Huawei ATN 950B - Page 46

Figure 5-1 Block diagram for the functions of the AND1EM4T
CXP
Service access
module
Clock
module
Service
processing
module
Management
module
4 x FE/GE
electrical signals
Service signals
Management bus
-48V/-60V
-48V/-60V
Power
supply
module
Back plane
Clock signals
CXP
CXP
Each module on the board
Service signals
Management bus
Management bus
Clock signals
System power
supply
System power
supply
3.0V
2.5V
3.3V
1.2V
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:
l 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. .
l 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
l This module extracts the synchronous Ethernet clock.
Service Processing Module
This module performs the following functions:
ATN 950B Multi-service Access Equipment
Hardware Description 5 Physical Interface Card
Issue 03 (2012-07-23) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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