PM7341 datasheet(92/413 Pages) PMC

92 / 413 page

PRELIMINARY

INVERSE MULTIPLEXING OVER ATM

PM7341 S/UNI-IMA-84

DATASHEET

PMC-2000223

ISSUE 4

INVERSE MULTIPLEXING OVER ATM

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

When a group is already started, IMA supports the addition of links to the group.

As illustrated by Figure 15, adding a link with a transport delay that is within the

range of the existing links does not present any problems. The DCB for the new

link must be aligned with the existing links and added to the round-robin for

playout.

Adding a link with a smaller transport delay increases the differential delay of the

group. This requires that the depth of the DCB buffer be larger than any of the

existing links. As long as the differential delay is within acceptable bounds, the

new link can be accepted. The DCB for the new link is aligned with the existing

links and added to the round-robin for playout.

Figure 16

- Snapshot of DCB Buffers after addition of Link with smaller

transport delay

DCB

Link 0

DCB

Link 1

DCB

Link 2

Write

Pointer 0

Write

Pointer 1

Write

Pointer 2

Group

Read

Pointer

DCB

Link3

Write

Pointer 3

Adding a link with a larger transport delay requires the DCB buffer depth to be

smaller than the DCB for the link with the largest delay. If the desired DCB depth

for the new link is less than 0, this means that the data for the other links has

been played out prior to the arrival of data for the new link. This is shown in

Figure 17. For the new link to be accepted, delay must be added to all other links

in the group. When delay is added to the other links in the group, the playout of

ATM cells is halted until enough delay is built up. This causes CDV for the group.

PM7341 Datasheet(PDF) 92 Page - PMC-Sierra, Inc

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