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NE40E-M2 V800R010C10SPC500 Configuration Guide - System Management 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - System Management
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Overview of Atom GPS

Overview of Atom GPS

Background

As the commercialization of LTE-TDD and LTE-A accelerates, there is a growing need for time synchronization on base stations. Traditionally, the GPS and PTP solutions were used on base stations to implement time synchronization.

The GPS solution requires GPS antenna to be deployed on each base station, leading to high TCO. The PTP solution requires 1588v2 support on network-wide devices, resulting in huge costs on network reconstruction for network carriers.

Furthermore, GPS antenna can properly receive data from GPS satellites only when they are placed outdoor and meet installation angle requirements. When it comes to indoor deployment, long feeders are in place to penetrate walls, and site selection requires heavy consideration due to high-demanding lightning protection. These disadvantages lead to high TCO and make GPS antenna deployment challenging on indoor devices. Another weakness is that most indoor equipment rooms are leased, which places strict requirements for coaxial cables penetrating walls and complex application procedure. For example, taking security factors into consideration, the laws and regulations in Japan specify that radio frequency (RF) cables are not allowed to be deployed in rooms by penetrating walls.

To address the preceding challenges, the Atom GPS timing system is introduced to NE40Es. Specifically, an Atom GPS module which is comparable to a lightweight BITS device is inserted to an NE40E to provide GPS access to the bearer network. Upon receipt of GPS clock signals, the Atom GPS module converts them into SyncE signals and then sends the SyncE signals to NE40Es. Upon receipt of GPS time signals, the Atom GPS module converts them into 1588v2 signals and then sends the 1588v2 signals to base stations. This mechanism greatly reduces the TCO for carriers.

Supported Interface Type

An Atom GPS module supports only GE optical interfaces and the 1000M full duplex mode. It does not support the adaptive mode.
NOTE:
After an atom GPS module is installed on an interface, the interface supports only the clock feature and does not allow the configuration of other features.

Supported PTP Device Type

The PTP device type supported by an Atom GPS module can be boundary clock (BC) or telecom boundary clock(T-BC). A BC or T-BC has multiple clock interfaces. On a BC/T-BC, one interface is used to implement time synchronization with upstream devices, and other interfaces (passive interfaces excluded) are used to transmit time information to downstream devices.

Supported Delay Measurement Mechanism

By default, an Atom GPS module supports the delay request-response mechanism, which is the PTP link delay measurement mechanism. Configuring this mechanism is not supported.

Supported Packet Encapsulation Mode

The PTP packets sent and received by an Atom GPS module are encapsulated in Layer 2 multicast mode. Therefore, the PTP packet encapsulation type of NE40E interfaces must be configured as Layer 2 multicast for proper interconnection with an Atom GPS module.

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Updated: 2019-01-02

Document ID: EDOC1100058392

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