Michael Ritter discusses the inclusion of an IEEE 1588v2 mini-Grandmaster clock on the ADVA FSP 150 family of mobile backhaul products and its impact on LTE-Advanced radio access networks.

1. Dr. Michael Ritter
June 18, 2013
The Need for an
Access Grandmaster

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LTE-Advanced Is On Its Way
Accurate phase synchronization of base station clocks becomes mandatory
• Small cells enable more efficient
spectrum utilization
• Time Division Duplex (TDD) mode
provides more flexibility
• Inter-cell interference coordination
increases user experience
• Coordinated multipoint transmission
for more capacity at cell edges
Downlink
Uplink

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G.8275.1 Synchronization Model
Major CAPEX to upgrade networks forces operators to look for alternatives
• Timing support from the backhaul network is required to meet the
stringent requirements
• G.8275.1 Telecom Profile mandates full on-path support
• On path-support may require hardware swap or a completely new
network installation
PTP
T-BCGM T-BC T-BC
PTP PTP PTP

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Alternative Synchronization Model
Investment protection by leveraging legacy backhaul network resources
• Distributed grandmaster architecture with deployment near or at
the cell site
• Ideal for macro and small cell deployment as well as last mile
aggregation in FDD and TDD networks
• Fallback to G.8265.1/G.8275.2 boundary clock for increased reliability
PTP
GM Access GM
PTP PTP
CLOCK ANALYSIS
Clock recovery Score
Phase recovery Score
PTP-clock-probe1-1
TS1-1
PTP-clock-probe1-2
PTP-clock-probe1-4
Legacy
Backhaul Network

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Syncjack™ Benefits
Syncjack™ enables SLA-based sync delivery in wholesale applications
• SyncE and 1588v2 functionality integrated into
all FSP 150 Carrier Ethernet devices
• Industry-leading frequency and time recovery
for slave, transparent and boundary clock
• High quality oscillator and multiple clock domains
• Clock accuracy assurance and in-service
verification across the entire backhaul network
• Comprehensive tools for clock accuracy
measurement, clock analysis and PTP network analysis

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Mobile Backhaul Solution Overview
Access & Demarcation Last Mile Aggregation Metro
FSP 150CC-XG210 FSP 150EG-X FSP 150EG-X
FSP 150CC-GE206
FSP 150CC-GE206
FSP 150CC-GE114SH
FSP 150CC-GE114S
• Service OAM
termination
• SONET/SDH service
termination
• Large aggregation
sites
• Small and medium cell sites
• E1/T1 backhaul
• Sync service delivery
• Cell tower hubs
• Small and medium
aggregation sites
FSP 150SP-100

7. mritter@advaoptical.com
Thank You
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