DSP resources for Secure CFB

Answered Question
Sep 13th, 2010

I'm trying to find out the sizing rules for Secure CFB on 2851s with various PVDM2's running IOS 12.4. DSP calculator doesn't have an option for CFB and can't find it in any documentation - anyone know ?

cheers

I have this problem too.
0 votes
Correct Answer by rob.huffman about 6 years 4 months ago

Hi Alistair,

Cisco Unified Communications Manager assigns conference resources to calls on a dynamic basis. The available conference resource and the enabled codec provide the maximum number of concurrent, secure conferences allowed per router. Because transmit and receive streams are individually keyed for each participating endpoint (so no rekeying is necessary when a participant leaves the conference), the total secure conference capacity for a DSP module equals one-half the nonsecure capacity that you can configure.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/6_0_1/secugd/secuconf.html#wp1090249

Table 5     DSP Theoretical Session Capacities

Application
NM-HD-1V/2V
(1 DSP)
NM-HD-2VE
(3 DSPs)
NM-HDV2
(16 DSPs)
2801/2811
(2 PVDM2-64)
2821/2851
(3 PVDM2-64)
3825, 3845
(4 PVDM2-64)
Conferencing

G.711

8 sessions
(64 conferees)

24 sessions
(192 conferees)

50 sessions
(400 conferees)

50 sessions
(400 conferees)

50 sessions
(400 conferees)

50 sessions
(400 conferees)

G.729

2 sessions
(16 conferees)

6 sessions
(48 conferees)

32 sessions
(256 conferees)

16 sessions
(128 conferees)

24 sessions
(192 conferees)

32 sessions
(256 conferees)

Transcoding

G.711 a-law/u-law <-> G.729a/G.729ab/

8 sessions

24 sessions

128 sessions

64 sessions

96 sessions

128 sessions

G.711 a-law/u-law <-> G.729/G.729b/

6 sessions

18 sessions

96 sessions

48 sessions

72 sessions

96 sessions

Voice Termination

G.711 a-law/u-law

16 sessions

48 sessions

256 sessions

128 sessions

192 sessions

256 sessions

G.726, G.729a, G.729ab

8 sessions

24 sessions

128 sessions

64 sessions

96 sessions

128 sessions

G.729, G.729b, G.723.1, G.728

6 sessions

18 sessions

96 sessions

48 sessions

72 sessions

96 sessions

Table 6     Theoretical System Capacities for One DSP

Application
G.711 a-law/u-law
G729 a/ab
G.729, G.729b
Conferencing

8 sessions
(8 x 8 = 64 conferees)

2 sessions
(8 x 2 = 16 conferees)

2 sessions
(8 x 2 = 16 conferees)

Conferencing on PVDM2-8

4 sessions
(4 x 8 = 32 conferees)

1 session
(1 x 8 = 8 conferees)

1 session
(1 x 8 = 8 conferees)

Hardware MTP

16 sessions

Transcoding

8 sessions

8 sessions

6 sessions

http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/interop/intcnf2.html#wp1068869

Cheers!

Rob

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
Loading.
Correct Answer
rob.huffman Mon, 09/13/2010 - 11:37

Hi Alistair,

Cisco Unified Communications Manager assigns conference resources to calls on a dynamic basis. The available conference resource and the enabled codec provide the maximum number of concurrent, secure conferences allowed per router. Because transmit and receive streams are individually keyed for each participating endpoint (so no rekeying is necessary when a participant leaves the conference), the total secure conference capacity for a DSP module equals one-half the nonsecure capacity that you can configure.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/6_0_1/secugd/secuconf.html#wp1090249

Table 5     DSP Theoretical Session Capacities

Application
NM-HD-1V/2V
(1 DSP)
NM-HD-2VE
(3 DSPs)
NM-HDV2
(16 DSPs)
2801/2811
(2 PVDM2-64)
2821/2851
(3 PVDM2-64)
3825, 3845
(4 PVDM2-64)
Conferencing

G.711

8 sessions
(64 conferees)

24 sessions
(192 conferees)

50 sessions
(400 conferees)

50 sessions
(400 conferees)

50 sessions
(400 conferees)

50 sessions
(400 conferees)

G.729

2 sessions
(16 conferees)

6 sessions
(48 conferees)

32 sessions
(256 conferees)

16 sessions
(128 conferees)

24 sessions
(192 conferees)

32 sessions
(256 conferees)

Transcoding

G.711 a-law/u-law <-> G.729a/G.729ab/

8 sessions

24 sessions

128 sessions

64 sessions

96 sessions

128 sessions

G.711 a-law/u-law <-> G.729/G.729b/

6 sessions

18 sessions

96 sessions

48 sessions

72 sessions

96 sessions

Voice Termination

G.711 a-law/u-law

16 sessions

48 sessions

256 sessions

128 sessions

192 sessions

256 sessions

G.726, G.729a, G.729ab

8 sessions

24 sessions

128 sessions

64 sessions

96 sessions

128 sessions

G.729, G.729b, G.723.1, G.728

6 sessions

18 sessions

96 sessions

48 sessions

72 sessions

96 sessions

Table 6     Theoretical System Capacities for One DSP

Application
G.711 a-law/u-law
G729 a/ab
G.729, G.729b
Conferencing

8 sessions
(8 x 8 = 64 conferees)

2 sessions
(8 x 2 = 16 conferees)

2 sessions
(8 x 2 = 16 conferees)

Conferencing on PVDM2-8

4 sessions
(4 x 8 = 32 conferees)

1 session
(1 x 8 = 8 conferees)

1 session
(1 x 8 = 8 conferees)

Hardware MTP

16 sessions

Transcoding

8 sessions

8 sessions

6 sessions

http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/interop/intcnf2.html#wp1068869

Cheers!

Rob

alastair.miller Thu, 09/16/2010 - 09:01

Thanks -

I now know it depends which version of the DSP calculator you use .........

Actions

This Discussion