Cisco PA-E3 Cisco 7200/7600 Port Adapter

Brand: Cisco | Category: Accessories & Components

SKU: CSC-PA-E3 | Part #: PA-E3 | MPN: PA-E3

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The Cisco PA-E3 port adapter extends the WAN connectivity of Cisco 7200 and 7600 series routers by adding native E3 interface support, enabling organizations to connect directly to E3 circuits operating at 34.368 Mbps. For network engineers managing multiprotocol backbone infrastructure across distributed data centres or enterprises with legacy carrier circuits, this adapter bridges aging but still-prevalent telecommunications standards to modern routing platforms. The addition of an E3 port expands the functional scope of an existing chassis investment without requiring a complete platform refresh—a practical consideration for organizations running mixed-generation networks across GCC and Southeast Asian operations.

Cisco engineered the PA-E3 to handle both framed and unframed E3 signalling, adhering to ITU-T G.703 and G.751 standards that remain fundamental to international carrier infrastructure. The adapter accepts either internal or external clock sources, giving network operators flexibility in synchronization architecture—critical when integrating with legacy TDM circuits where clock stability directly affects payload integrity. With a single BNC connector, the PA-E3 occupies minimal physical space within a port slot, allowing data centre managers and WAN architects to maximize port density on shared chassis platforms. The component is genuine Cisco hardware, which means it qualifies for Cisco Technical Assistance Center (TAC) support validation, a requirement many enterprises enforce when handling production backbone connectivity.

Installing the PA-E3 into a Cisco 7200 or 7600 series router is straightforward for experienced network teams, as both platforms feature standardized port adapter slots that accept this form factor without requiring software modifications or firmware updates beyond standard image maintenance. The integration preserves existing configuration workflows and monitoring capabilities native to Cisco IOS, meaning your operations team does not face a learning curve or new management discipline. E3 circuits themselves are common in European, Middle Eastern, and Asian telecom ecosystems, particularly in legacy financial services networks, government agency communications, and carrier backbone rings where older TDM infrastructure remains contractually locked or operationally entrenched. The PA-E3 thus serves as a cost-effective retention mechanism—keeping proven 7200/7600 platforms in service rather than forcing costly mid-life platform replacement simply to support a single circuit type.

Network engineers responsible for WAN infrastructure modernization or circuit consolidation projects often encounter E3 adapters as essential fill-in components when migrating from older dedicated routers into consolidated, higher-density chassis environments. Rather than decommission a working E3 circuit ahead of schedule or maintain a standalone router for a single interface, the PA-E3 allows that circuit to merge into a shared platform, improving resource utilization and reducing operational overhead. The adapter's support for both internal and external clocking also means it integrates seamlessly into synchronization hierarchies where precise timing flows from a central atomic clock or carrier-supplied timing signal—typical in service provider and large financial institution networks operating synchronized TDM backbones.

Omnixon Global maintains a specialized inventory of Cisco port adapters and WAN interface modules, including the PA-E3, to support enterprises and service providers across the GCC, India, Southeast Asia, and Europe. Whether you are consolidating legacy WAN circuits, expanding existing 7200/7600 deployments, or building replacement backbone capacity, we can supply genuine Cisco hardware with full TAC eligibility and transparent lead times. Contact our sales team to discuss your interface requirements and request a quotation for the Cisco PA-E3 or related port adapter solutions.

Interface & Connectivity Specifications

• E3 port adapter for Cisco 7200 and 7600 series routers; supports 34.368 Mbps line rate
• Framed (G.751) and unframed E3 signalling modes; compliant with ITU-T G.703 and G.751 standards
• Single BNC connector interface; internal or external clock source selection
• Cisco part number PA-E3; genuine hardware eligible for Cisco TAC support
• Compact port adapter form factor; installs into standard port slots without chassis modifications
• Integrates with existing Cisco IOS configuration and monitoring toolsets
• Suitable for legacy TDM backbone circuits, financial services networks, and carrier infrastructure environments