Modem Codec Support on PVDMs
|
Low-Complexity Codecs |
Complexity |
Motherboard PVDMs (PVDM4s) |
PVDM Enhanced Services Modules (SM-X-PVDMs) |
NIM PVDM Modules |
|
Clear channel |
Low |
Supported |
Not applicable |
Supported |
|
G.711 |
Low |
Supported |
Supported |
Supported |
|
Fax and modem pass-through |
Low |
Supported |
Not supported |
Supported |
|
G.722 |
Medium |
Supported |
Supported |
Supported |
|
G.726 |
Medium |
Supported |
Not supported |
Supported |
|
G.728 |
High |
Supported |
Not supported |
Supported |
|
G.729 |
High |
Supported |
Supported (mapped to G.729a) |
Supported |
|
G.729a |
Medium |
Supported |
Supported |
Supported |
|
G.729b |
High |
Supported |
Supported (mapped to G.729ab) |
Supported |
|
G.729ab |
Medium |
Supported |
Supported |
Supported |
|
Fax Relay |
Medium |
Supported |
Not supported |
Supported |
|
iLBC (Internet low bit rate codec) |
High |
Supported |
Supported |
Supported |
|
iSAC (Internet speech audio codec) |
High |
Transcoding only |
Transcoding only |
Transcoding only |
|
AMR-WB |
High |
Not supported |
Not supported |
Not supported |
|
Modem relay |
High |
Supported |
Not supported |
Supported |
Table 3. Channel Densities of PVDM4, NIM-PVDM-X and SM-X-PVDM Modules
|
Name |
Number of Channels | ||
|
Low Complexity |
Medium Complexity |
High Complexity | |
|
PVDM4-32 |
32 |
24 |
16 |
|
PVDM4-64 |
64 |
48 |
32 |
|
PVDM4-128 |
128 |
96 |
64 |
|
PVDM4-256 |
256 |
192 |
128 |
|
SM-X-PVDM-500 |
768 |
384 |
192 |
|
SM-X-PVDM-1000 |
1024 |
512 |
256 |
|
SM-X-PVDM-2000 |
2048 |
1024 |
512 |
|
SM-X-PVDM-3000 |
3080 |
1400 |
770 |
|
NIM-PVDM-32 |
32 |
24 |
16 |
|
NIM-PVDM-64 |
64 |
48 |
32 |
|
NIM-PVDM-128 |
128 |
96 |
64 |
|
NIM-PVDM-256 |
256 |
192 |
128 |
Table 4. Media-Enhancement Features
|
Feature |
Motherboard PVDMs (PVDM4s) |
PVDM Enhanced Services Modules (SM-X-PVDMs) |
NIM PVDM Modules |
|
Echo cancellation |
Yes |
No |
Yes |
|
Tone detection |
Yes |
Yes |
Yes |
|
Noise reduction |
Yes |
Yes |
Yes |
|
Acoustic shock prevention |
Yes |
Yes |
Yes |
|
Gain control |
Yes |
Yes |
Yes |
Table 5. Platform Availability for SM-X-PVDM Modules
|
4000 Series Platform |
SM-X-PVDM-500 (maximum channels) |
SM-X-PVDM-1000 (maximum channels) |
SM-X-PVDM-2000 (maximum channels) |
SM-X-PVDM-3000 (maximum channels) |
|
C8300-1N1S-6T |
1 (500) |
1 (1000) |
1 (2000) |
1 (3000) |
|
C8300-1N1S-4T2X |
1 (500) |
1 (1000) |
1 (2000) |
1 (3000) |
|
C8300-2N2S-6T |
2 (1000) |
2 (2000) |
1 (2000) |
1 (3000) |
|
C8300-2N2S-4T2X |
2 (1000) |
2 (2000) |
2 (4000) |
2 (6000) |
|
4321 |
Not supported |
Not supported |
Not supported |
Not supported |
|
4331 |
1 (500) |
1 (1000) |
Not supported |
Not supported |
|
4351 |
2 (1000) |
1 (1000) |
Not supported |
Not supported |
|
4431 |
Not supported |
Not supported |
Not supported |
Not supported |
|
4451 |
2 (1000) |
2 (2000) |
1 (2000) |
1 (3000) |
|
4461 |
3(1500) |
3 (3000) |
2 (4000) |
2 (4000) |
All SM-X-PVDM modules require minimum of 8GB RAM
Table 6. Platform Performance for Transcoding
|
Platform |
Low Complexity to Low Complexity |
|
C8300-1N1S-6T |
3336 |
|
C8300-1N1S-4T2X |
3336 |
|
C8300-2N2S-6T |
3592 |
|
C8300-2N2S-4T2X |
6672 |
|
4321 |
768 |
|
4331 |
1024 |
|
4351 |
1280 |
|
4431 |
1024 |
|
4451 |
3336 |
|
4461 |
6160 |
Table 7. Platform Performance for Conferencing
|
Platform |
Low Complexity (8-party) |
|
C8300-1N1S-6T |
498 |
|
C8300-1N1S-4T2X |
520 |
|
C8300-2N2S-6T |
591 |
|
C8300-2N2S-4T2X |
937 |
|
4321 |
130 |
|
4331 |
220 |
|
4351 |
245 |
|
4431 |
241 |
|
4451 |
502 |
|
4461 |
850 |
Note that the 4000 Series ISRs do not support the PVDM3 modules, and the 2900 and 3900 Series ISRs do not support the PVDM4, SM-X-PVDM and NIM-PVDM-X modules.
Table 8 gives the specifications for the PVDM4 and SM-X-PVDM modules.
Table 8. Module Specifications
|
Feature |
Motherboard PVDMs (PVDM4s) |
PVDM Enhanced Services Modules (SM-X-PVDMs) |
PVDM Network Interface Modules (NIM-PVDM-X) |
|
Components | |||
|
DSP |
Multicore DSP technology |
Multicore DSP technology |
Multicore DSP technology |
|
Interface |
Integrated Services Card (ISC) slot on motherboard or T1/E1 NIM |
Enhanced services module (SM-X) |
Network Interface module (NIM-PVDM-X) |
|
Features | |||
|
Operating temperature |
32° to 122°F (0° to 50°C) |
32° to 104°F (0° to 40°C) |
32° to 122°F (0° to 50°C) |
|
Voltage |
3.3V |
12V |
12V |
|
Current |
1.47A |
4.17A |
1.25A |
|
Power |
4.85W |
50W |
15W |
|
Weight |
0.08 lb (36 g) |
1.78 Ib (808 g) |
0.45lb (204 g) |
|
Dimensions (H x W x D) |
0.67 x 2.50 x 2.62 in. (1.7 x 5.1 x 6.7 cm) |
1.58 x 8.55 x 8.10 in. (4.0 x 21.7 x 20.6 cm) |
1.25 x 3.50 x 7.24 in. (3.18 x 8.89 x 18.39 cm) |
|
Regulatory and Compliance | |||
|
Safety |
Complies with: ● IEC 60950 (worldwide) ● AS/NZS 60950-1 (Australia and New Zealand) ● CAN/CSA-C22.2 No. 60950-1, 1 st and 2 nd Ed. (Canada) ● GB4943-95 (People's Republic of China) ● EN60950-1, 1 st and 2 nd Ed. (CENELEC; includes EU and EFTA) ● NOM-019-SCFI-1998 (Mexico) ● UL 60950-1, 1 st and 2 nd Ed. (United States) |
Complies with: ● IEC 60950 (worldwide) + A1 and A2 ● AS/NZS 60950-1 (Australia and New Zealand) ● CAN/CSA-C22.2 No. 60950-1, 2 nd Ed. (Canada) ● GB4943-95 (People's Republic of China) ● EN60950-1, 2 nd Ed. (CENELEC; includes EU and EFTA) plus Am1 and Am2 ● NOM-019-SCFI-1998 (Mexico) ● UL 60950-1, 2 nd Ed. (United States) |
Complies with: IEC 60950-1, 2nd Ed with all group differences and national deviations (worldwide) ● CAN/CSA-C22.2 No. 60950-1-07. (Canada) ● EN 60950-1, 2 nd Ed. (CENELEC; includes EU and EFTA) ● UL 60950-1, 2 nd Ed. (United States) ● IEC 62368, 2 nd Ed with all group differences and national deviations (worldwide) ● CAN/CSA-C22.2 No. 62368-1-14. (Canada) ● EN 62368-1, 2 nd Ed. (CENELEC; includes EU and EFTA) ● UL 62368-1, 2 nd Ed. (United States) |
|
Homologation |
Platform dependent |
Platform dependent |
Platform dependent |
|
Mean time between failures (MTBF) |
System dependent |
System dependent |
System dependent |
|
EMC | |||
|
Emissions |
● CISPR22, Class B ● EN55022, Class B, CFR47, Part 15, Subpart B, Class B |
● CISPR22, Class A ● EN55022, Class A, CFR47, Part 15, Subpart B, Class B |
● CISPR32, Class A ● EN55032, Class A, CFR47, Part 15, Subpart B, Class A |
|
Harmonics |
EN61000-3-2 |
EN61000-3-2 |
EN61000-3-2 |
|
Flicker |
EN61000-3-3 |
EN61000-3-3 |
EN61000-3-3 |
|
Immunity |
● CISPR24 ● EN 55024 ● EN50082-1 |
● CISPR24 ● EN 55024 ● EN50082-1 |
● CISPR24 ● EN 55024 ● EN61000-6-1 |
|
Electrostatic discharge (ESD) |
EN 61000-4-2 |
EN 61000-4-2 |
EN 61000-4-2 |
|
RF fields |
EN 61000-4-3 |
EN 61000-4-3 |
EN 61000-4-3 |
|
EFT |
EN 61000-4-4 |
EN 61000-4-4 |
EN 61000-4-4 |
|
Surge |
EN 61000-4-5 |
EN 61000-4-5 |
EN 61000-4-5 |
|
Conducted RF |
EN 61000-4-6 |
EN 61000-4-6 |
EN 61000-4-6 |
|
Power-frequency magnetic fields |
EN 6100-4-8 |
EN 6100-4-8 |
EN 6100-4-8 |
|
Voltage dips, sags, and interruptions |
EN 61000-4-11 |
EN 61000-4-11 |
EN 61000-4-11 |
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