Huawei ATN 950B Hardware Description page 46

ATN 950B Multi-service Access Equipment
Hardware Description
Figure 5-1 Block diagram for the functions of the AND1EM4T
electrical signals
Transmit Direction
The service packets from AND1CXPA/AND1CXPB are sent to the service processing module
through the backplane-side interface of the AND1EM4T. The service processing module
identifies the destination interfaces for the packets, and buffers and schedules the packets. Then,
the service processing module sends the processed packets to the service access module, where
coding/decoding and serial/parallel conversion are performed. Finally, the service access module
outputs the packets through the GE/FE interfaces on the front panel.
Receive Direction
The GE/FE interfaces on the front panel receive GE/FE service signals. Then, the service access
module performs serial/parallel conversion and coding/decoding on the services, and then sends
the services to the service processing module. The service processing module buffers the service
packets, schedules the packets, and finally outputs the packets through the backplane-side
interface.
Service Access Module
This module performs the following functions:
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Service Processing Module
This module performs the following functions:
Issue 03 (2012-07-23)
4 x FE/GE
Service access
module
Management bus
Management
module
Each module on the board
In the receive direction, this module receives the GE/FE services from the interfaces on the
front panel, performs serial/parallel conversion and coding/decoding, and then sends the
services to the service processing module. .
In the transmit direction, this module receives the service packets from the service
processing module, performs coding/decoding, and serial/parallel conversion on the
packets, and then outputs the packets through the GE/FE interfaces on the front panel
This module extracts the synchronous Ethernet clock.
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Service
Service signals
processing
module
Management bus
Clock
module
Management bus
3.3V
Power
3.0V
supply
2.5V
module
1.2V
5 Physical Interface Card
Back plane
Service signals
Clock signals
Clock signals
System power
-48V/-60V
System power
-48V/-60V
CXP
CXP
CXP
supply
supply
37