The Transmission Method Decision Behind Every Trading Relationship
Every B2B EDI integration relies on a transmission method to move transactions between you and your trading partners. The two dominant approaches — Value-Added Networks (VANs) and direct connections like AS2 — carry meaningfully different cost, control, and reliability trade-offs.
What Is a VAN?
A Value-Added Network acts as a intermediary, receiving transactions from senders and routing them to the correct recipient, similar to a postal service for EDI data.
VAN Advantages
- Single connection point for multiple trading partners, reducing setup complexity
- Built-in mailbox and audit trail for transaction tracking
- Vendor-managed infrastructure, reducing internal technical burden
VAN Trade-Offs
- Per-transaction or subscription fees that scale with volume
- Less direct control over transmission timing and troubleshooting
- Potential latency compared to direct connections
What Is a Direct Connection?
Direct connections, most commonly using the AS2 protocol, establish a point-to-point link between your system and a trading partner’s system without an intermediary network.
Direct Connection Advantages
- Lower per-transaction cost at scale, especially with high-volume partners
- Faster transmission with fewer intermediary hops
- Full visibility into connection status and troubleshooting
Direct Connection Trade-Offs
- Individual setup required per trading partner, increasing onboarding complexity
- Certificate and connectivity management falls on your internal team or EDI consulting services provider
- Less standardized than a VAN’s unified mailbox experience
VAN vs. Direct: A Side-by-Side Comparison
| Factor | VAN | Direct (AS2) |
|---|---|---|
| Setup Complexity | Lower, centralized | Higher, per-partner setup |
| Cost at Scale | Increases with volume | More cost-efficient at high volume |
| Transmission Speed | Slightly slower | Faster, fewer hops |
| Control & Visibility | Managed by VAN provider | Full internal visibility |
| Best Fit | Smaller partner networks, lower volume | High-volume partners, larger networks |
Choosing the Right Method for Your Trading Partners
When a VAN Makes Sense
Companies with a smaller number of trading partners, lower transaction volumes, or limited internal technical resources often find VANs simpler to manage, especially during initial trading partner onboarding.
When Direct Connections Make Sense
High-volume relationships — particularly with major retailers processing thousands of transactions monthly — often justify the setup investment of a direct AS2 connection given the long-term cost savings.
A Hybrid Approach Is Common
Many organizations use a VAN for smaller or occasional trading partners while establishing direct AS2 connections with their highest-volume relationships — balancing simplicity against cost efficiency where it matters most. This mirrors the same layered thinking behind maintaining strong EDI disaster recovery planning: redundancy and flexibility protect order flow regardless of which method a given partner uses.
Not Sure Which Transmission Method Fits Your Network?
Our EDI consulting services team can evaluate your trading partner mix and recommend the right combination of VAN and direct connections. Contact us today for a transmission strategy assessment.
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