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PA-8T-X21
Model:Cisco 7200 Series 8-Port Serial, X.21 Port Adapter
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PA-8T-X21 is a high-performance 10Gbps Ethernet module designed for seamless integration into routers, switches, and servers. It features a robust SFP+ connector that supports high-speed data transfers while conforming to essential protocols such as TCP/IP and iSCSI. Its PCIe form factor ensures effortless installation in modern data centers and enterprise networks.
Engineered for expanding data center capacity and upgrading network interfaces, PA-8T-X21 offers outstanding compatibility with leading vendors like Cisco, Juniper, Dell, and HP. This module provides advanced features including auto-negotiation, jumbo frames, and QoS, making it an ideal solution for connecting to high-speed networks while achieving optimized performance and energy efficiency.
PA-8T-X21 price is $3,156.35, a 61% saving from the Cisco list price of $8,093.20. PA-8T-X21 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for PA-8T-X21 for additional pricing. Browse the full Cisco 7200 Modules series or explore all Cisco products.
A telecom enterprise leverages the PA-8T-X21-Model:Cisco 7200 Series 8-Port Serial, X.21 Port Adapter to consolidate multiple X.21 leased lines across heterogeneous routers. By standardizing on Cisco 7200 Series hardware, the network achieves seamless multi-carrier WAN integration, reduces operational complexity, and lowers recurring circuit costs through centralized provisioning and enhanced line utilization.
A global financial institution deploys the PA-8T-X21-Model:Cisco 7200 Series 8-Port Serial, X.21 Port Adapter as a redundant trading-floor backup link over X.21 circuits. Automated failover across eight serial ports ensures sub-30 ms switchover, maintaining ultra-low latency and regulatory compliance for mission-critical market data feeds.
An energy utility implements the PA-8T-X21-Model:Cisco 7200 Series 8-Port Serial, X.21 Port Adapter to aggregate remote SCADA RTU telemetry over secure X.21 channels. Centralized serial connectivity enhances operational visibility, boosts fault tolerance for remote-site equipment, and streamlines maintenance through uniform Cisco IOS management.
To get the detailed certification, please go to the Compliance Center.
| PA-8T-X21 |  C7200-VSA |  PA-POS-2OC3 |  PA-8T-V35 |  PA-MC-E3 | |
|---|---|---|---|---|---|
| Product Type | Network Module / Network Card | Network Module | Network Module | Network Card | Network Card |
| Module Type | Ethernet | Ethernet Module | Ethernet | Ethernet | Ethernet |
| Data Rate | 10G | 1Gbps | 10Gbps | 10G | 10G |
| Connector Type | SFP+ | RJ-45 | SFP+ | SFP+ | SFP+ |
| Supported Protocols | TCP/IP / iSCSI | TCP/IP, iSCSI | TCP/IP, iSCSI | TCP/IP, iSCSI | TCP/IP |
| Form Factor | PCIe | Modular | PCIe | PCIe | PCIe |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | Cisco / Juniper / Dell / HP | Cisco 7200 Series Routers, Cisco Switches | Cisco, Juniper, Arista, Dell, HP | Cisco, Juniper, Arista, Dell, HP | Cisco, Juniper, Arista, Dell, HP |
| Max Speed | 10Gbps | 1Gbps | 10Gbps | 10Gbps | 10Gbps |
| Supported Features | Auto-negotiation / Jumbo Frames / QoS | Auto-negotiation, Jumbo Frames | Auto-negotiation, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation, Jumbo Frames, QoS |
| Power Consumption | 8W | N/A | 5W | 15W | 12W |
| Interface Ports | Ethernet | Ethernet | SFP+ | SFP+ | SFP+ |
| Expansion Slots | N/A | NIM | N/A | N/A | PCIe |
| Product Name | PA-8T-X21 10Gbps Ethernet Module | Cisco C7200-VSA | PA-POS-2OC3 High-Speed Ethernet Module | PA-8T-V35 | PA-MC-E3 High-Performance Ethernet Module |
| Height | N/A | N/A | 0.5 inches | N/A | 1.73 inches |
| Width | N/A | N/A | 3.5 inches | N/A | 4.19 inches |
| Depth | N/A | N/A | 5 inches | N/A | 0.75 inches |
| Weight | N/A | N/A | 1.2 lbs | N/A | 0.5 lbs |
The PA-8T-X21 module has greatly improved our network's performance. It supports 8 X.21 serial connections and ensures reliable, high-speed data transfer.
This module offers exceptional reliability. The PA-8T-X21 supports multiple X.21 connections, ensuring fast and stable communication across our network.
The PA-8T-X21 is perfect for handling multiple connections. It provides reliable performance for our network and supports stable data transfer.
We use the PA-8T-X21 module for its stable and fast performance. It supports 8 X.21 serial connections, making it ideal for high-demand environments.
The PA-8T-X21 module provides solid X.21 serial support. It ensures reliable data transfer and is easy to integrate into our network setup.
The PA-8T-X21 is a high-density interface module for Cisco 7200 Series routers providing eight X.21 ports for reliable WAN connectivity.
The PA-8T-X21 is fully compatible with Cisco 7200 Series routers, including models 7201, 7202, and their variants.
It features eight X.21 DCE/DTE ports, supports data rates from 64 kbps to 2.048 Mbps, and requires a single 64-bit PCI slot.
Power down the router, insert the PA-8T-X21 into an available interface slot until it clicks, then secure the module and power up the router.
The adapter supports standard X.21 cables with DB-15 male connectors for both DCE and DTE configurations.
The PA-8T-X21 supports synchronous X.21 connections exclusively; asynchronous serial operation is not supported.
It supports line speeds from 64 kbps up to 2.048 Mbps per port to accommodate common WAN requirements.
In global configuration mode, use interface x21 <slot>/<port>, set clock rate if DCE, define encapsulation, and apply no shutdown.
Typical use cases include connecting to public data networks, leased-line services, and legacy telecom infrastructures.
Yes, the PA-8T-X21 is hot-swappable in supported Cisco 7200 Series routers running an IOS release that supports online insertion and removal.
Use the CLI command show interfaces x21 <slot>/<port> and check the port status LEDs for link and activity indicators.
Cisco IOS Release 12.0(5)T or later with the desired feature set (IP, Advanced IP Services) is required for full adapter support.
Verify cable integrity, check clocking settings with show controllers x21, review interface errors, and update to the latest IOS.
The module comes with a one-year limited hardware warranty and optional Cisco SMARTnet® services for enhanced support.
You can buy the PA-8T-X21 through authorized Cisco resellers; pricing typically ranges from USD 500 to USD 1,500 depending on contract terms.
No additional hardware licensing is required beyond the router’s IOS feature set, though advanced features may need corresponding software licenses.