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Key Technical Specifications
| Parameter | Value |
|---|---|
| Forwarding Capacity | 20 Gbps wire-speed |
| Architecture | dCEF720-based |
| MDA Support | Multiple Media Dependent Adapters (Ethernet, POS, ATM, etc.) |
| Hot-Swap | Supported |
| Platform Compatibility | Alcatel-Lucent / Nokia 7750 SR series |
| Redundancy | Supports system-level redundancy |
| Typical Interfaces (via MDA) | 1/10 Gigabit Ethernet, POS, ATM |
| Service Support | MPLS, VPLS, Layer 3 routing, QoS, full carrier services |
| Form Factor | Chassis line-card slot |
| Operating Environment | Carrier-grade, 7×24 continuous operation |
4. Product Introduction
The Alcatel IOM2-20G (3HE00020AB) is a 20 Gbps Input/Output Module designed for the 7750 Service Router platform. It serves as the core packet-forwarding engine and hosts Media Dependent Adapter (MDA) cards that provide the physical interfaces.
Built on the dCEF720 architecture, the module delivers wire-speed forwarding while supporting the full suite of carrier services including MPLS VPN, VPLS, Layer 3 routing, and advanced QoS. It is hot-swappable and engineered for continuous carrier-grade operation. Always verify exact chassis slot compatibility, software release, and required MDA types against the running system configuration before installation.
IOM2-20G
IOM2-20G
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Module not recognized / no power LEDs | Slot power fault or improper seating | ✅ High | Reseat module firmly; check chassis power and slot status LEDs | Confirm chassis power and slot enablement; replace module if LEDs remain dark |
| MDA not detected or interface down | Incompatible or faulty MDA, seating issue | ✅ High | Verify MDA type compatibility and reseat both IOM and MDA | Match MDA to supported list for this IOM revision; test with known-good MDA |
| Partial forwarding / high drop rates | Over-subscription or fabric congestion | ✅ Medium | Check interface statistics and fabric utilization via CLI | Review traffic engineering and QoS configuration; confirm 20 Gbps capacity limits |
| Module fails after software upgrade | Incompatible software release | ✅ High | Compare running software version against IOM support matrix | Load compatible SR OS release; contact support with version details |
| Intermittent resets or alarms | Thermal or power anomaly | ✅ Medium | Monitor temperature sensors and power draw via management system | Ensure adequate chassis cooling and power budget; clean air filters |
| System boots but services fail on this slot | Configuration or licensing issue | ❌ Low | Check card configuration and feature licenses | Problem is usually configuration or license related, not the hardware itself |
If diagnostics remain inconclusive, capture the full “show card” and “show log” output, note the exact revision markings, and contact technical support with chassis serial and software version.
6. Frequently Asked Questions (FAQ)
Q: Is this unit new original or refurbished?
A: New Original / New Surplus. Units undergo visual inspection, power-on self-test, and basic MDA recognition checks. Test reports and photos are available on request.
Q: What does the “20G” in IOM2-20G mean?
A: It indicates 20 Gbps aggregate wire-speed forwarding capacity for the module. Actual usable bandwidth depends on the installed MDAs and traffic patterns.
Q: Which chassis does the Alcatel IOM2-20G fit?
A: It is designed for the Alcatel-Lucent / Nokia 7750 SR series. Confirm exact chassis model (SR-7, SR-12, etc.) and software release compatibility before ordering.
Q: Can I hot-swap this module?
A: Yes. The IOM2-20G supports hot-swap. Follow the proper removal/insertion sequence and allow the system to complete diagnostics after insertion.
Q: What MDAs are supported?
A: A wide range of Media Dependent Adapters for Gigabit/10-Gigabit Ethernet, POS, ATM, and other interfaces. Compatibility depends on the specific IOM revision and SR OS software level. Always verify the MDA against the official support matrix.
Q: Is this the same as newer IOM2-se or higher-capacity modules?
A: No. The IOM2-20G is an earlier 20 Gbps generation. Newer FP-based modules (-se and later) offer significantly higher capacity and different silicon. They are not drop-in replacements without chassis and software validation.
Q: What should I check before installing a replacement?
A: Photograph the existing module’s part number, revision, and any labels. Confirm chassis slot type, current SR OS version, and the exact MDA types required. Ensure the power and cooling budget can support the module. Match the software support matrix exactly.
