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29

Virtual Slots of the Mother Board
Example:

30

The following number of cards can be installed in the Physical Slots or Virtual Slots of the PBX.
Note:

• Any card that exceeds the capacity of the PBX will be ignored.
• When the PBX starts up with an invalid configuration, some cards will be ignored.

The PBX supports the following number of trunks and extensions.

*1 The maximum number of extension ports is 640 per PBX, and the maximum number of Unified Messaging ports is 24 per

PBX. When24 ports for Unified Messaging are fully activated on the Master unit, the maximum number of extension ports
will be less than 640.
One Unified Messaging port is equal to 10 extension ports. Therefore, when all Unified Messaging ports are activated,
only up to 400extensions are available. This condition does not apply for Slave units.

Free Slot

1

16

SLC2/LCOT2

1

16

SLC2/BRI4
SLC2/PRI30
SLC2/PRI23

Doorphone Slot

1

16

DOORPHONE

1

16

DSP Card Slot

2

32

DSP S

2

32

DSP M
DSP L

FAX Card Slot

1

16

FAX

1

16

Storage Memory Card Slot

1

16

Storage Memory S

1

16

Storage Memory M
Storage Memory L

Virtual Trunk Card

16

16

V-IPGW16

3

6

V-SIPGW16

16

16

Virtual Extension Card

20

32

V-IPEXT32

4

32

V-SIPEXT32

20

V-UTEXT32

Virtual IP-CS Card

16

32

V-IPCS4

16

32

Total Number of Trunks

256

600

Trunk (Virtual Trunk Card)

256

256

H.323 Trunks

48

96

SIP Trunks

256

256

Trunk (Physical Trunk Card)

30

480

Total Number of Extensions

640

1000*1

Extension (Virtual Extension Card)

640

1000

IP-PT and IP Softphone

128

1000

SIP Phone

640

1000

Extension (Physical Extension Card)

2

32

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DSP cards provide digital signal processor (DSP) reference resources, and the PBX uses the resources to perform various PBX
operations. The following illustration shows the concept of DSP resource usage. More complex situations may necessitate addi-
tional resources, and in some cases fewer resources may be necessary.

The maximum number of simultaneous calls, operations and features using IP protocols is determined by the DSP card installed
in the PBX. According to the number of resources required, you can install up to 2 DSP cards.
To decide how much resources are required for the PBX, the DSP Resource Advisor can be useful.

• Calls cannot be made or received when all of the DSP resources are being used.
• The number of required resources must not exceed the DSP resources installed to the PBX.
• For details about the DSP Resource Advisor, refer to "PBX Configuration—Configuration—DSP Resource—Setting—DSP

Resource Advisor" in the PC Programming Manual.

• For information about installing DSP cards, refer to Installation Manual.

DSP resources can be reserved for certain operations to avoid lack of resources for particular operations.
When the PBXs are connected in a One-look network, you can specify how many resources to allocate to each branch.
The following examples show cases of allocating and reserving DSP resources.

For details about reserving DSP resources, refer to "DSP Resource Reservation" and "DSP Resource Advisor" in the Feature
Guide, and "PBX Configuration—Configuration—DSP—Resource—Setting—DSP Resource Advisor" in the PC Programming
Manual.

Conference

0.5

Outgoing Message

(DISA)

2

1

Music on Hold (MOH)/

External Paging (EPG)

1

Internal MOH

2

UM Tone Generator

3

Echo Canceller

Unified Messaging

1.3

PBX

Doorphone

3

1

Analogue

Trunk

2.2

G.729A

G.711

1

IP Trunk

PS

2.2

G.729A

G.711

1

IP-CS

2.2

G.729A

G.711

1

IP-PT

1

SLT

1

BRI

1

PRI

: Required DSP Resources

32

In this example, the DSP M (127 DSP resources) is installed and resources are reserved for the following operations:

• 40 VoIP (G.711) calls
• 10 Conference trunks
• 8 Unified Messaging (includes 3 Two-way recording operations)
• 10 OGM operations
• UM Tone (Fixed)

The following shows the number of each terminal equipment type supported by the PBX.

*1 KX-NT300 series and KX-NT265 (software version 2.00 or later only).

The supported card varies depending on the software version of your KX-NT265 IP-PT. To confirm the version, follow the proce-
dure below:

Reserved Resources
(40 x 1) + (10 x 0.5) + (8 x 1.3) + (10 x 2) + 2
=77.4
Free Resources
= 127 - 77.4
= 49.6

Telephone

640

1000

SLT

2

32

IP-PT*1

128

1000

SIP Phone

640

1000

IP-CS (8-channel)

64

128

PS

512

512

Doorphone

1

16

Door Opener

1

16

External Sensor

1

16