IBM SG24-4817-00 Supported Virtual Connection Types, Maximum Number of Connections Supported

This soft copy for use by IBM employees only.

For the other ports:

One of the following three modes (ranges) can be selected:

•VPI/VCI: 0 bit/14 bits (VPI=0, VCI=0 through 16383)

•VPI/VCI: 4 bits/10 bits (VPI=0 through 15, VCI=0 through 1023)

•VPI/VCI: 6 bits/8 bits (VPI=0 through 63, VCI=0 through 256)

For more details refer to 3.3.4, ªControl Point V1.4º on page 31.

5.1.2 Supported Virtual Connection Types

Table 12 shows the type of virtual connections supported by the IBM 8285.

Table 12. Supported Connection Type by the A-CPSW Module

Connection Type	Supported?
Unidirectional point-to-point	No
Bidirectional point-to-point with symmetric bandwidth	Yes
Bidirectional point-to-point with asymmetric bandwidth	No ￿1￿
Unidirectional point-to-multipoint	Yes
Bidirectional point-to-multipoint	No
multipoint-to-multipoint	No

￿1￿ If a call setup request with asymmetrical bandwidth requirement is received, the 8285 will establish the call with the higher peak rate used for both directions.

5.1.3 Maximum Number of Connections Supported

The maximum number of supported connections depends on their type (point-to-point or point-to-multipoint) and for point-to-multipoint connections on

the number of parties per connection. The following are the rules you can use to determine the number of connections supported in your environment:

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The IBM 8285 has 4,096 connection control blocks.

Each point-to-point connection requires two control blocks.

Each party on a point-to-multipoint connection requires one connection control block.

•The maximum number of point-to-point connections supported by an IBM 8285 with its expansion is 2,048 regardless the expansion unit installation.

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The maximum number of point-to-multipoint trees supported is 127.

The maximum number of parties supported for all the point-to-multipoint trees is 1024.

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The maximum number of PVCs is 100.

The maximum number of point-to-point connection per media modules or base unit is 2048 with Version 1.4 (was 992).

•The maximum number of parties for point-to-multipoint connections for the base unit or per media module is 1024.

•The maximum number of point-to-point connection per 8285 port is 2048.

82ATM Workgroup Solutions: Implementing the 8285 ATM Switch