Cisco ASR5K-042GE-LX-K9= Rev2 Four-Port QGLC with LX Single-Mode SFPs

ASR5K-042GE-LX-K9= QGLC Rev2 Identity

ASR5K-042GE-LX-K9= is Cisco's spare orderable form of the QGLC Rev2 four-port Ethernet 1000 card with LX single-mode long-haul SFP interfaces. The `042GE` PID is the revision marker; it should not be collapsed into the original `041GE` card simply because port density and optical medium match.

Revision-controlled procurement

Record the required Rev2 PID, hardware revision, chassis slot and StarOS release. Compare the installed card set and software support before introducing Rev2 into a legacy system. If replacing an original QGLC, obtain an approved compatibility and rollback plan rather than treating the revised hardware as an automatic drop-in.

Link-by-link commissioning

Create a four-row circuit schedule covering peer, VLAN or routed role, addressing, MTU, expected traffic and redundancy for every port. After installation, confirm all four interfaces enumerate correctly, establish link and carry the intended service. Review card-level and per-port counters before accepting the change.

Long-haul optical verification

Validate single-mode cabling, connector type and cleanliness, link length, loss budget and the peer's compatible LX interface. Preserve transmit/receive optical readings where available and investigate marginal levels or errors. The Rev2 designation does not convert LX into SX multimode or copper media.

Hardware and failover acceptance

Capture UDI PID, version, serial, operational state, usability and programmable status. Exercise the intended redundant path or card-recovery procedure and verify that no neighboring service is disrupted. Save before/after inventory, configuration, optical data, traffic counters and alarms.

Lifecycle and orderable scope

The `=` suffix denotes the spare PID. Cisco includes ASR5K-042GE-LX-K9= in its ASR 5000 end-of-sale/end-of-life material. This SKU supplies one Rev2 QGLC in the documented LX form; it includes no original 041GE card, chassis, cabling, software entitlement, support or migration work.

Official Cisco sources: Exact Rev2 QGLC spare PID and LX description, QGLC revision and installation reference and Card identity and operational diagnostics.