pxb4219 Infineon Technologies Corporation, pxb4219 Datasheet - Page 69
pxb4219
Manufacturer Part Number
pxb4219
Description
Iwe8 Interworking Element For 8 E1/t1 Lines
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PXB4219.pdf
(290 pages)
- Current page: 69 of 290
- Download datasheet (4Mb)
Figure 17
If the first cell has maximum negative CDV there will be “starv_ini” + 1 octets left in the
Reassembly Buffer when the following cell arrives with maximum negative CDV. In case
the following cell arrives with maximum positive CDV it will be “starv_ini” + 1 plus the
amount of data to be transmitted in the expectation interval. Just after cell arrival the
filling level of the Reassembly Buffer is at its maximum:
The delay introduced by the Reassembly Buffer is:
Structured Data Transfer:
After activation of a channel both SAR Receiver and Framer Transmit Interface start
operation. As long as no reassembled cell in P format is accepted the Reassembly Buffer
it is considered to be in underflow condition and starvation octets are passed to the
Framer Transmit Interface.
After that, “starv_ini” + 1 starvation octets are given to the Framer Transmit Interface.
Then, the transmitter reads as many octets from the Reassembly Buffer as indicated by
the pointer field. For each octet one starvation octet is given to the Framer Transmit
Interface. The next octet to be read from the Reassembly Buffer is the “ATM Start of
Structure” (The octet where the AAL1 pointer field points at).
After that, starvation octets are passed to the Framer Transmit Interface until the “Port
Start of Structure” is detected. A “Port Start of Structure” occurs when the Framer
Data Sheet
Framer
delay
4
0
Interf.
bufflsize partfill
Filling Level [octets]
Reassembly Buffer
buff_lsize
Starvation octets
Data octets
=
starvini 125 µ s
----------------------------------------- -
T
≥
0
Reassembly Buffer Initialization: Negative CDV at Start Up
N
T
×
0
+CDV
T
+
0
+CDV+T
starvini
T
T
T: Average cell distance
0
S
: First cell arrival time (theoretical)
: (starv_ini + 1) * 125µs / N
S
+ +
1
T
T
0
0
+T-CDV
∆
+T
Example: part_fill = 16 octets; N = 16
1st cell has max. neg. CDV = 15,625µs
2nd cell has max. pos. CDV = -15,625µs
=
partfill
69
+
PXB4219 / PXB4220 / PXB4221
4
×
CDV
T
×
Operational Description
0
+2*T
-------------- -
125 µ s
N
T
0
+2*T+CDV
2002-05-06
Time
Time
[6]
[7]
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