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PEB2055 Datasheet(PDF) 21 Page - Infineon Technologies AG

Part # PEB2055
Description  ICs for Communications Extended PCM Interface Controller
PDF  269 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

PEB2055 Datasheet(HTML) 21 Page - Infineon Technologies AG

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PEB 2055
PEF 2055
Overview
Semiconductor Group
21
1.7.1.4 Mixed D-Channel Processing, Signaling Decentralized,
Packet Data Centralized
Another possibility is a mixed architecture with centralized packet data and decentralized
signaling handling. This is a very flexible architecture which reduces the dynamic load of
central processing units by evaluating the signaling information on the line card, but does
not require resources for packet data handling. Any increase of packet data traffic does
not necessitate a change in the line card architecture, the central packet handling unit
can be expanded.
In this application IDECs are employed to handle the data on the D-channel. The IDECs
separate signaling information from data packets. The signaling messages are
transferred to the
µP, which in turn hands them over to the group controller using the
HSCX.
The packet data is processed differently. Together with the collision resolution
information it is transferred to one IOM-2 port of the EPIC. The EPIC switches the
channels to the PCM-highway, optionally combining four D-channels to one 64-kbit/s
channel. In this configuration one IOM-2 interface is occupied by IDECs, reducing the
total switching capability of the EPIC-1 to 24 ISDN-subscribers.
Figure 8
Line Card Architecture for Mixed D-Channel Processing
ITS09536
Interface
Sig.
Data
BB
BPB
C
B
...
Example Frame Structure
Signaling
S
PCM
Signaling
Highway
Highway
HSCX
Coll
+
P
p - Data
P
B, P, C
Packet
Data
Collision
Data
EPIC
R
R
IOM -2
µP
IDEC
R
IDEC
R



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