Download L.38.1.1

A.
Technical Approach to Service Delivery (L.38.1(a)) (L.38.1.1)
The offeror shall prepare its Technical Proposal to address all mandatory requirements specified in this RFP. All offerors shall address the
mandatory requirements identified in Sections C.2, C.5.1 through C.5.2.6, C.5.2.9 through C.5.6, C.6.2, and C.6.3. The Technical Proposal
shall be divided into the following three parts plus all specific plans and descriptions associated with the Technical Proposal. No prices or
other cost information shall be included in any of these sections.
Sprint’s technical approach illustrates an evolutionary plan for services grown from an
infrastructure that was conceived in 1981. It is a design that enables the highest quality of
services to our current customers and is forward looking in that it accommodates a clear
migration path to satisfy our customers’ future needs. This clear vision, a stable leadership,
and world-class technical talent are responsible for Sprint’s many firsts in the
telecommunications industry, including:
•
The first nationwide deployment of a 100 percent digital fiber backbone utilizing
Asynchronous Transfer Mode (ATM) technology
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The first long distance carrier to deploy Signaling System Seven (SS7)
•
The first to provide a virtual network service
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The first nationwide Frame Relay service
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The first to deploy a public data network over fiber backbone
Sprint has enjoyed a strong partnership with the US Government in over 200 separate
contracts providing advanced telecommunications products.
Sprint’s architecture includes extensive interoperability and architectural migration
capabilities. These features ensure that customers will be supported on Sprint services, now
and in the future. The current technology upgrade of the Sprint Network will include XXX
Synchronous Optical Network SONET Bi-directional Line Switched Ring (BLSR) rings
XXXXXXXXXXXXThis architecture, pioneered by Sprint, has proven to be so robust that
many of Sprint’s competitors are including parts of it in their own networks.This long-term
approach to network planning is merely the implementation of the vision of Sprint’s stable
core leadership team “…to supply our customers with the best value of services found
anywhere in the world.” With Sprint, GSA will team with a telecommunications service
provider that has a proven track record of customer care and effective agency working
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relationships. Sprint also brings to the partnership a competent, leading edge company, using
proven and well thought out network development plans. Sprint’s plans are proven in today’s
highly competitive telecommunications market. Our plans enable Sprint to incorporate
leading edge capabilities and services in the network – by design, not by acquisition, to meet
customers needs. By listening carefully to customers, Sprint plans, builds, and designs the
network to meet the customers’ needs.
Our multi-faceted approach to network design enables Sprint to develop numerous
services compatible with the Sprint Network and our customers’ high expectations.Over the
past ten years of the GSA’s FTS2000 contract, for example, Sprint has teamed with the
Government to advance unique Government requirementsinto a commercial set of unique
enhanced toll free services. Proof of concept trials for the Army led to the development of
the ATM service offering.
Sprint will continue to provide advanced services to the Government as they are
employed in the network, today, and tomorrow. Services will be the leading edge of
tomorrow’s advanced intelligent network using technologies not yet envisioned. Sprint’s
track record over the past twenty years supports the forward looking vision and planning
which limit the risks to the Government. Sprint is proud to serve and partner with those who
serve America.
1.0
Service Requirement of FTS2001 (L.38.1(a))
L.38.1(a)Technical Approach to Service Delivery. The offeror shall:
(1)
Analyze the service requirements specified in this solicitation
Sprint will provide telecommunications services in accordance with the requirements as
specified in Sections C.2.1.1.1 (Circuit Switched Data Service (CSDS), Switched Data
Service (SDS), Dedicated Transmission Service (DTS)), C.5.1 through C.5.2.6, C.5.2.9
through C.5.6 (National Security/Emergency Preparedness), C.6.2 (Service-Specific Monthly
Reporting), and C.6.3, Daily Performance Data Requirements. The specific plans and
descriptions associated with the Technical Proposal are listed in those individual sections.
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To meet the FTS2001 needs, the service requirements as specified in the solicitation have
been be divided into three categories for inclusion in the Sprint Network:
•
Requirements for services that exactly match the specifications for commercially
available services,
•
Requirements for services that are similar to commercially available services, and
•
Requirements for services that are unique to the Government and that may or may
not become commercially offered products by Sprint.
Sprint has crafted a sound, forward-looking technical solution that provides the
Government a sound technical approach, exceptional value, low risk, is easily supported, and
is scaleable.
There are several instances where the Government has requested features, specifications,
capabilities or combinations of these that are not an exact match with Sprint's commercial
product. In all cases, Sprint will fulfill the Government's requirements as stated in the
proposal. There is no additional cost to the Government for the modifications to Sprint's
network infrastructure, systems, or processes for delivering the services as specified in the
RFP.
For services that precisely match Sprint’s commercial offerings, the Government will be
receiving mature products, sustained by Sprint’s back office support systems. These systems
have a proven record with large corporate telecommunications users. These offerings are low
risk, widely available, and feature-rich.
For services that are similar to Sprint’s commercial offerings, but not an exact match,
modifications to Sprint’s network infrastructure, systems, and processes will be necessary.
The offerings will be based on the Sprint commercial offerings, so these services ensure a
low-risk offering. Any such modifications are delineated in the individual service sections.
Some of the services requested as part of the solicitation are not commercially available,
and may or may not ever be offered commercially. These unique Government requirements
may not have a commercially available service basis; therefore, they may be a customdesigned offering. This translates to a medium-risk, feature-limited, non-ubiquitous service.
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Sprint has made a concerted effort to minimize solutions that fall into this category. Sprint
believes it is in the best interest of the Government to provide a high proportion of the
services that are either commercially available products or their slightly modified
counterparts. Mandatory unique requirements, where specified, are crafted into the most
user-friendly and reliable service possible. Where there is a lower risk solution that can be
offered in lieu of the stated requirements without suffering loss of functionality or
operability, Sprint has identified alternative solutions. Sprint has also described how these
solutions fulfill the spirit of the requirements and what impact these alternative solutions will
have on the Government user.
Sprint does not anticipate employing new or additional technology, systems, processes,
procedures, or capabilities to fulfill the requirements of this solicitation except as delineated
in the individual service sections.All capabilities are scheduled to be introduced prior to
migration or transition and are part of Sprint’s normal business rollout of new or enhanced
service introduction. As such, Sprint has determined that it will not be necessary to develop
or otherwise provide the Government a customized technical solution to fulfill the
requirements of this solicitation.
2.0
Approaches to Service Delivery (L.38.1(a)(2)) (L.38.1.1)
L.38.1(a) (2) propose logical and reasonable approaches to service delivery
L.38.1.1 The offeror shall describe the means by which the requirements specified in Section C shall be delivered to the Government. As
appropriate for the service and its supporting network, the offeror shall address:
2.1
Overall Network Architecture (L.38.1.1(a))
L.38.1.1(a) The overall network architecture, including the types and capacity of the transmission and switching media, the transmission
facility(ies) configuration, and the type of equipment used in its network.
Sprint’s services are provided over an all digital, all fiber-optic backbone network using
digital switching architecture and supported by sophisticated management control systems.
These elements provide a highly reliable, proven, and redundant network. The design of the
Sprint network delivers survivability at the backbone or transmissionlevel and at the service
level. The Sprint network minimizes the adverse effects of service interruptions due to
equipment failures, cable cuts, network overload conditions, or regional catastrophes.
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Sprint is in the process of implementing our Broadband Intelligent Network, a SONET
transport facility with ATM switchingSprint is already installing SONET on the fiber rings in
our current network—leveraging our investment and endorsing our original vision of a 100
percent digital, fiber-optic network with powerful ring architecture. At the end of 1997, we
had completed initial SONET deployment XXXXXXXXXXXFull deployment is expected
by 1998XXXXXXXXXXXXXXXXXXXXXXXX
Sprint’s SONET architecture is based on a 4-fiber Bi-directional Line-Switched Ring
(BLSR) design. The 4-fiber BLSR consists of two pairs of fiber, with one pair designated for
working traffic and one pair for protection. Bi-directional means Sprint is capable of sending
traffic in either direction on a ring, allowing Sprint to route circuits on the most efficient
paths through the network. Figure 1.A.2-1 illustrates the normal pattern of traffic on the
Sprint SONET network. This reduces the number of potential failure points and increases
reliability. In the unlikely event of a failure, all traffic on the working pair is switched to the
protected pair, to 100 percent operational capability.
Figure 1.A.2-1
Normal Traffic Pattern on Sprint’s SONET Network
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SONET ring architecture also raises network survivability to new heights—providing
restoral capabilities to servicesin less than a second. Sprint demonstrated SONET’s “selfhealing” capabilities in November of 1994 by cutting an actual fiber-optic cable on a ring
running through the Chicago area. Restoration occurred in 10 milliseconds and service
continued without interruption. In June 1995, a piece of heavy machinery cut Sprint’s cable
between Anaheim and San Diego. Because the section was on a 4-fiber, bi-directional, lineswitched SONET ring, as shown in Figure 1.A.2-2, traffic was rerouted in under 50
milliseconds–less than the blink of an eye.
Figure 1.A.2-2
SONET Traffic Pattern After a Cable Cut
Sprint was the first, and is currently the only, nationwide carrier to deploy SONET in this
fashion. Other carriers may have limited SONET BLSR topology in their backbone.
Typically, the few carriers who do use SONET have adopted a questionable linear SONET
architecture instead. This “straight ring” architecture, shown in Figure 1.A.2-3, scarcely
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provides any of the advantages of the SONET protocol, since a fiber cut anywhere on the
path will still cause a sustained outage. Restoration will usually take at least several minutes,
and in some cases, hours.
Figure 1.A.2-3
Linear SONET (Straight Ring) Network Disadvantages
The Sprint SONET backbone provides the transport media for launching Sprint’s family
of services:
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Circuit switches
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Private Line
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X.25
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IP
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BISDN
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ATM
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Frame Relay.
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Sprint’s SONET ring architecture is the superior choice for backbone design. Sprint has
implemented this architecture years ahead of other long distance carriers.
Transmission Equipment
Switching and routing of customer services is provided to customers based on specific
requirements. The output of the network is either a DS3 or OC3 circuit provided by the Add
Drop Mux (ADM).This output can be applied directly to a Local Exchange Carrier, the
Frame Relay Switch, a Digital access and cross connect device, M13 multiplexor, or IP
Router. DMS 250 switchesare the core long distance capability for switched voice and
switched data applications below data rates of T1. XXXXXXXXXXXXXXXXXXXprovide
International Gateway functionality for routing and translation between different signaling,
sampling, and compression algorithms.
Voice Switching Network
Digital circuit switching hardware architecture is based on a redundant design concept. If
a hardware or software failure occurs, the systems automatically switch from the active to
hot standby components without service interruption.
Physical route diversity provides redundancy in the network for intermachine trunking. If
a route interruption or major network overload occurs, a portion of the InterMachine Trunk
(IMT) traffic continues to be carried on the remaining physically diverse route(s).
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Sprint also uses a flat network architecture (non-hierarchical routing) approach on its
circuit switched network. In this topology, every switch in the network is directly connected
to every other switch by at least two physically diverse routes. This architecture enables
Sprint to route calls faster, through fewer switches than a traditional hierarchical topology.
Fewer switching points also reduce possibilities of failure, reduce electric component
induced noise, and reduce call failures by making routing less complex.
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Fiber Backbone Loop Topology and Reconfiguration for the Voice Switching Network
Fiber-optic cable routes include redundant capacity for hot standby fiber-optic systems
and alternate paths to provide for network rerouting in the event of a route failure. The fiberoptic backbone topology is XXXXXXXXXXXXXXXXXXXXto ensure sufficient alternate
paths exist for network
survivability.XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The Voice Switching Network is implemented over the Sprint core backbone SONET Ring
Network. This transmission equipment provides interconnection between various nodes on
the Sprint Network.This system is comprised completely of SONET Fibers operating at
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XXXXXXXXSignaling System 7 (SS7)
Sprint utilizes Signaling System 7 (SS7)—the latest industry standard for transmitting
signaling information in a switched network. Using a flexible database retrieval system, SS7
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provides faster call set-up times, more customized features, and network management
flexibility. Sprint was the first Inter-exchange Carrier to fully deploy SS7 in its switching
network. SS7 utilizes is own network, independent of the voice network, to signal between
voice switch platforms. This allows the voice system to be queried in advance of a call
entering the network to see if network capacity and terminating equipment is capable of
accepting the request. If resources are not available, the call is not allowed to enter the
network. This feature protects network resources from being needlessly used to process calls
which can not be terminated.
The three main components of an SS7 system are:
•
Signaling Point (SP): The SS7 interface to XXXXXXXXXXXXXXXXXXin the
Sprint network.
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•
Signal Transfer Point (STP): XXXXXXXXXthat routes SS7 messages
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Service Control Point (SCP): This
database contains customer-specific and network routing information such
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nd is connected to the network’s STPs. Non-switching information, which previously
resided in the switches, is now stored in the SCP, thereby increasing the available capacity in
the switches for actual switching functions.
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Rationale for Network Architecture Design (L.38.1.1(b))
L.38.1.1(b) The rationale for the network architecture design.
Sprint chose both the technology and the architecture design of a fiber-optic network
because it provides the following significant advantages over other technologies:
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•
Quality - Since voice, data, and video are transmitted using fiber-optic technology,
the problems of older copper, and even modern microwave, transmission simply do
not apply. Due to our digital transmission facilities, noise, hiss, electrical
interference, weather impact, and fading are virtually eliminated on the Sprint longdistance network.
Sprint’s deployment of SONET technology enhances the already superior
capabilities of our fiber-optic network by enabling the remote control of operations,
administration, maintenance, and provisioning for multiple SONET elements. We
re-establish and maintain a high quality of service immediately and automatically,
often without human intervention after a breakdown or degradation in service.
•
Economy -The overall quality, architecture, and advanced technology of digital
fiber-optics makes transmission so dependable that it costs less to maintain, thereby
allowing Sprint to pass on greater savings to the Government.
•
Expandability - As demand for network capacity grows, the traffic-carrying
capacity of the existing single-mode fiber is easily expanded by augmenting or
replacing existing transmission equipment with the latest high-speed equipment.
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XXXXXXXXXXXXXXXXXXX• Survivability - Network survivability is the
ability of a network to cope with facility outages and/or demand overloads. As
described above, Sprint provides a highly reliable and survivable network during
any single cable cut. Sprint has over 26,000 route miles of its fiber-optic network in
place and in service, with at least one Point Of Presence (POP) in each major city of
all 196 LATAs.
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XXXXXXXXXXXXXXXXXXXXXXXXXA complete list of POP locations is
available upon request from Sprint. The SONET transport equipment Sprint is
deploying has logic at the site to reverse the flow of traffic and restore service in
milliseconds, without having to send data to a central processor for analysis and
decisions.On the SONET rings, transmission is restored in amatter of milliseconds in
the event of a fiber cut or optical system failure.
•
Reliability-Sprint achieves reliability through a corporate commitment to maintain
or surpass our system objectives. Beginning with network design, reliability and
efficiency are built into the system. Network reliability is improved through the
addition of technologies such as SONET BLSR rings and Signaling System 7. The
effectiveness of this highly reliable and survivable network is attributed to redundant
transmission and switching hardware configurations, fiber-optic loop topology, and
sophisticated network management and control centers.
Traffic on Sprint’s survivable SONET rings has an automatic, alternate route from
point A to point B inherent in the ring design. In the event of a fiber cut between A
and B, traffic is rerouted instantly and automatically in the opposite direction on the
protected channel to point B.
•
Security-Fiber-optic facilities are the most secure transmission media available
today. The very nature of the fiber makes it extremely difficult to tap.The fiber-optic
medium meets the National Security Emergency Preparedness standards and is
currently in use by the National Communications System (NCS) to provide
Government Emergency Telecommunications Service (GETS) for National
Command Authority. Because the network is fully digital, Sprint is able to support
more sophisticated encryption methods than if the network were analog or a
combination of analog and digital.
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2.3
Congestion and Flow Control (L.38.1.1(c))
L.38.1.1 (c) Congestion and flow control strategy including redundant switch and transmission facilities, control mechanisms, and the
degree of flexibility inherent in the architectural design to handle predicted and unpredicted increased traffic loads and/or switch and
transmission failures.
Congestion, caused by events such as switch loss or focused termination are handled in
the control modules of the Signaling System 7 (SS7)
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXThe SONET transport equipment which
Sprint is deploying has logic at the site to reverse the flow of traffic and restore service in50
to 250 milliseconds, without having to send data to a central processor for analysis and
decisions.
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XXXSprint’s network operated without disruption during disasters such as hurricanes Hugo,
Andrew, and Iniki; the San Francisco earthquake; the Los Angeles earthquake; and the heavy
California rains of January 1995, and January 1998.
The network withstood serious damage in the Los Angeles quake. Generator power was
required at about a dozen regenerators and POPs along the network, but service to customers
was not affected.These stresses on Sprint’s network validate the overall design of Sprint’s
network and underscore the inherent reliability and survivability.
2.4
Sprint Equipment at Government Locations (L.38.1.1(d))
L.38.1.1(d) The amount of the offeror’s equipment that would be required at Government locations to deliver the services, including the
amount of power, floor space, along with heating, ventilation, and air conditioning loads.
Sprint will locate different types of equipment at Government locations, dependent upon
the access type, services required, User-to-Network Interfaces (UNIs) delivered, and other
factors. The Government can be assured that Sprint will make every effort to minimize the
size, power, and heat dissipation requirements of Sprint equipment.
Where it is cost effective to aggregate traffic for multiple Service Delivery Points
(SDPs), Sprint may deploy connection equipment at Government locations. For example, to
enable aggregation of traffic at Fractional T-3 or T-3 capacity, Sprint may elect to install a T3 access concentrator. This equipment will have specific requirements for installation which
may need to be provided by the Government. In each of the service offerings the equipment
which may be required to be installed is listed. Table 1.A.2-1 shows how the specifications
are listed in each of the sections:
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Table 1.A.2-1 Example of Equipment Specifications
Size:
5.5x12.5x17.5 inches
Weight:
15 pounds
Power:
115 VAC 60 Hz
Base Power Dissipation:
40 Watts, 137 BTUs
Operating Temperature:
32F to 122F 95 percent RH (noncondensing)
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tional equipment needed to provide UNIs at the SDPs are detailed in the individual service
descriptions.
2.5
Traffic Calculations (L.38.1.1(e))
L.38.1.1(e) Traffic calculations that indicate network and service performance during estimated normal, 10 percent, 25 percent, and 50
percent above the estimated normal FTS2001 traffic loads and the means to ensure achieving the required performance as specified in this
solicitation.
Sprint’s network will pass the toughest stress test under any predictable GSA loading
scenario. Our network will function without effect on quality of performance when various
percentages of loading increase are applied to projected FTS2001 average switched service
loading. The increase in traffic calculations indicate that network and service performance
will not be affected at usage levels of XXXXXXpercent above the estimated normal
FTS2001 traffic loads. To calculate Sprint’s capability to carry FTS2001 traffic increases, we
compared the XXpercent increase in total FTS2001 estimated traffic to Sprint’s excess
capacity observed during historical XXXXX loads.For example, the estimated monthly
traffic FTS2001 switched voice traffic of 383,883 kilominutes. This is an average daily
volume of 18,280 kilo minutes and applying XXX percent peak yields 27,429 kilominutes
per day. Sprint has engineered its network capacity to ensure that at peak
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