DAB+ Workshop
DAB Network Architectures and Equipment
Dr. Les Sabel
ITU Consultant
16 December 2014
DAB+ Workshop
Overview
DAB+ Network Structures
Redundancy
Proposed Network Architectures
Ancillary Equipment
Next Steps
DAB+ Workshop
DAB+ Network Structures
DAB+ Workshop
DAB+ Network Structures
Encoders at Studio site 1
Transmitter site 1
Central Multiplexer Site
Contribution Network
Ensemble Multiplexer
Distribution Network
Transmitter site M
Encoders at Studio site N
DAB+ Workshop
DAB+ Network Structures
Nested Star network
Repeater Transmitter Site
1‐1
Local Multiplexer and Transmitter Site 1



National CMS
Bangkok
Local Multiplexer and Transmitter Site N
Repeater Transmitter Site
1‐M
Repeater Transmitter Site
N‐1
Repeater Transmitter Site
N‐M
DAB+ Workshop
DAB+ Network Structures
Full system
Repeater transmitter sites in Local Area
Local Multiplexer and Transmitter Site
National Multiplexer Site (BKK)
Main transmitter (BKK)
VPN
VPN
DAB+ Workshop
DAB+ Network Structures
Trial system
Chiang Mai
4 Trial transmitter sites
National Multiplexer Site (BKK)
Khon Kaen
Main transmitter (BKK)
VPN
Nakhon Si Thammarat
Multiple studio sites in Bangkok
Songkhla
DAB+ Workshop
DAB+ Network Structures
Data flow - content
Ensemble Provider capacity controller
Service Provider capacity controller
AES Playout
audio
and scheduling systems
DAB+ audio encoders
PAD Server
Control information
Ensemble Multiplexer
VPN
RF
Combiner
VPN
Audio content information
Transmitter
Data Multiplexer
Multimedia content information
Exciter
Complete ensemble information
DAB+ Workshop
DAB+ Network Structures – Capacity control
Total Capacity = 1152kbps (FEC = EEP3A)
Ensemble 1
Ensemble capacity controller
Network 1 allocation, e.g. 128kbps
Station A
Sub‐Channel 0
64kbps
Station B
…
Network N allocation, e.g. 192kbps
Station X Station Y
Station Z
Sub‐Channel 1
M
M+1
M+2
64kbps
32kbps
64kbps
96kbps
Service provider capacity controller
DAB+ Workshop
DAB+ Network Structures
Data flow - monitoring
Ensemble Provider capacity controller
Service Provider capacity controller
Playout
and scheduling systems
AES audio
DAB+ audio encoders
Control information
VPN
Ensemble Multiplexer
RF
Combiner
VPN
Transmitter
Audio content information
Exciter
PAD Server
C
Service Monitor
Data Multiplexer
ETI / EDI Monitor
ETI / EDI Monitor
C
Network Management System
Complete ensemble information
Transmitter Monitor
DAB+ Workshop
DAB+ Network Structures
preferred satellite solution
Transmitter site N
3 x 1.5Mbps outbound per ensemble
IP over DVB‐S2
Transmitter site 3
TDMA aggregated return traffic 512kbps
Return traffic 512kbps peak
Central multiplexer site
Transmitter site 2
Transmitter site 1
DAB+ Workshop
DAB+ Network Structures
Architectures are proposed for the three main site types
• Studio Site
• Central Multiplexing Site (CMS)
• Transmitter Site
The architecture for each site type is reused at all sites with
minimal variations
The contribution and distribution networks will generally be very
similar with only slight variations in both contribution and
distribution based on local conditions
DAB+ Workshop
Redundancy
DAB+ Workshop
Redundancy
Purpose
• Minimise service interruptions
• Equipment failures
• Equipment servicing and maintenance
Cost Benefit
• Increases as the listening population increases
• Redundancy can be added in stages to spread Capex over time
• Need a minimum amount to counter potential long periods of outage
Types
• None
• N+1
• 1+1
DAB+ Workshop
Redundancy
Equipment options
• Studio
• Encoders
• Service Controller
• Studio to EMUX link
• PAD Server
• Multiplexer Sites
• Ensemble Multiplexer
• Ensemble Controller
• Data Multiplexer
• NTP server
• NMS
Audio Service Interruption
Failure
Maintenance
None N+1
1+1
None N+1
Y
Y
N
Y
N
N
N
N
N
N
Y
N
Y
N
N
N
N
N
1+1
N
N
N
N
Y
N
N
Y
N
N
N
N
N
N
N
N
N
N
N
N
N
N
Y
N
N
Y
N
N
N
N
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Redundancy
Equipment options
• Transmitter site
• Distribution Links
• Transmitters
• Exciter
• PA
• Combiner
• Antenna system
• Monitors
Audio Service Interruption
Failure
Maintenance
None N+1
1+1
None N+1
Y
Y
N
Y
N
1+1
N
Y
Y
Y
Y
N
N
N
N
N
Y
N
N
N
N
N
Y
Y
Y
Y
N
N
N
DAB+ Workshop
Redundancy Proposal – Trial System
Use an N+1 approach on a site basis where possible
• Avoids long outages
• Minimum cost impact
Full System variations
• Some service interruptions are possible
•
•
•
•
Encoders
Service and Ensemble Controllers
Transmitters
Monitors
To minimise service interruptions
• EMUX = 1+1
• Satellite transceivers = 1+1
• Transmitter exciters = 1+1
• Antenna = 1+1 split system
Encoders => 1+1
Microwave distribution
links transceivers = 1+1
DAB+ Workshop
Proposed Network Architectures – Studio Sites
Full System
Service Provider capacity controller
Playout and scheduling systems
AES audio
Control information
IP switch, router and firewall
DAB+ audio DAB+ audio encoders
encoders
IP
IP outputs
Cloud access point A
Telco VPN
DAB+ audio Redundant DAB+ encoders
audio encoders
IP switch, router and firewall
PAD Server
Multimedia content and audio metadata
Formatted PAD
Cloud access point B
DAB+ Workshop
Proposed Network Architectures – Studio Sites
Trial System
Control information
Service Provider capacity controller
Playout and scheduling systems
AES audio
DAB+ audio DAB+ audio encoders
encoders
IP output
IP
IP switch, router and firewall
PAD Server
Multimedia content and audio metadata
Formatted PAD
Redundant DAB+ audio encoder(s)
Telco VPN
DAB+ Workshop
Proposed Network Architectures – National Multiplexing Site
Full System
4 redundant EMUX pairs
Contribution network feeds
EDIM monitors all 4 ensembles
Quad EDI Monitor
EMUX controller
EMUX controller
EMUX controller
EMUX controller
Ensemble and data Ensemble and data Ensemble and data multiplexer multiplexer Ensemble and data multiplexer (main)
(main)
multiplexer A
(main)
EDI SW
EDI SW
EDI SW EDI SW
A
Telco VPN
Distribution satellite transceiver (main)
Redundancy switching link
Ensemble and data Ensemble and data Ensemble and data multiplexer
multiplexer
Ensemble and data multiplexer
(backup)
(backup)
multiplexer B
(backup)
EDI SW
EDI SW
EDI SW EDI SW
B
Distribution satellite transceiver (backup)
Quad EDI Monitor
IP switch, router and firewall
GPS / NTP server
NMS, MSTS
Other support equipment
DAB+ Workshop
Proposed Network Architectures
Full System – LMTS
Quad EDI Monitor
4 redundant EMUX pairs
Contribution network feeds
Quad EDI Monitor
Tx
EMUX controller
EMUX controller
EMUX controller
EMUX controller
Ensemble and data Ensemble and data Ensemble and data multiplexer multiplexer Ensemble and data multiplexer (main)
(main)
multiplexer A
(main)
National Distribution satellite transceiver (main)
B
EDI SW
EDI SW
EDI SW EDI SW
A
A
IP SW A
Telco VPN
Local Area microwave link (main)
Redundancy switching link
Ensemble and data Ensemble and data Ensemble and data multiplexer
multiplexer
Ensemble and data multiplexer
(backup)
(backup)
multiplexer B
(backup)
EDIM monitors all 4 local ensembles
EDI SW
EDI SW
EDI SW EDI SW
B
IP SW A
Quad EDI Monitor
EDIM monitors all 4 national ensembles
Quad EDI Monitor
Local Area microwave link (backup)
National Distribution satellite transceiver (main)
DAB+ Workshop
Proposed Network Architectures
Full System – LMTS data flow
Quad EDI Monitor
4 redundant EMUX pairs
Contribution network feeds
Quad EDI Monitor
Tx
EMUX controller
EMUX controller
EMUX controller
EMUX controller
Ensemble and data Ensemble and data Ensemble and data multiplexer multiplexer Ensemble and data multiplexer (main)
(main)
multiplexer A
(main)
National Distribution satellite transceiver (main)
B
EDI SW
EDI SW
EDI SW EDI SW
A
A
IP SW A
Telco VPN
Local Area microwave link (main)
Redundancy switching link
Ensemble and data Ensemble and data Ensemble and data multiplexer
multiplexer
Ensemble and data multiplexer
(backup)
(backup)
multiplexer B
(backup)
EDIM monitors all 4 local ensembles
EDI SW
EDI SW
EDI SW EDI SW
B
IP SW A
Quad EDI Monitor
EDIM monitors all 4 national ensembles
Quad EDI Monitor
Local Area microwave link (backup)
National Distribution satellite transceiver (main)
DAB+ Workshop
Proposed Network Architectures – National Multiplexing Site
Trial System
3 redundant EMUX pairs
Contribution network feeds
Single transceivers for links NOT RECOMMENDED
EDIM monitors all 3 ensembles
Triple EDI Monitor
EMUX controller
EMUX controller
EMUX controller
Ensemble and data Ensemble and data multiplexer Ensemble and data multiplexer (main)
multiplexer A
(main)
EDI SW
EDI SW EDI SW
A
Telco VPN
Distribution satellite transceiver (main)
Redundancy switching link
Ensemble and data Ensemble and data multiplexer
Ensemble and data multiplexer
(backup)
multiplexer B
(backup)
EDI SW
EDI SW EDI SW
B
Distribution satellite transceiver (backup)
Triple EDI Monitor
N+1 EMUX redundancy NOT RECOMMENDED
IP switch, router and firewall
GPS / NTP server
NMS, MSTS
Other support equipment
DAB+ Workshop
MSTS
GPS / NTP Server A
National Multiplexing Site HW connectivity
IP router, firewall A
Distribution Satellite TRX (main)
EDI SW A
EDI SW A
EDI SW A
EDI SW A
IP switch A
Quad EDIM A
EMUX controller
EMUX controller
EMUX controller
EMUX controller
Ensemble and data Ensemble and data EMUX A
multiplexer A
EMUX A
multiplexer A
NMS
Contribution Network(s)
GPS / NTP Server B
Distribution Satellite TRX (stdby)
IP router, firewall B
EDI SW A
EDI SW A
EDI SW A
EDI SW B
IP switch B
Quad EDIM B
EMUX controller
EMUX controller
EMUX controller
EMUX controller
Ensemble and data Ensemble and data EMUX A
multiplexer A
EMUX B
multiplexer A
DAB+ Workshop
EMUX controller
EMUX controller
EMUX controller
EMUX controller
Ensemble and data Ensemble and data EMUX A
multiplexer A
EMUX A
multiplexer A
LMTS HW connectivity
MSTS
EDI SW A
EDI SW A
EDI SW A
EDI SW A
GPS / NTP Server A
Quad EDIM A
IP router, firewall A
IP switch A
Distribution Satellite TRX (main)
LA Microwave links LA Microwave links (main)
(main)
A
Contribution Network(s)
Tx
B
IP router, firewall B
IP switch B
Quad EDIM B
GPS / NTP Server B
NMS
LA Microwave links LA Microwave links (stdby)
(stdby)
Distribution Satellite TRX (stdby)
EDI SW A
EDI SW A
EDI SW A
EDI SW B
EMUX controller
EMUX controller
EMUX controller
EMUX controller
Ensemble and data Ensemble and data EMUX A
multiplexer A
EMUX B
multiplexer A
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Proposed Network Architectures
Local Area Distribution Network Options
DAB+ Workshop
Proposed Network Architectures – Repeater Transmitter Sites
Full System
8 x EDI monitor
Microwave link transceiver
EDI over IP & inter Tx communications
RF
Spare Transmitter
IP Router / Switch
IP Router / Switch
Transmitter 1
RF switch



Load
Transmitter 8
RF switch
Microwave link transceiver
8 x EDI monitor
UPS, NMS and other support equipment
Load
8 Port Combiner system
8 Transmitter monitors
DAB+ Workshop
Proposed Network Architectures – Transmitter Sites
Redundant ETI streams
EMUX
A
EDI switch A
IP switch
Link transceiver
(main)
Link transceiver
(main)
IP switch
Exciter A
Transmitter
EMUX B
EDI switch B
IP switch
Link transceiver
(backup)
Link transceiver
(backup)
IP switch
Exciter B
DAB+ Workshop
Proposed Network Architectures – Transmitter Sites
Redundant ETI streams
Sat TRX A
EMUX
A
EDI switch A
IP switch
Link transceiver
(main)
Link transceiver
(main)
IP switch
Exciter A
Transmitter
EMUX B
EDI switch B
IP switch
Sat TRX B
Link transceiver
(backup)
Link transceiver
(backup)
IP switch
Exciter B
DAB+ Workshop
Proposed Network Architectures – Transmitter Sites
Trial System
Transmitter 4
EDI monitor
Satellite link transceiver
EDI over IP & inter Tx comms
RF
Transmitter 1
RF switch
Load
IP Router / Switch
Transmitter 2
RF switch
3 port Combiner system
Load
Satellite link transceiver
UPS
NMS and other support equipment
Transmitter 3
RF switch
Load
Transmitter monitor
DAB+ Workshop
Ancillary Equipment
DAB+ Workshop
Ancillary Equipment
•
•
•
•
Essential for system operation
Used to ‘glue’ the primary system components together
Provides support functions
Has a critical influence on system performance
Critical items
• NTP server
• IP switches and routers
• UPS
DAB+ Workshop
Ancillary Equipment
Don’t forget….
• Power systems back up
• Lightning protection and grounding
• MSTS for system access and control
Measurement tools
• Field measurements and analysis
• Monitors – RF transmitter, ETI/EDI
• Network Management System
DAB+ Workshop
Next Steps
The road is long…..
DAB+ Workshop
Next Steps
•
•
•
•
•
An assessment of the system cost has been undertaken
Given agreement to proceed the budget needs to be examined to
determine the level of redundancy possible
It is recommended to construct with an architecture as close to the full
system as possible to allow maximum systems and operations learning
A detailed analysis of the coverage area and interference analysis is
required to design the optimum transmission power and pattern ensure
maximum population coverage
The full system design should be undertaken including processes in the
operation redundant systems – there maybe some system enhancements
required
DAB+ Workshop
Next Steps
•
•
•
•
•
•
•
Site arrangements for equipment positioning
Tower access and antenna positioning
Operations planning – management, monitoring and maintenance
Equipment tendering and purchase
Factory and Site Acceptance Test plans
Trials test plans
• Testing different FEC rates
• Testing On-Channel Repeater capabilities (additional equipment)
• Testing SFN operation (additional equipment)
• Tuning coverage analysis and modelling tools
Engage with the industry
DAB+ Workshop
The future
DAB+ Workshop
Thank You
les.sabel@scommtech.com.au