RETB Next Generation - IRSE - IRSE Presentation.pdf · 128136 - RETB Next Generation 17-Feb-16 1...
Transcript of RETB Next Generation - IRSE - IRSE Presentation.pdf · 128136 - RETB Next Generation 17-Feb-16 1...
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RETB Next Generation
Project Overview for IRSE Scotland, 16-Feb-2016 Gordon Pringle – Senior Project Engineer IP SNE
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Plan for evening
Background to RETB RETB – Operational Use RETB NG – equipment configuration Chain Establishment Sequence Trainborne equipment Migration TPWS Frequency Converter Audio Console / MSS Challenges Interesting at Points
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Background to RETB
Far North Signal Boxes in 1978 Clachnaharry (still open). Lentran Nth Muir of Ord Dingwall Sth Dingwall Nth
Garve Achnasheen Strathcarron Kyle of Lochalsh
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Invergordon Tain Bonar Bridge Lairg Rogart Brora Forsinard Georgemas Jcn
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January 1978 – Storm brings down 40-50 miles of pole route between Tain and Georgemas Temporary Train Staff and Ticket Working introduced between signal
boxes 1980 – Derby Research develop BICU to allow electric block between signal boxes via radio bearer Oct 1984 – RETB System developed and implemented on Kyle Line Dec 1985 – RETB extended to Far North (Wick/Thurso) 1986 – RETB implemented on East Suffolk 1987/88 – RETB implemented on West Highland Line July 1988 – RETB extended south from Dingwall to Inverness Rose St 1988 – RETB implemented on Cambrian 2006-2010 – renewal of Motorola NRN basestations 2011-present – RETB Next Generation
Radio Electronic Token Block
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Only two RETB systems in the United Kingdom West Highland Line Controlled by Banavie SC 180 route miles 2off interlockings
Banavie South Banavie North
Far North Controlled by Inverness SC 230 route miles 1off interlocking to be split in two by project
Radio Electronic Token Block
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GRIP 1-3 Development – Babcock Comms Design Ltd Park Signalling GRIP 4-8 Implementation Principal Contractor – telent Equipment Manufacturer – Comms Design Ltd Train Fitment – Multipulse Inverness SSI Alterations – Park Signalling
RETB NG – Project Delivery
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The purpose of this project is to provide a fit for purpose Signalling and Track-to-Train communications system in lieu of migration to ERTMS, FTN & GSM-R. The West Highland and Far North RETB systems currently operate in the Band III sub-band 2 (196-206MHz) frequency spectrum. OFCOM have stated that these frequencies will be reallocated in December 2015 as the frequencies are required for Digital TV throughout Europe.
► From Dec 15 Network Rail would be exposed to interference from Ireland and Norway
The RETB Next Generation equipment will operate on Band III sub-band 1 (177-191MHz)
Why renew the RETB Radio Bearer?
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Conventional Signalling Colour light signals Semaphore signals
RETB A token (electronically) is issued to a Cab Display Unit in the drivers
cab by the signaller, or in degraded mode card working Authority to proceed is given by the signaller to the driver verbally
RETB System operates on an ‘Open Radio Network’ where all users can hear one another
Authority to Proceed
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Typical Token Exchange Point (TEP)
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Up Line Down Line
Typical Station
TS2
TS1
TS2 TSS
TS1 TSS
Comprises the following: Fixed Distant board Point Set Indicator Stop Boards Train Operated Points TPWS Loop Clear
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TEP to TEP (Token Exchange Point) Types of Token Section Long Section Shunt Engineering
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Typical Token Exchange
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Up Line Down Line
Typical Station
TS2
TS1
TS2 TSS
TS1 TSS
Driver – 4321 at Typical Station standing clear of the single line Signaller – 4321 press and hold send Driver presses send (co-operative exchange, signaller enters command into Interlocking) Driver – 4321 I have blank display Signaller – 4321 press and hold receive for token exchange Driver – 4321 I have Typical – Next Token on display Signaller – 4321 You have permission to pass the stop board at Typical and proceed to the stop board
at Next Driver – 4321 I have permission to pass the stop board at Typical and to proceed to the stop board at
Next. Signaller – 4321 message confirmed Driver – 4321 Down Loop Clear Typical Signaller – 4321 message confirmed
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Crossing Move at Dalmally
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Up Line Down Line
Dalmally Station TS2
TS1
TS2 TSS
TS1 TSS
4103 arrives at Dalmally from Loch Awe/Oban Data exchange 4103 has given up the token in rear and is awaiting instruction
2271 arrives at Dalmally from Tyndrum Lower/Crianlarich Signaller instructs double exchange Double exchange doesn’t work (various possible causes) so forward token then issued 2271 has permission to proceed
Signaller instructs 4103 to press receive for forward token Token successfully exchanged and driver given authority to proceed 2271 confirms Down Loop Clear Dalmally 4103 confirms Up Loop Clear Dalmally
4103
2271
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What gets renewed
Fixed Radio Infrastructure ► Network Transceivers (base stations) – (80 transceivers over 46 sites) ► Antennas and feeders ► Power Supplies
Mobile Radio Infrastructure
► Trainborne NRN Radio ► Trainborne Cab Display Unit (CDU) ► Transportable Token Unit (TTU) ► Portable Handset (Brunel) ► Depot Test Unit (DTU) ► NRN radio and CDU replaced with Cab Display Radio – (approx 220 cabs)
TPWS – (38 locations)
► Frequency Converter required to allow TPWS to operate on new frequencies
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Inverness specific works
Replace faulty 110V Signalling UPS with 230V Site UPS Split RETB Interlocking to allow two signaller operation
Comms Design Limited
RETB Next Generation Fixed Site Equipment
• Main Cell Site • Repeater Site • Link Site • Multi-Repeater Site • Local Cell Site • Repeater/Local Cell Site
Fixed Site Equipment Overview
• Main Cell Site • Repeater Site • Link Site • Multi-Repeater Site • Local Cell Site • Repeater/Local Cell Site
Fixed Site Equipment Overview
• Main Cell Site • Repeater Site • Link Site • Multi-Repeater Site • Local Cell Site • Repeater/Local Cell Site
Fixed Site Equipment Overview
• Main Cell Site • Repeater Site • Link Site • Multi-Repeater Site • Local Cell Site • Repeater/Local Cell Site
Fixed Site Equipment Overview
• Main Cell Site • Repeater Site • Link Site • Multi-Repeater Site • Local Cell Site • Repeater/Local Cell Site
Fixed Site Equipment Overview
• Main Cell Site • Repeater Site • Link Site • Multi-Repeater Site • Local Cell Site • Repeater/Local Cell Site
Fixed Site Equipment Overview
Fixed Site Equipment
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System elements
• Main Cell Site • Repeater Site • Link Site • Multi-Repeater Site • Local Cell Site • Repeater/Local Cell Site
• Cell Radio – Full duplex – provides lineside radio coverage • Link Radio – Half duplex – facilitates radio backbone bearer
4 additional Cell sites
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Antennas
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Dual band antenna with diplexor installed at certain sites to allow legacy and NG to share antenna system
Cell radios – 2-stack 2-dipole or 4 element yagi
Link radios – 5 element yagi and folded dipole
Glen Lochy 5-element Link to Dalmally 3 element legacy to Crianlarich Folded dipole NG Cell
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Driver 4103 sitting at Rannoch Driver Key’s system with PTT Radio Chain established from site to site Chain fully established – anything that driver 4103 says will be broadcast by every cell to all other users. Driver releases PTT and radio network tears down
Call Management
4103
4103 transmits Received by White Corries White Corries transmits what its receiving
Chain Establishment Sequence ≈ 30mS per link
Chain Tear Down ≈ 20mS per link
Comms Design RETB NG Train Equipment - Overview
Current RETB Equipment
CDU
Radio
Control Head
Comms Design RETB NG Train Equipment
CDR (Cab Display Radio)
Comms Design RETB NG Train Equipment
Concept
Combines functions of CDU, Radio Control Head and Mobile Radio
CDR has same envelope as legacy CDU
Eases installation
Keeps driver familiarity
Comms Design RETB NG Train Equipment
Familiar layout
Same controls as legacy CDU
Tamper-proof CDU Identification Number
Minimal user orientation
CDU
Comms Design RETB NG Train Equipment
Compact radio controls
Clear graphic display with more information
Simplified driver operation
Control Head
Comms Design RETB NG Train Equipment
Built into back of cab display unit
Space saving
Modern radio hardware
Mobile Radio
Comms Design RETB NG Train Equipment
Machined aircraft-grade aluminium enclosure
Comms Design RETB NG Train Equipment
Reverse printed overlays with EL illuminated legends incorporating hard display windows
Comms Design RETB NG Train Equipment
Handset DAC Ltd 'Tuff'
handset
Highly reliable military design
Proven in rail installations
Different appearance to GSM-R handset
Right or Left handed PTT buttons on side of earpiece.
Comms Design RETB NG Train Equipment
Handset Provenance
In use in NWR track-side telephones (RA708)
Installed in South West Trains Class 15x
Over 1000 in use daily in Tangara trains (Australia) installed by Siemens
Comms Design RETB NG Train Equipment
Junction Box
Distribution of power, data & audio services
Screw terminal connections for easy installation
Compact, low profile unit
Comms Design RETB NG Train Equipment
Antenna
Combined VHF & GPS Antenna
Same construction and dimensions as existing NRN antenna
Separate feeders for VHF and GPS signals
Comms Design RETB NG Train Equipment
RETB NG On-train equipment diagram
H a n d s e t
N R N J u nction Box
RET B / N R NC h a n ge-ove r
Sw itc h
R o o fs p e a k e r
C a b l e A
C a b l e B
Cab
le C
Cab
le D
C a b l e E
C a b l e F
C a b l e G
C D R
Ca b l e #Co n s t r uct i o n E x a m p l e H & S p / nMa x . l e n g t h O / D ( m m )
A 5 x ( 2 x 0 . 5 ) 1 2 5 6 6 5 3 3 1 0 m 9 . 3B 2 x 2 . 5 1 2 5 5 6 7 9 4 1 0 m 6 . 6C 50RCo a x S X _ 0 4 1 7 2 _B- 6 0 1 0 m 5 . 5D 50RCo a x S X _ 0 4 1 7 2 _B- 6 0 1 0 m 5 . 5E 2 x 2 . 5 1 2 5 5 6 7 9 4 1 0 m 6 . 6F 4 x ( 2 x 0 . 5 ) 1 2 5 5 5 6 0 5 1 0 m 8 . 0G 2 x 0 . 5 1 2 5 5 6 7 5 6 1 0 m 4 . 0H 2 x 0 . 5 1 2 5 5 6 7 5 6 1 0 m 4 . 0J T B A T B A T B A T B A
C a b l e H
E x i s t i n g �Tra i nP S U
L e g a c yC D U
C a b l e J
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Auto tuning Why? User expectation that systems should require no manual
intervention. We thought that we could. How does it work? Every cell radio broadcasts a pip every 10 seconds. All radios (Cell, Link, CDR, TTU) have a GPS receiver that ensures
that pips are broadcast and listened for, at the exact same time. Signal strength is ranked for each system and channel CDR/TTU will auto tune when RSSI falls below specified value
Operational Change Driver must select the System/Signaller New signage to inform driver which system they should be selecting
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Migration Strategy
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Radio Control Rack
Audio Console
Legacy Network Deploy Parallel NG network for link testing Test Backbone from end to end Back cab testing to demonstrate RF coverage Connect Parallel network – confirm no legacy interference Back cab testing for Audio and Data
NG Test Audio
Console
Back cab tester CDR
CDR in front cab
CDU
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TPWS Frequency Converter
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Antennas and feeders renewed Some antennas re-aligned to
new Cell locations 12V TJ Transformer 2off Frequency Converters per
site Sites commissioned during day
between trains (hours at a time)
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Audio Console
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PC/Touchscreen Positive indication of BT link status Caller Identification Alarm Indications
Splitting & Combining
• Systems can be controlled combined (e.g. WHL N & S together), or split.
• Calls are made to, and received from, both parts of the system using both audio consoles when combined.
Comms Design Limited
RETB Next Generation Maintenance Support
System
Current Issues
Network Mimic
Site Health Graph
Base Health Graph
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Depot Test Unit
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Allows CDRs and TTUs to be tested off line
Can be fixed to antenna system and power (Corkerhill)
Portable (Queen St) allows fitter to replace CDR and undertake co-operative test by themselves
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Transportable Token Unit
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Allows engineers/track workers to take line blockage (Engineering Token)
6hr Battery (stops vehicle engines idling)
RS485Adaptor
Advanced Features Allows S&T to
access MSS functionality without attending site
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Any enhancements?
Multiple landline connections ► Make system more resilient to single site failures
Altered System Architecture ► Eliminating problem links
Additional Lineside coverage ► Modular solution of Cell and Link Radios allows supplementary
coverage to be provided at repeater sites • Spean Bridge, Corrour, Glen Lochy, Crianlarich, Inverannan,
Garelochead, Forsinard & Invergordon ► New sites at Connel, Mallaig, Balnacra Level Crossing and possibly
Kyle of Lochalsh ► Replaced White Corries REB
Auto tuning of train radio ► Easier for driver ► Reduced Lineside signage
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Far North
All radio and trainborne infrastructure renewed as per West Highland Line Far North Split
► Interlocking split into two at Invergordon ► Will allow capacity increase
• Although Rules of the Plan will require additional dwell time for all services at Invergordon
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RETB Next Generation equipment
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White Corries – new REB beside mast
Fairly harsh environment
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Connel – temporary install during construction
Mallaig – RETB NG antennas supporting both RETB and TPWS
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Challenges
Timescales to develop new products (from scratch) • Radio transceivers, Fixed Site Interface, Cab Display Radio, Audio
Console, Transportable Token Unit, Depot Test Unit, TPWS Frequency Converter & Hand portables
Parallel radio networks Train design and fitment Stakeholders – TOCs, FOCs, ASLEF, ORR, RSSB Geography Removing working CDUs from in service trains - scary Fixing legacy issues Audio Ramping Electrically noisy trains Questions?
Such a pleasurable experience working with people on West Highlands: Can do attitude Signallers and drivers on first name terms wishing one another a
good morning or good evening MOMs, signallers and S&T so helpful ScotRail very helpful
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Questions?
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System refinements (warts)
Pulpit Hill site abandoned Audio ramping Auto tuning algorithm tweaked to improve cell handovers Localised black spot identified on Up Taynuilt at 2-car stop board
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