Figure 5-5 Block diagram for the functions of the AND1EM4F
CXP
Service access
module
Clock
module
Service
processing
module
Management
module
4 x FE/GE
optical signals
Service signals
Management bus
-48V/-60V
-48V/-60V
3.0V
Power
supply
module
Back plane
Clock signals
CXP
CXP
2.5V
Each module on the board
3.3V
1.2V
Service signals
Management bus
Management bus
Clock signals
System power
supply
System power
supply
Transmit Direction
The service packets from AND1CXPA/AND1CXPB are sent to the service processing module
through the backplane-side interface of the EM4F. 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, serial/parallel conversion, and E/O 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 O/E conversion, 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 O/E conversion, 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, serial/parallel conversion, and E/O
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.
46
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