T1 / E1 / J1 spansIntegrated carrier trunk accessUse D-series cards when T1, E1, or J1 carrier trunks should terminate directly inside the PBX server.
Carrier Trunking Built into PBX Servers
OpenVox Digital Cards give a standard PCIe server direct E1, T1, and J1 trunk access for Asterisk-based PBX deployments. By bringing carrier PRI, SS7, R2, or legacy PBX trunks inside the chassis, the server gains high-capacity voice interconnect, centralized call control, and a cleaner integrated architecture without an external digital gateway.
- Interfaces
- T1 / E1 / J1
- Expansion
- PCIe Digital Card
- Range
- 1 to 16 Ports
Define digital trunk requirements
Specify the delivered trunk type, signaling mode, required span count, and expected concurrent calls before selecting a D-series card. This gives the PBX server the right trunk capacity without adding an external gateway layer.
- Confirm whether the carrier or upstream PBX presents T1, E1, or J1 service.
- Match PRI, SS7, R2, or line signaling requirements to the PBX software environment.
- Select D130, D230, D430, D830, or D1630E by span count and channel capacity.
Check span density and server fit
Confirm the selected span density, host slot, operating system, DAHDI support, power availability, and optional hardware echo cancellation before finalizing the PBX server configuration.
T1 / E1 / J1 spansIntegrated carrier trunk access
D130 to D1630E density1 to 16 spansSelect the model by span count, then confirm channel capacity, framing, and signaling with the carrier or upstream PBX.
PCIe host interfaceModern motherboard defaultUse PCIe for current server boards; choose PCI only for older PCI-only platforms.
Card power connectorPower input confirmationCheck card power input and available server leads before finalizing the configuration.
HWEC hardware echo cancellationHardware DSP echo processingAdd HWEC when the deployment needs dedicated echo handling on the card.
Choose the D-series density tier
Choose D130, D230, D430, D830, or D1630E according to the number of T1, E1, or J1 spans the server must terminate. Lower-density models suit compact PRI access, while D830 and D1630E support larger multi-span trunk consolidation.
Digital card model
D130
Single-span D-series card for compact PRI or legacy trunk access inside a PBX server.
- Capacity tier
- Entry digital card
- Span capacity
- 1 span
- Interface
- T1 / E1 / J1
- Best fit
- Compact PRI deployment
Digital card model
D230
Two-span D-series card for PBX servers that need more capacity than a single carrier span.
- Capacity tier
- Small digital card
- Span capacity
- 2 spans
- Interface
- T1 / E1 / J1
- Best fit
- Small carrier interconnect
Digital card model
D430
Four-span D-series card for consolidating multiple digital trunks in one PBX server.
- Capacity tier
- Mid-density digital card
- Span capacity
- 4 spans
- Interface
- T1 / E1 / J1
- Best fit
- Multi-span trunk consolidation
Digital card model
D830
Eight-span D-series card for high-channel carrier interconnect and larger PBX systems.
- Capacity tier
- High-density digital card
- Span capacity
- 8 spans
- Interface
- T1 / E1 / J1
- Best fit
- High-channel PBX server
Digital card model
D1630E
Sixteen-span D-series card for large digital trunk consolidation inside a single PBX server.
- Capacity tier
- Highest-density digital card
- Span capacity
- 16 spans
- Interface
- T1 / E1 / J1
- Best fit
- Large multi-span deployment
Match digital trunk needs to a card
Compare the trunk role, signaling requirement, span capacity, and server fit to select the D-series card that matches the PBX deployment.
| Specification | D130 | D230 | D430 | D830 | D1630E |
|---|---|---|---|---|---|
| Digital trunk basics | |||||
| Use case | Use Digital Cards when T1, E1, or J1 trunks should terminate directly inside the PBX server instead of an external gateway. | ||||
| Trunk protocol | Confirm whether the carrier or upstream PBX delivers T1, E1, or J1 service before choosing the model. | ||||
| Signaling mode | Confirm PRI, SS7, R2, or other required line signaling with the carrier or upstream PBX. | ||||
| Model-by-model selection | |||||
| Span capacity | 1 span | 2 spans | 4 spans | 8 spans | 16 spans |
| Interface | T1 / E1 / J1 | T1 / E1 / J1 | T1 / E1 / J1 | T1 / E1 / J1 | T1 / E1 / J1 |
| Best fit | Compact PRI deployment | Small carrier interconnect | Multi-span trunk consolidation | High-channel PBX server | Large multi-span deployment |
| Capacity planning | Match single-span service | Support two-span service | Consolidate four spans | Scale to eight spans | Use for the highest listed density |
| Configuration confirmation | |||||
| Server platform | Confirm the host slot, card revision, operating system, DAHDI support, and available power for the target PBX server. | ||||
| Quotation details | Share the trunk type, signaling mode, span count, channel target, server details, and preferred D-series model for quotation confirmation. | ||||
Use Digital Cards for integrated trunks
Digital Cards are designed for PBX servers that terminate T1, E1, or J1 trunks inside the chassis. If the site needs analog endpoints, S/T BRI access, mixed interface modules, or standalone gateway operation, choose the matching OpenVox product family.
Direct trunk chassis deployment
- The PBX host terminates T1, E1, or J1 spans inside the server chassis.
- The team owns PRI, SS7, R2, and driver planning on the host.
- The build is centered on carrier trunk access, not endpoint adaptation.
Dedicated analog card alternative
- The site needs FXS or FXO line access rather than digital spans.
- Phones, fax devices, or PSTN lines should terminate on analog modules.
- The requirement belongs to the analog card family.
BRI card alternative
- The access side is S/T BRI rather than T1, E1, or J1.
- The project is sized around ISDN circuit density, not trunk spans.
- The requirement belongs to the BRI card family.
Hybrid card alternative
- The chassis needs digital plus analog or BRI modules.
- One modular host should carry more than one interface family.
- A mixed-interface build is more appropriate than a pure digital card.
Get a Digital Trunk Card Quote
Send the T1/E1/J1 trunk type, signaling mode, span count, channel target, server slot, operating system, Asterisk version, and DAHDI version. OpenVox can confirm the suitable D-series model and prepare a quotation for the PBX build.