pxb4219 Infineon Technologies Corporation, pxb4219 Datasheet - Page 66

• Manufacturer Part Number: pxb4219
• Description: Iwe8 Interworking Element For 8 E1/t1 Lines
• Manufacturer: Infineon Technologies Corporation

• In “Inactive” mode, no cells are accepted from the “UTOPIA Transmit interface”, and
• In “Standby” mode, cells are accepted from the “UTOPIA Transmit interface”, but byte-
• In “Active” mode, cells are accepted from the “UTOPIA Transmit interface”, and user
When activating the AAL reassembly channels, it is important to follow the initialization
sequence as shown in
the AAL channel. During this time the device connected to the Framer Transmit Interface
has to be in normal operation allowing the IWE8 to synchronize itself on the frame pulse.
Table 19
Step
1
2
3
4.4.2.2
Based on the cell filling level, AAL type and use of SDT, a memory block can be divided
into subblocks, where the user data octets of a single cell are stored. The size of the
memory subblock per Reassembly Buffer is automatically adapted.
relationship.
Table 20
Cell Filling
AAL0
(octets)
33–48
17–32
9–16
4–8
The physical Reassembly Buffer size used for a N x 64 kbit/s connection is given by:
Physical Size(octets) = N x 8 x Cell Filling x Cells per Block.
Data Sheet
byte-pattern 0 is sent to the framer transmit interface.
pattern 0 is sent to the framer transmit interface.
data octets are sent to the framer transmit interface.
pcfN.
p_tx_act
0 = inactive
1 = active
1 = active
Physical Reassembly Buffer Size
Size
Activation sequence for AAL reassembly channels
Relationship between Cell Filling and Reassembly Buffer Subblock
Cell Filling
AAL1, no
SDT
(octets)
32–47
16–31
8–15
4–7
Table
AAL Transmit Reference Slot.
channel_mode
00 = Inactive
00 = Inactive
01 or 11 = Active
19. Step 2 must be held at least 250 µ s to internally reset
Cell Filling
AAL1, with
SDT
(octets)
31–47
15–30
7–14
4–6
66
Octets per
block
64
64
64
64
PXB4219 / PXB4220 / PXB4221
Cells per
block
1
2
4
8
Operational Description
Minimum Time
250 µ s
Table 20
Octets per
cell
64
32
16
8
shows this
2002-05-06
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