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Grandmaster Clock Delivers Cutting-Edge Timing And Sync
(Mobile Development and Design Via Acquire Media NewsEdge) Every basestation and mobile network switching center needs
cutting-edge timing and synchronization. With the rollout of
Long-Term Evolution (LTE), timing requirements have become even
more important to support seamless basestation handoffs and
backhaul synchronization.
The Symmetricom TimeProvider 5000 (TP5000) carrier-grade IEEE
1588-2008 Grandmaster Clock fulfills those requirements with
additional enhancements to match the stringent frequency and phase
synchronization requirements of next-generation networks
(see the figure).
The demand for greater speeds and subsequently more bandwidth
has increased exponentially in recent years, driving the need for
increased network capacity. Voice, data, and video have converged
into an IP-based (Internet protocol) format that has also led to a
transition to Ethernet for most network connections.
Mobile operators have responded by deploying 4G/LTE networks
with support for small cells and femtocells. Backhaul channels are
also being significantly upgraded. However, these changes have
increased the emphasis on timing and synchronization. The TP5000
delivers multi-sync capabilities to support the sync requirements
of next-generation networks.
Also, the TP5000 simultaneously supports IEEE Precision Time
Protocol (PTP) 1588, Synchronous Ethernet (SyncE), T1/E1, and
Network Time Protocol (NTP). Furthermore, it adds scalable
expansion box support to support LTE frequency division duplex
(FDD) and time division duplex (TDD) synchronization requirements:
TimeProvider Expansion 10, which offers SyncE plus Precision Time
Protocol (PTP) phase profile support for LTE-TDD, and TimeProvider
Expansion 30, which provides E1 plus time of day (TOD) sync
outputs.
The solution can support up to 1000 PTP clients (ITU-T G.8265.1
Frequency Profile) and up to 10 expansion shelves with a TP5000
Grandmaster. Each TimeProvider Expansion 30 shelf adds 12 E1 and 12
1PPS/TOD ports to the configuration.
The TimeProvider Expansion 10 shelf adds 16 Ethernet ports
capable of supporting IEEE 1588 Layer 2 precision timestamps for
LTE-TDD phase synchronization requirements and SyncE physical-layer
frequency synchronization. It complies with the ITU-T G.8275.1
telecom profile delivering time and phase synchronization now in
development.
The TimeProvider 5000 Carrier-Grade NTP Synchronization Server
supports femtocell deployments. Network Time Protocol (NTP) is a
timing technology ideally suited for femtocell, Internet protocol
multimedia subsystem (IMS), Internet protocol television (IPTV),
and billing applications. The LTE rollout has brought a significant
increase in the use of femtocells to ensure sufficient coverage and
capacity to the expanded networks. More operators are adopting
femtocells to offload traffic from their regular networks.
The TimeProvider 5000 NTP Server is an independent timing
reference that enables telecommunication providers to build a more
stable and reliable network infrastructure. It can support up to
120,000 transactions per second to scale to meet capacity needs
today and in the future.
China Mobile Limited, the world’s largest mobile
telecommunications carrier, has selected the TP5000 to deploy IEEE
1588 (PTP) and SyncE for its Packet Transport Network (PTN)
deployment. The TP5000 also provides the synchronization required
for Ethernet backhaul.
SyncE provides frequency synchronization for Ethernet networks,
and PTP is the standard for providing frequency and phase
synchronization over packet networks to support 4G/LTE deployments.
The proliferation of smart phones and the growing demand for video
and data services have prompted service providers such as China
Mobile to transition from time division multiplexing (TDM) networks
to a PTN. China Mobile has chosen to deploy SyncE in the network
core and PTP over the top to basestations.
Symmetricom Inc.
© 2012 Penton Media
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