Southern Light Rail

What Southern Light Rail does

Southern Light Rail (SLR) is a Georgia Tech-affiliated non-profit corporation headquartered in Atlanta that operates high-performance fiber optic network infrastructure for research and education institutions in the southeastern United States. The organization's core platform, Southern Crossroads (SoX), provides high-bandwidth, low-latency connectivity and network peering services, offering more than 200Gb/s of access capacity to Internet2 and ESnet through its 56 Marietta co-location facility in downtown Atlanta. SLR serves as the regional aggregation layer connecting universities, federal research agencies, and private sector research organizations to national research networks, with a named participant base of roughly 20 institutions across Alabama, Florida, Georgia, South Carolina, Tennessee, and Virginia.

SLR's technology stack centers on point-to-point dark fiber deployments and shared peering infrastructure, with engineering and operational support delivered under a cooperative research contract with the Georgia Tech Office of Information Technology. Membership in The Quilt consortium provides access to collective ISP purchasing arrangements that lower unit costs for participants, and network peering relationships with Florida Lambda Rail and the Mid-Atlantic Research Infrastructure Alliance (MARIA) extend the fabric's reach into adjacent regional networks.

The business model is a cooperative membership structure funded through participant fees and institutional agreements rather than commercial product sales. SLR is governed by a board of directors drawn from Georgia Tech and member institutions, with Cas D'Angelo serving as President and a small staff of approximately 11 handling engineering, network architecture, and treasury functions. The organization does not publicly disclose pricing and operates primarily through consortium outreach and direct institutional engagement rather than traditional marketing channels.

Name

Southern Light Rail

Legal name

Southern Light Rail

Website

https://southernlightrail.net

Company type

Private

Founded year

1997

Operating status

Operating

Headcount range

11–50 employees

Short description

Southern Light Rail is a Georgia Tech-affiliated non-profit that operates high-performance fiber optic network infrastructure, providing research universities, federal labs, and healthcare institutions across the southeastern United States with access to Internet2, ESnet, and peer research networks.

Ownership category

akta.pro rank

Product category

Research Network Infrastructure

NAICS

Wired and Wireless Telecommunications Carriers (except Satellite) (51711)

SIC

Communications Services, Nec (4899)

akta.pro industry

PRIMARYHDAIAFAE

IP Transit & Peering Services

Hardware, Technology & Telecom/Telecommunications & Network Services/Data & IP Network Services (MPLS, SD-WAN, Ethernet)

SECONDARYHDAIALAH

Cross-Border Terrestrial Fiber Corridors & International Terrestrial Gateways

Hardware, Technology & Telecom/Telecommunications & Network Services/Subsea & Long-Haul Fiber Networks (International Backbone)

Keywords

• Research network infrastructure
• High-performance networking
• University connectivity services
• Internet2 access
• Fiber optic peering

Headquarters

HQ city

Atlanta

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Infrastructure, Operations, Technology or R&D

Revenue model

1. Research Network Services: Provides cooperative research network infrastructure services to member universities and research institutions, offering cost-effective ISP services and access to high-performance computing networks through its membership in The Quilt consortium.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Southern Light Rail (SLR) operates the Southern Crossroads (SoX) network platform, providing high-bandwidth, low-latency fiber-optic connectivity and direct peering to Internet2 and ESnet for Georgia Research Alliance universities and other research institutions in the Southeastern United States. Through its 56 Marietta co-location facility in downtown Atlanta, SLR delivers more than 200 Gb/s of access capacity and manages dark fiber point-to-point deployments for member institutions.

Product overview

Southern Light Rail (SLR) is a Georgia Tech non-profit corporation providing high-performance networking infrastructure. The company's primary offering is Southern Crossroads (SoX), which provides network access and peering services to the research and education community. SoX delivers access to Internet2 and ESnet networks, along with peering opportunities at the 56 Marietta co-location site in Atlanta, supporting over 200Gb/s of connectivity for southeastern universities and research institutions.

Differentiator

Problem solved

Functional benefit

Products and services

• Southern Crossroads (SoX) Network Platform SLR's flagship network platform providing high-bandwidth, low-latency connectivity and network peering services to research and education institutions in the Southeastern United States, offering more than 200 Gb/s of access to Internet2 and ESnet from the 56 Marietta co-location site in Atlanta. Target customers are Southeastern universities, federal research agencies, and private sector research organizations.
• SLR Dark Fiber Infrastructure (project NS9294) Point-to-point dark fiber deployments for research and education connectivity, including single-entry configurations with 8 strands of dark fiber (2 strands for each connection from the A-location to each of four Z-locations). Procured through a public RFP for member institution connectivity.

Quantifiable outcome

• More than 200 Gb/s access to Internet2 and ESnet

Named customers22 records

Segments3 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Six partnerships are on record, tiered core.

• Georgia Institute of TechnologycoreStrategic or Co-development PartnerSLR is an affiliated non-profit corporation of Georgia Tech. Managed through a co-operative research contract with the Office of Information Technology (OIT) at Georgia Tech, which provides engineering and financial support for the region's universities.
• Internet2coreTechnology or IntegrationSLR provides more than 200Gb/s of access to Internet2 for the southeast region. 56 Marietta co-location site enables direct peering with Internet2.
• ESnetcoreTechnology or IntegrationSLR provides access to ESnet (Energy Sciences Network) for the southeast region, complementing Internet2 connectivity.
• The Quilt ConsortiumcoreStrategic or Co-development PartnerSLR is a member of The Quilt consortium, which enables extremely cost-effective ISP services to participants through collective purchasing and资源共享.
• National Lambda Rail (NLR)coreTechnology or IntegrationSLR provides National Lambda Rail access to Georgia Research Alliance universities, other universities in the Southern region, and governmental and private sector organizations involved in university research initiatives.
• Georgia Research AlliancecoreStrategic or Co-development PartnerSLR provides NLR access specifically to Georgia Research Alliance universities as a core part of its mission.

Scale indicators3 records

Recent moves7 records

Expansion highlights4 records

Direct peers

• NYSERNet: New York State Education and Research Network, a non-profit regional R&E network providing high-performance connectivity to universities and research institutions. NYSERNet operates a structurally similar model to SLR, including member institutions, dark fiber, and Internet2 peering.
• CENIC (Corporation for Education Network Initiatives in California): California's non-profit R&E network providing high-bandwidth, low-latency connectivity to universities, research institutions, and schools. CENIC's California Research and Education Network (CalREN) is functionally equivalent to SLR's SoX in serving research and education communities.
• MCNC: North Carolina-based non-profit operating NCREN (North Carolina Research and Education Network) for universities, schools, and research institutions. MCNC's regional R&E network model closely mirrors SLR's structure and member-cooperative economics.
• Great Plains Network (GPN): Regional consortium serving universities across the Great Plains states with high-performance research networking. GPN is a directly comparable cooperative research network with member-based economics and Internet2 connectivity similar to SLR.
• Florida Lambda Rail: Florida's regional research and education network providing high-bandwidth connectivity to universities and research institutions. SLR explicitly lists FLR as a Network Peer participant in its ecosystem, and the two organizations serve comparable functions for their respective state footprints.
• LEARN (Lonestar Education and Research Network): Texas-based regional R&E network serving universities and research institutions across the state. LEARN is a directly comparable cooperative research network with similar dark fiber, peering, and Internet2 access offerings to SLR's SoX platform.
• Mid-Atlantic Research Infrastructure Alliance (MARIA): Mid-Atlantic regional R&E network serving member institutions across multiple states. MARIA is explicitly identified as a Network Peer of SLR, making it a directly comparable regional aggregation peer with similar cooperative operating model.

Broad incumbents

• Internet2: National non-profit computer networking consortium for U.S. research and education. Internet2 is SLR's core upstream provider and a peer in the R&E networking category, but operates at much greater national scale and provides the backbone to which SLR connects members.
• ESnet (Energy Sciences Network): Department of Energy-funded national research network serving DOE national laboratories and the broader scientific community. ESnet is a core upstream network for SLR and a broad incumbent in the research networking space with comparable peering and high-bandwidth capabilities.

Others

• The Quilt: Consortium of regional research and education networking organizations in the U.S. The Quilt is a strategic consortium partner of SLR — SLR is a member — and is thematically adjacent as the collective vehicle through which regional networks coordinate procurement and policy.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Southern Light Rail