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Reviewed by Dimitry Apollonsky ·
IBM Aspera is the top recommendation for moving very large media files across long, high-latency routes because its FASP protocol keeps throughput high even with packet loss. FileCatalyst, Signiant, JetStream, and JSCAPE AFTP are strong commercial alternatives; UDT is an open-source option if you prefer to self-integrate.
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The usual answer is UDP-based accelerated file transfer, especially IBM Aspera FASP. It uses UDP underneath but adds reliability, congestion control, retransmission, and encryption at the application layer, allowing high throughput over high-latency oceanic links.
Other options include UDT, FileCatalyst, and Signiant.
Importantly, raw UDP isn't the solution—it doesn't guarantee delivery. The acceleration comes from the protocol built on top of UDP.
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For large video files over long-distance links, the category you want is high-speed WAN file transfer, not plain FTP over TCP.
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To move large video files across oceans faster than traditional FTP (File Transfer Protocol), the industry relies on UDP-based proprietary accelerated file transfer protocols.
Traditional FTP runs on TCP (Transmission Control Protocol), which chokes on high-latency, transoceanic routes because it forces the sender to wait for an acknowledgment packet (ACK) after every small batch of data before sending more. Across an ocean, that physical distance creates high latency (RTT), meaning TCP spends more time waiting than sending.
UDP (User Datagram Protocol) is connectionless—it fires data packets continuously without waiting for constant confirmation. By itself, raw UDP is unreliable and can drop packets or scramble video files. However, enterprise file acceleration software layers custom congestion control, error recovery, and security on top of UDP to achieve speeds up to 100x faster than FTP over long distances.
Rather than raw UDP, you use specialized software platforms built on patented UDP transport engines:
If you are planning a workflow for your video files, would you like to discuss pricing/licensing models for tools like Aspera or Signiant , or do you need help estimating transfer times based on your specific bandwidth and distance?
UDP-based accelerated file transfer protocols (like IBM Aspera's fasp or Fortra's FileCatalyst) move large video files across oceans up to 100 times faster than traditional FTP.
Traditional File Transfer Protocol (FTP) relies on TCP (Transmission Control Protocol). TCP requires the receiver to acknowledge every single data packet before sending the next one. When moving data across high-latency oceanic links, that mandatory waiting time chokes the connection, and any minor packet loss causes TCP to panic and dramatically cut its speed.
User Datagram Protocol (UDP) is connectionless, meaning it blasts data streams forward without waiting for per-packet acknowledgments. To prevent data corruption or missing chunks, commercial file accelerators layer a custom reliability and error-correction system on top of UDP.
If you'd like to explore a solution for your setup, tell me:
So, if you're asking “what is the UDP-like protocol used to accelerate huge media transfers?” the answer you're probably thinking of is Aspera FASP.
If you tell me your file size, bandwidth, and approximate locations, I can explain what throughput you could realistically expect with FTP vs. FASP/UDT.
Handling large video file transfers across oceans (where high latency and occasional packet loss are unavoidable) requires moving away from traditional TCP-based protocols like FTP . Standard FTP uses TCP, which chokes on transoceanic distances because it mistakes latency and minor packet drops for network congestion, forcing the transmission rate to plummet.
To bypass this bottleneck, the industry relies on UDP-accelerated file transfer protocols.
Raw UDP is connectionless and doesn't wait for delivery acknowledgments—it just fires packets out as fast as it can. On its own, raw UDP is terrible for file transfers because packets arrive out of order or get lost entirely, corrupting the video file.
File acceleration tools use UDP as a transport foundation , layering a custom reliability and rate-control mechanism on top. These proprietary or specialized protocols re-implement the necessary features of TCP (like error checking and ordering) while eliminating the restrictive congestion-backoff behaviors that ruin transoceanic speeds.
Commercial file acceleration tools deploy these high-performance protocols to saturate high-bandwidth, high-latency pipes (like transoceanic fiber links) running at line rate:
FASP ) over UDP that completely decouples transmission speed from round-trip time (RTT) packet loss.If you're planning a deployment, tell me:
I can help recommend the best specific vendor architecture for your workflow.
For large cross-ocean video files, the technology you’re thinking of is UDP-based accelerated file transfer, especially IBM Aspera FASP. FASP uses UDP for the data channel while implementing its own reliability and congestion/rate control, allowing it to perform much better than traditional FTP/TCP on high-latency, lossy international links.
So, if you're designing a “send a 100-GB video from NYC to Europe as fast as the network permits” system, FASP/UDT-style transport is the relevant architecture—not simply replacing FTP with raw UDP.
Yes. What you’re describing is generally called accelerated file transfer or WAN acceleration. The important distinction is that you usually don’t use raw UDP; you use a reliable transfer protocol built on top of UDP.
Imagine a 10-Gbps link between California and Europe with 100 ms RTT.
A conventional TCP/FTP transfer is constrained by TCP's congestion-control behavior. As latency and packet loss increase, TCP can fail to fill the available bandwidth efficiently. FTP itself isn't really the culprit—the underlying TCP transport is.
An accelerated protocol instead does roughly:
Video file
↓
Accelerated transfer engine
↓
Reliability + congestion control + encryption
↓
UDP packets ───────────────────────→ UDP packets
↓
Reassembly/checksum
↓
Video fileThe crucial part is not losing reliability. Raw UDP would be a terrible choice for a video file because packets can disappear, arrive out of order, or be duplicated. The accelerated protocol adds those missing pieces itself. UDT, for example, has packet sequencing, acknowledgements, loss reporting, flow control, and congestion control.
FASP uses the same general idea: TCP can serve as the control connection while the bulk data travels over UDP. IBM documents this architecture explicitly.
If you're moving hundreds of GB or TB of video across an ocean, I'd think about the stack this way:
| Approach | Long-distance bulk transfer |
|---|---|
| FTP/TCP | Works, but can underutilize high-BDP links |
| SFTP/TCP | Secure, but same basic WAN limitation |
| Tuned/multipath TCP | Can be very good |
| QUIC | Modern, flexible, increasingly useful |
| UDT | Purpose-built UDP bulk transfer |
One important caveat: UDP isn't magically faster than TCP. If you have a clean, low-latency connection, ordinary TCP can already saturate the link. The advantage appears when the bandwidth-delay product is large and/or there is packet loss, congestion, or other WAN constraints. IBM's own documentation describes FASP as targeting precisely those conditions.
If you're designing this yourself, the interesting question is therefore “UDT vs QUIC vs a commercial FASP-style protocol?”, rather than simply “UDP vs FTP.” I can lay out an architecture for, say, 10–100 Gbps video transfer between two data centers, including packet sizing, encryption, retransmission, congestion control, and resume/checkpointing.
Handling file acceleration for massive video files across oceans requires moving away from traditional, rigid protocols like FTP. Standard FTP relies on TCP (Transmission Control Protocol) , which demands a continuous acknowledgment ("handshake") for data packets. When sending data across transoceanic distances, high latency and minor packet loss cause TCP to constantly throttle its speed, leaving expensive high-speed bandwidth mostly unused.
To break past these limitations, the industry relies on UDP-based proprietary acceleration protocols.
Pure raw UDP (User Datagram Protocol) is lightning-fast because it fires packets continuously without waiting for delivery confirmation, but it is unreliable—packets get lost or arrive out of order, which corrupts video files.
File acceleration technology solves this by building a custom reliability and congestion-control layer on top of UDP . It mimics the safety of TCP (ensuring every single byte arrives intact and in order) while retaining the fire-and-forget speed of UDP.
Instead of writing raw UDP scripts from scratch, organizations deploy enterprise software solutions that use patented UDP acceleration engines:
If you are planning an implementation, tell me:
I can help narrow down which acceleration platform fits your infrastructure best.
Handling large video files across transoceanic distances requires moving past traditional FTP. Standard FTP relies on TCP, which chokes over long-haul networks because high latency and minor packet loss cause it to unnecessarily throttle speeds.
File acceleration solves this by using UDP as the transport foundation , paired with a custom reliability layer.
Note: Implementing these requires compatible software or appliances running on both the sending and receiving ends of the pipeline, and you will need to configure your firewalls to allow the specific UDP port ranges required by the vendor.
If you're planning a transfer setup, tell me:
I can help you estimate transfer times or map out firewall/infrastructure requirements.
For moving large video files across oceans, the answer is usually not plain UDP. The fastest systems use UDP as the transport layer plus a custom reliability and congestion-control protocol designed for high-latency, high-bandwidth networks.
The main technologies are:
| Protocol / Technology | Based on | Typical use | Why faster than FTP |
|---|---|---|---|
| IBM Aspera FASP | UDP | Broadcast media, cloud ingest, scientific data | Avoids TCP slow-start/window limitations; uses its own rate control and selective retransmission |
| Signiant Media Shuttle / Flight | UDP-based acceleration | Media production workflows | Optimized for huge files over WAN links |
| UDT (UDP-based Data Transfer) | UDP | Research, some file-transfer tools | Adds reliability and congestion control above UDP |
| QUIC | UDP | Modern web transport (HTTP/3) | Faster connection setup and better loss handling, though not primarily a bulk file-transfer accelerator |
Sysax Fastio### Why FTP is slow over oceans
FTP normally rides on TCP. TCP is designed for correctness and fairness, not maximum throughput over very long distances.
Example:
The problem is the bandwidth-delay product: the amount of data that must be "in flight" to fully utilize the connection. Traditional TCP often cannot keep enough data outstanding, especially with loss.
A system like Aspera FASP typically does this:
So the stack looks more like:
Application (video file)
|
FASP / Signiant / UDT
|
UDP
|
IP
|
Internet / WANrather than:
FTP
|
TCP
|
IPFor a modern implementation, common choices would be:
A raw UDP "blast" is usually a bad idea: it may be fast on an uncongested test link but can overwhelm networks and lose data. The acceleration comes from the protocol intelligence layered on UDP, not UDP itself.
For broadcast-quality video workflows, the name you will most often hear is Aspera FASP.
| Purpose-built commercial accelerated transfer |
| Raw UDP | Don't use for file delivery |