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Cisco Voice Modules and Interface Cards

High-Density Packet Voice Digital Signal Processor Modules

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Q & A
Q. How many versions are in PVDM2 modules?
A. PVDM2 has five versions. The product numbers for the five versions are PVDM2-8, PVDM2-16, PVDM2-32, PVDM2-48 and PVDM2-64 respectively. Each PVDM2 module includes:

PVDM2-8

8-Channel Packet Fax/Voice DSP Module

1 DSP (TI 2505)

PVDM2-16

16-Channel Packet Fax/Voice DSP Module

1 DSP (TI 2510)

PVDM2-32

32-Channel Packet Fax/Voice DSP Module

2 DSPs (TI 2510)

PVDM2-48

48-Channel Packet Fax/Voice DSP Module

3 DSPs (TI 2510)

PVDM2-64

64-Channel Packet Fax/Voice DSP Module

4 DSPs (TI2510)

Q. What does the digit number (i.e. 8, 16...) mean in the PVDM2 product number?
A. The number 8, 16, 32, 48 or 64 indicates the maximum number of G.711 voice calls that particular PVDM2 module can support.
Q. How many voice channels does each PVDM2 modules support?
A.

Name

Description1

Num. of DSPs

Max Num. of Channels in G.711

Max of Channels in High Complexity Codecs

Max Channels in Medium Complexity Codecs

PVDM2-8

8- Channel Packet Fax/Voice DSP Module

12

8

4

4

PVDM2-16

16- Channel Packet Fax/Voice DSP Module

1

16

6

8

PVDM2-32

32- Channel Packet Fax/Voice DSP Module

2

32

12

16

PVDM2-48

48- Channel Packet Fax/Voice DSP Module

3

48

18

24

PVDM2-64

64- Channel Packet Fax/Voice DSP Module

4

64

24

32

1. The number of channels in PVDM2 product numbers and descriptions is the maximum channel density with G.711 codec.
2. PVDM2-8 contains one TNETV2505GGW DSP; others PVDM2 modules contain 1 to 4 TNETV2510GGW DSPs.
Q. What are the high complexity and medium complexity codecs supported in PVDM2?
A.

 

High Complexity Codecs

Medium Complexity Codecs

PVDM2 Module

G.723.1, G.728, G.729, G.729b, GSM-EFR and Modem Relay

G.7111, g.729a, G.729ab, G.726, GSM-FR and Fax Relay

1. PVDM2 can support higher density of G.711 calls than that of other medium complexity codecs, see Table 1.
Q. Is there any tool that helps calculating the PVDM2 resources needed for a configuration?
A. Yes, Please refer to DSP Calculator in the following link: http://www.cisco.com/cgi-bin/Support/DSP/dsp-calc.pl
Q. Sometimes we read "PVDM", and other times "DSP". What are differences between these two terminologies in the context of this document and the PVDM2 data sheet?
A. PVDM stands for packet voice DSP module; it is the Cisco product name for the module that provides digital signal processing resources to a system. DSP stands for Digital Signal Processor; it is a generic Industry terminology. A PVDM module could be staffed with one or multiple DSPs.
Q. Is PVDM2 field-upgradable?
A. Yes. PVDM2 connects to the host through 80-pin SIMM interface. It can be easily plugged in, or removed.
Q. Is PVDM2 hot-swappable?
A. No.
Q. What does PVDM2 do for a VoIP application?
A. PVDM2 performs compression, voice activity detection, jitter management and echo cancellation functions to improve voice quality.
Q. Is PVDM2 and PVDM compatible? What are the differences between PVDM2 and PVDM?
A. No they are not compatible. Differences between the two products are shown in the table below:

PVDM2

PVDM

80-Pin SIMM Interface

72-Pin SIMM Interface

TI TNETV2505GGW or TNETV2510GGW

TI 549 or 542 DSP

200Mhz, 200MIPs per DSP

100Mhz, 100MIPs per DSP

8Mx16 External SDRAM per DSP

256Kx16 External SDRAM per DSP

Q. Can conferencing share the resources with transcoding or voice calls of a single DSP?
A. No. Conferencing needs a dedicated DSP resource. If a DSP is assigned for a conferencing session, then it cannot be used for transcoding or voice call initiations or terminations. Transcoding and voice calls can share the resource of a single DSP, however. Note that conferencing needs a dedicated DSP, but not a dedicated PVDM2 module. For example, PVDM2-64 contains 4 DSPs; if one of them is used for conferencing, the other three can still be used for other purposes.
Q. Which Cisco Access Routers or voice network modules support PVDM2? Which IOS releases and feature sets does PVDM2 require?
A. PVDM2 is supported in NM-HDV2, NM-HDV2-1T1/E1 and NM-HDV2-2T1/E1 starting from 12.3(7)T, in classic images IP PLUS above, and cross-platform images IP VOICE and above. NM-HDV2, NM-HDV2-1T1/E1 and NM-HDV2-2T1/E1 are supported on the Cisco 2600XM series, and Cisco 2691, 2811, 2821, 2851, 3725 and 3745 series access routers.
PVDM2 is supported in Cisco 2801, 2811, 2821, 2851 multi-service access routers, starting from 12.3(8)T4 in IP VOICE and above images; and in Cisco 3825 and 3845 multi-service access routers starting from 12.3(11)T in IP VOICE and above images.Please reference each platform's data sheet and Q&A for the maximum number of DSPs on each platform.
PVDM2 is supported in EVM-HD-8FXS/DID, EM-HAD-8FXS and EM-4BRI-NT/TE starting from 12.3(8)T4 in IP VOICE and above images.
Q. Does PVDM2 support echo cancellation?
A. Yes. PVDM2 supports echo cancellation on per channel base with 64ms tail length. The implementation is compliant to ITU-T G.168.

FOR MORE INFORMATION

For more information about the Cisco High-Density Packet Voice Digital Processing Module, visit
Text Box:  Corporate HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAwww.cisco.comTel:	408 526-4000	800 553-NETS (6387)Fax:	408 526-4100	European HeadquartersCisco Systems International BVHaarlerbergparkHaarlerbergweg 13-191101 CH AmsterdamThe Netherlandswww-europe.cisco.comTel:	31 0 20 357 1000Fax:	31 0 20 357 1100	Americas HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAwww.cisco.comTel:	408 526-7660Fax:	408 527-0883	Asia Pacific HeadquartersCisco Systems, Inc.168 Robinson Road#28-01 Capital Tower Singapore 068912www.cisco.comTel: +65 6317 7777Fax: +65 6317 7799Cisco Systems has more than 200 offices in the following countries and regions. Addresses, phone numbers, and fax numbers are listed on the Cisco Web site at www.cisco.com/go/offices.Argentina · Australia · Austria · Belgium · Brazil · Bulgaria · Canada · Chile · China PRC · Colombia · Costa Rica · Croatia · Cyprus  Czech Republic · Denmark · Dubai, UAE · Finland · France · Germany · Greece · Hong Kong SAR · Hungary · India · Indonesia · Ireland Israel · Italy · Japan · Korea · Luxembourg · Malaysia · Mexico · The Netherlands · New Zealand · Norway · Peru · Philippines · Poland Portugal · Puerto Rico · Romania · Russia · Saudi Arabia · Scotland · Singapore · Slovakia · Slovenia · South Africa · Spain · Sweden Switzerland · Taiwan · Thailand · Turkey · Ukraine · United Kingdom · United States · Venezuela · Vietnam · Zimbabwe						Copyright  2004 Cisco Systems, Inc. All rights reserved. Cisco, Cisco Systems, and the Cisco Systems logo  are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0402R) 	204064_ETMG_KW_08.04Printed in the USA Text Box:  Corporate HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAwww.cisco.comTel:	408 526-4000	800 553-NETS (6387)Fax:	408 526-4100	European HeadquartersCisco Systems International BVHaarlerbergparkHaarlerbergweg 13-191101 CH AmsterdamThe Netherlandswww-europe.cisco.comTel:	31 0 20 357 1000Fax:	31 0 20 357 1100	Americas HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAwww.cisco.comTel:	408 526-7660Fax:	408 527-0883	Asia Pacific HeadquartersCisco Systems, Inc.168 Robinson Road#28-01 Capital Tower Singapore 068912www.cisco.comTel: +65 6317 7777Fax: +65 6317 7799Cisco Systems has more than 200 offices in the following countries and regions. Addresses, phone numbers, and fax numbers are listed on the Cisco Web site at www.cisco.com/go/offices.Argentina · Australia · Austria · Belgium · Brazil · Bulgaria · Canada · Chile · China PRC · Colombia · Costa Rica · Croatia · Cyprus  Czech Republic · Denmark · Dubai, UAE · Finland · France · Germany · Greece · Hong Kong SAR · Hungary · India · Indonesia · Ireland Israel · Italy · Japan · Korea · Luxembourg · Malaysia · Mexico · The Netherlands · New Zealand · Norway · Peru · Philippines · Poland Portugal · Puerto Rico · Romania · Russia · Saudi Arabia · Scotland · Singapore · Slovakia · Slovenia · South Africa · Spain · Sweden Switzerland · Taiwan · Thailand · Turkey · Ukraine · United Kingdom · United States · Venezuela · Vietnam · Zimbabwe						Copyright  2004 Cisco Systems, Inc. All rights reserved. Cisco, Cisco Systems, and the Cisco Systems logo  are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0402R) 	204064_ETMG_KW_08.04Printed in the USA