Huawei ATN 950B - Page 61

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:
l In the receive direction, this module receives and buffers the service packets from the
service access module. Then, this module schedules packets from different interfaces.
Finally, this module outputs the packets through the backplane-side interface.
l In the transmit direction, this module receives service packets from the AND1CXPA/
AND1CXPB, identifies the destination interfaces of the packets, and buffers and schedules
the packets. Finally, this module outputs the packets to the service access module.
l This module extracts and inserts IEEE 1588 V2 packets.
Management Module
This module is used with the AND1CXPA/AND1CXPB to manage and control each module on
the EM8F.
Clock Module
This module performs the following functions:
l Provides the working clock for each module on the EM8F.
l Supports the synchronous Ethernet and SSM protocols.
l Supports the IEEE 1588 V2 protocol.
l Supports the 1588 ACR clock.
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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