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Please Help: Banking network design

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Ex Member
Ex Member

Sep 26th, 2009 at 5:56pm  

Please see below technical specification of a tender posted by a local bank. I need to know what kind of queris can we made according to below tender as they already mentioned 8,5 MHz bandwidth required by them this is analogue bandwidth and digital bandwidth is given as

8 remote sites 512 kb/s
5 remote sites 1 mb
2 remote sites 2 mb

with synchronous and Asymetric

i need to know how they calculate this analogue bandwith for mentioned sites and is this bandwidth is sufficeint and what meant by synchronous and asymetric.

Also as cable lenthe mentioned like 400 ft which can cause loss in RF cable like RG 6 cable if this is DVB-S2 based solution as i think.

What kind of system has mentioned characterstics as mentioned in this tender.

Moreover what kind of other queries and why can be asked. please help.

looking forward to hear soon from you

Section IV. Technical Specifications

The Bidders will be required to design, devise, supply and implement the VSAT solution, which can connect SBP field offices with the Backup Data Center (Annex building) SBP at SBP Main building Campus, I.I Chundrigar Road, Karachi in star topology having a central satellite hub that must have Rack-mountable chassis, Support for star, mesh and SCPC topologies and Built-in redundancy with fail-over capability to be installed at Backup Data Center in Learning Resource Center, Main Campus of State Bank of Pakistan, I.I Chundrigar Road Karachi.

The Bidders are strongly advised to focus on the scope of the project as given below:

The scope of the project is summarized below:

Review the requirements with sizing for infrastructure components, such as RF cables, Dish, RF equipment, all Indoor and Outdoor components, carrier, frequencies, losses calculations, survey and analysis of required civil and electrical power cabling work and any other necessary work to establish VSAT based network of SBP. A tentative summary of the site surveys is given below:

S. No
Cable Length (approx)


VSAT network will provide:

Emailing Systems on Microsoft platform on Microsoft Windows 2007 Server.

The Supplier shall provide the solution document supported by the brochures of equipment, cables, components, software proposed, bandwidths and the Satellite over which the links will be given to Purchaser. All other technical operational detail is also anticipated.

The successful bidder should install, configure and maintain the supplied equipment according to the requirements of the Purchaser by trained/certified technical staff so as to get the maximum functionality of the products. The Bank will be provided reasonable access and assistance to required technical details.

The timeline of the project will be 16 weeks including the Delivery Time Period, from the Date of Signing of the Contract.
Maximum bandwidth at the two groups would be as below:
SBP will prefer Pakistani Satellite, however bidders may quote other safer options (in the context national security factor) satellite such as Chinese, Japanese Satellites, Thai, Hongkong, Singaporean, AsiaSat, Eurosat etc.
The total required satellite bandwidth pool will be 8.5 MHz with contention ratio of 1:3, and bidder must design and size RF components accordingly and to the appropriate modulation technique matching the satellite link budgeting that could guarantee 99% availability of the links. Following is the bandwidth grouping for the different SBP offices:
Hyderabad, Quetta, Sukkur, Bahawalpur, Gujranwala, Sialkot, D.I Khan and Muzaffarabad - 512kbps each (full synchronous & Symmetric)
Multan, Faisalabad, Islamabad, Rawalpindi & Peshawar - 1Mbps each (full synchronous & Symmetric)
Lahore & Hyderabad – 2Mbps each (full synchronous & Symmetric)
Accordingly the sizing at RF side should be made by the bidder.
The central site equipment should have capability to share bandwidth between the two or more groups, on as and when needed basis and should support frequency hopping.
The links will have to be encrypted using AES 128/256bit standards.
However all of the above technical specifications can be discussed and finalized in the Pre-Bid Meeting to held at the specified date, time and location mentioned in the IFB.
Solution 1: Ku-Band
Solution 2: C-Band
It is the bidder’s responsibility to undertake the task of testing the frequency band before quoting solution whether the band is safe and reliable to be used for the required communication and there are no operational hiccups in establishing and running the setup without interference at all sites.
Bidder will be responsible to get the Frequency Spectrum Registration from the concerned service provider, telecom regulator (if required so by the law) on behalf of SBP, for which all required financials should be accordingly quoted in the financials in its bid.
Network Capability:
The network should be able to operate at least for networks up to 20+ sites.
Capable to Increase bandwidth as needed on-the-fly between the sites from the bandwidth pool
Configurable carriers in 1Kbps increments and add new remotes easily without increasing satellite capacity.
Network Topology- Star
1 x or preferably 2 Ethernet 10/100Mbps Port Switch with 802.1q VLAN support
RS-232: RJ45 (for GPS or Console connection or Antenna Pointing)
Protocols Supported- TCP, UDP, ICMP, IGMP, Dynamic Routing protocols support RIP Ver2, OSPF (Preferred if available), Static Routes, NAT and DHCP
Two way AES 192 & 256 bit encryption
SNMP Support version 2 and preferably above, with required MIBs to be provided for Management and monitoring purpose
Traffic Engineering QoS, Minimum CIR, CIR (Static and Dynamic), Rate
Limiting, Bandwidth on Demand
Operating Temperature 0 to 40 Degree Celsius
Input Voltage 220/230 VAC Universal Input, 50-60 Hz
Must have automatic uplink power adjustment at remote sites
Should support Forward Error Correction in both directions
Have built-in jitter handling for real-time traffic
1. Integrated NMS System

The proposed solution should comprise of a Centralized Management Station at PURCHASER end, to monitor and manage the complete VSAT Network from a central point.

The software should provide a Management and monitoring platform that enables centralized control, traffic pattern analysis, and bandwidth utilizations, RF level monitoring and testing alert mechanism in case of any event, maintain history for all of the links status and utilizations and VSAT equipment at RF and TCP/IP levels of the VSAT network and preferably the related infrastructure components. All Features should be manageable from NMS Application QoS, CIR, VLANs, IP Configuration, monitoring, fault isolation, analysis, flexibility, password management and simplify maintenance.

Automatic alerts and warnings in events of link, equipment or component failures and Interferences as well as other operational issues
Network performance statistics in network, in and out route, remotes and at IP packet level
Reporting capabilities for the network utilizations, failures, link errors, link usage and other RF, TCP and IP level reports
Configure or modify individual remotes, groups of remotes, or the entire network – all from one central location
In-depth views into both real-time and historical performance of the network including the health status of remotes, graphical displays, network probes and detailed bandwidth usage
NMS must support Configuration, Monitoring, Analysis, Provisioning, Reporting, Maintenance
The NMS must provide for centralized management of software upgrades & configuration changes
The network must continue to operate even if the NMS system is offline
NMS must have the ability to gather and display RTT times from remotes
All aspects of NMS must be GUI based for ease of management
NMS must have the ability to take remote on and offline remotely
NMS must provide remote authentication
NMS must have the ability to manage multiple networks and hubs
Authentication and privilege setting of NOC operators
NMS must provide IP and satellite communication statistics, both Real-time and historical
NMS must be able to provide statistics for all QoS parameters configured
NMS must provide client to allow remote user to monitor the network
NMS must have a distributed NMS architecture to allow for scalability
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« Last Edit: Sep 26th, 2009 at 7:45pm by Admin1 »  
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Eric Johnston
Senior Member

Posts: 2109
Reply #1 - Sep 26th, 2009 at 7:44pm  
Find the specification for the modems you propose to provide, e.g. Vipersat CDM570L and make financial model of a variety of modulation and coding methods and dish sizes with costings so as to make a proposal with initial capital cost and running costs that will appeal to the customer - and be competitive with other bidders.

QPSK/OQPSK Rate 3/4 Turbo Threshold BER=10E-8 Eb/No=4.4 dB Allocated bandwidth per Mbit/s = 951.6 kHz
8-QAM  Rate 3/4 Turbo Threshold BER=10E-8 Eb/No=7.2 dB Allocated bandwidth per Mbit/s = 634.8 kHz
16-QAM  Rate 7/8 Turbo Threshold BER=10E-8 Eb/No=8.3 dB Allocated bandwidth per Mbit/s = 408 kHz

Note that using the highest order modulation (and least coding) doubles the available bit rate  e.g. 8.5 MHz gives 8.9 Mbit/s with QPSK 3/4 or 20.8 Mbit/s with 16-QAM 7/8.  Alternatively the monthly cost could be proportionally lowered.

Note that using the highest order modulation (and least coding) increases the once-off capital costs for advanced modems and larger dishes sizes.

You can work out your own allocated transponder bandwidths (MHz) based in information bit rate, FEC code rate and modulation method.
Work out the symbol rate and multiply by about 1.35 - 1.43   The exact multiple varies between modems and your judgement regarding adjacent carrier interference allowance.

Regarding "synchronous and asymetric", I would ask for explanation of "synchronous". "asymetric" could mean "asymmetric" and refer to carriers of different capacites in each directions, as for internet access,
on the other hand it could mean "asynchronous", the opposite of synchronous. I would ask for explanation.

It is important that you clarify all interfaces required.  In one place the ask for ethernet.  In another place thay say "full synchronous & Symmetric"  Symmetric obviously means the same in each direction but they may want 2 Mbit/s interfaces ( G703 E1 2048 kbps ? ) synchronised with their own transmit clocks.

Modems like CDM570 have alternative interfaces, EIA-422, X-21, V35, Sync EIA-232, G703 E1, G703 T1 or 10/100 BaseT ethernet with IP QoS processing.

Don't promise what you can't provide or can't understand.

Best regards, Eric.
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« Last Edit: Sep 26th, 2009 at 10:47pm by Admin1 »  
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Ex Member
Ex Member

Reply #2 - Sep 28th, 2009 at 5:09am  
Dear Eric

Thanks for your instant reply in this regards, I think they would go TDM/MF-TDMA solution now it depend on us which product we would provide iDirect, Huhges, ViaSat.

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Eric Johnston
Senior Member

Posts: 2109
Reply #3 - Sep 28th, 2009 at 2:09pm  
Is there any reason why Vipersat CDM570/CDM562/CDM564 will not do the job ? Meets your "TDM/MF-TDMA" concept perfectly.

Read more:

Best regards, Eric.
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