Contents Telektronikk - Telenor

sources. The number of such multiplexes
is obviously much larger than the number
of burst level states.
The composite cell pattern transmitted
from a multiplex of sources is denoted
the periodic cell transmission pattern
(PCTP). It is, with two modifications, the
sum of the patterns of all the sources
added together. When a source is added
the identity (e.g. VCI) of the source is
included. The modifications are:
- The start of the pattern is aligned with
the position in the PCTP which determines
the cell generated when the
source entered its current state.
- If a cell from a pattern is attempted
added into an already occupied position
in the PCTP, it is shifted ahead to
the first vacant position in the PCTP.
3
(τ) mod L
Source types Sources Composite model state space
Speech 3
On
Off
Data 1
Off
High Low
S(τ-)
Periodic cell transmission pattern (PCTP) before the state change
λ (k)
j
A B C
1 2 3
S(τ+)
1 2
PCTP after the state change
Phase difference between the generation cycles and the event time
Figure 2.12 Illustration of expansion of the global burst level state space for a very
small scenario
Cell generation pattern from source type k in state j
Figure 2.13 Example of the periodic cell transmission pattern (PCTP) immediately before and after a source changes state. Cells
from the actual source are denoted A, B, C, before and 1, 2, 3 after
Table 2.2 Example of a scenario set-up table
Source Id Fore- Source Destin. Cell Cell Load Profile
ground type tag header payload
001–100 Phone A ‘Range of ‘Name’ Jumpy
Names’
200 Y HDTV A ‘Name’ ‘Name’ Const.
300–350 File B ‘Name’ ‘Range of Step
transfer Names’
#
#
#
t
t
t
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