cx28500 Mindspeed Technologies, cx28500 Datasheet - Page 23

• Manufacturer Part Number: cx28500
• Description: Cx28500 Multichannel Synchronous Communications Controller
• Manufacturer: Mindspeed Technologies

1.6
1.6.1
An example of a Mid-Range Router Application for channelized DS3 and unchannelized/channelized DS1 line
interface is illustrated in
Figure 1-2.
The block diagram illustrates how the CX28500 interconnects with 3 different buses:
•
•
•
•
28500-DSH-002-C
PCI bus used for communication between CX28500, central Host processor and shared memory.
EBUS used for communication with peripheral devices.
TSBUS used to provide multiple asynchronous paths between the DS3 framers and the central Host
processor. The TSBUS also provides paths for inter-processor control (IPC) channels between the DS3
framers and the central Host processor. This example illustrates how 30 of CX28500’s 32 serial ports are used
in a Mid-Range Router Application. The T3/E3 data path (payload) occupies only one TSBUS port and the
overhead path occupies another TSBUS port.
Feature List:
LEGEND:
GENERAL NOTE:
CX28333-DS3/E3 line Interface Unit.
CX29503–M13 Framers; 28 DS1 signals can be multiplexed into and demultiplexed from 1 DS3 signal or various
7xCX28380–T1/E1 Line Interface Unit.
4xCX28398 or 2xCX28395–T1/E1/Framers.
CX28500–HDLC Controller.
The application handles T1/E1 and T3/E3 signals both in North American digital telephony hierarchy and in the European
digital telephony hierarchy.
Channelized
combinations of E1 and DS1 signals that can be multiplexed into and demultiplexed from 1 DS3 signal.
T3
Mid-Range Router Application
T1
T1
T1
T1
CX28500 Applications Examples
T1/T3 WAN Access
CX28333
CX28380
LIU
EBUS
Figure
7
EBUS
DS3 Signals
T1 Signals
1-2.
Mindspeed Proprietary and Confidential
Mindspeed Technologies
CX28398
Framers
CX29503
4
Unchannelized T1)
(Channelized or
28DS1 Overhead
28DS1 Payload
T1 Signals
TSBUS
TSBUS
®
1
2
T1
T1
CX28500
0
27
PCI
B
d
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e
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i
PCI
Host
SM
Introduction
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