PEF20550HV21XT Lantiq, PEF20550HV21XT Datasheet - Page 31

• Manufacturer Part Number: PEF20550HV21XT
• Manufacturer: Lantiq

Specifications of PEF20550HV21XT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

1.6.1.3 Decentralized D-Channel Processing, Dedicated HDLC-Controller per
In this configuration IDECs (ISDN D-channel exchange controller, PEB 2075) handle the
layer-2 functions for signaling and data packets in the D-channel. The extracted data is
separated and sent via the
configuration signaling data is transferred on the PCM-highway, for packet data a
dedicated bus system with collision resolution is used.
Figure 11
Line Card Architecture for Completely Decentralized D-Channel Processing
1.6.1.4 Decentralized D-Channel Processing, Multiplexed plus Dedicated
Especially when packet data is supported in the D-channel one multiplexed HDLC
controller may create a bottleneck situation. One solution to overcome this problem is
the combination of the multiplexing scheme with additional layer-2 controllers which can
be temporarily assigned to individual subscribers on request.
In normal operation all subscribers are managed by the D-channel arbiter and share
SACCO-A. When a subscriber requests a special type of service, the system can switch
a dedicated HDLC controller and exclude this subscriber temporarily from the arbitration.
For small systems SACCO-B, for bigger systems IDECs may be used as an assignable
controller resource.
Semiconductor Group
s + p
Data
Subscriber
HDLC-Control
IOM -2 Interface
IDEC
µP
R
R
IDEC
s-Data
p-Data
R
P and the SACCO to the system interface. In this
SACCO CH-A
SACCO CH-B
ARBITER
EPIC
ELIC
31
R
R
ITS05812
s-Data
B
B
Example Frame Structure
...
PCM
Highway
Packet Highway with
Collision Resolution
B
B
PEB 20550
PEF 20550
B
Overview
S
01.96
B