Cisco UC540W-BRI-K9 Reference Manual page 6

Unified communications 500 series model 540 for small business

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Table Of Contents

Table 8.

Feature

Support for built-in FXS ports

Support for built-in FXO ports

Support for built-in music on hold (MoH) port

Support for T1/E1 voice/WAN interface card (VWIC)

Transcoding (g711 to g729)

Conferencing**

* Total DSP resources will depend upon the number of channels provisioned in the T1.

** Conferencing always uses up an entire DSP. The rest of the features can share a DSP. The number of sessions available will

vary depending upon the codec used in a conference call.

Tables 9 and 10 list maximum sessions for either ad hoc conferencing or meet-me conferencing. DSP resources

allocated for conferencing can be shared by both features, and a mix of these can be configured. Below are a few

examples based on Table 9. The concept of sharing conferencing resources applies to Table 10 as well.

Ad hoc 24x8

Ad hoc 12x8

Ad hoc 24x4

The above examples indicate Sessions x participant.

The Transcoding column lists the maximum transcoding sessions that the system can be configured for, for a given

configuration of DSP. For example, the first row in Table 9 indicates that a maximum of three transcoding sessions

are available if three DSPs are allocated for conferencing.

If more transcoding sessions are required, DSP resources will need to be diverted from conferencing to transcoding.

For example, in the second row of Table 9, one of the DSPs is dedicated to transcoding, leaving two DSPs for

conferencing. Notice the increase in the number of transcoding sessions and the drop in the number of conferencing

sessions.

Table 9.

UC 500

Additional

SIP Trunk

Model

Voice Card

Preferred Codec

(VIC)

UC 540

None

No SIP Trunk or

G.711

G.729

Transcoding

sessions

recommended

2FXS

No SIP Trunk or

G.711

2FXS/DID

2FXO

G.729

Transcoding

sessions

recommended

4FXS

No SIP Trunk or

G.711

4FXS/DID

4FXO

G.729

2BRI NT/TE

Transcoding

DSP Resource Utilization on the Cisco UC 540

Meet-me 0x0

Meet-me 12x8

Meet-me 6x16

DSP Resources: Scenario 1

Ad-hoc

Meet-me

Conference

(Sessions x

Participants)

Up to a maximum

of 24x8 or 48x4

of 24x8 or 12x16

or 6x32

Up to a maximum

of 4x8 or 8x4

of 4x8 or 2x16 or

1x32

Up to a maximum

of 24x8 or 48x4

of 24x8 or 12x16

or 6x32

Up to a maximum

of 4x8 or 8x4

of 4x8 or 2x16 or

1x32

Up to a maximum

of 24x8 or 48x4

of 24x8 or 12x16

or 6x32

Up to a maximum

of 4x8 or 8x4

of 4x8 or 2x16 or

DSP Resource Utilization

4 channels

2 channels

24 channels*

2 channels

16 channels

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