MikroTik XQ+31LC10D 100G QSFP28 LR4 10km SMF Module

The MikroTik XQ+31LC10D is a 100G QSFP28 single-mode fiber transceiver designed for the 10km inter-site connections that MikroTik's 100G switch and router platform makes possible — the optical module that turns a QSFP28 port on a CRS504-4XQ-OUT, CRS510-8XS-2XQ-IN, CRS518-16XS-2XQ-IN, or CCR2216 into a 10km 100G single-mode fiber link.

**4× 25G WDM channels — how 100G travels 10km on a single SMF pair**

The XQ+31LC10D implements 100GBASE-LR4 — four independent 25G full-duplex optical channels on four separate wavelengths (1296nm, 1300nm, 1305nm, 1309nm), multiplexed onto a single-mode fiber pair via WDM (Wavelength Division Multiplexing). Each wavelength carries 25 Gbps independently — the four lanes aggregate to 100 Gbps full duplex. The Dual LC UPC connector connects to a standard OS2 single-mode fiber patch cord or pre-terminated fiber run. At 10km reach on OS2 SMF, the XQ+31LC10D covers the inter-building, campus, and tower-to-PoP distances that define ISP aggregation and enterprise campus deployments.

**Digital diagnostics — monitoring optical health in RouterOS**

The XQ+31LC10D includes built-in digital diagnostic monitoring (DDM/DOM) — reporting optical transmit power, received optical power, transceiver supply voltage, operating temperature, and per-channel laser bias current directly to the host switch or router. In RouterOS, these diagnostics are accessible via the interface monitoring commands — providing real-time optical link health without external test equipment. MikroTik explicitly highlights the value: "monitoring allows you to plan ahead, make informed decisions and predict necessary upgrades or maintenance based on the transceiver performance." A gradual decline in received optical power — indicating fiber degradation, connector contamination, or bend loss — is visible in RouterOS before the link fails, enabling proactive maintenance scheduling rather than reactive fault response.

**Compatible MikroTik QSFP28 platforms**

MikroTik explicitly lists the primary compatible devices on the product page: CCR2216, CRS504 (both -4XQ-IN and -4XQ-OUT variants), and CRS518-16XS-2XQ-IN. The CRS510-8XS-2XQ-IN's two QSFP28 ports are also compatible — confirmed by the shared 98DX4310 Prestera ASIC platform and standard QSFP28 electrical interface. Any third-party switch or router with a standard 100GBASE-LR4 compliant QSFP28 port is also compatible — the XQ+31LC10D adheres to the IEEE 802.3ba 100GBASE-LR4 standard.

**Deployment context — where the 10km SMF reach applies**

- **Tower-to-PoP 100G fiber backhaul:** A CRS504-4XQ-OUT at a tower site connected via XQ+31LC10D to a CRS518 or CCR2216 at the ISP's PoP — up to 10km on pre-existing single-mode fiber infrastructure.

- **Campus inter-building 100G links:** Two CRS510-8XS-2XQ-IN units in separate campus buildings connected via XQ+31LC10D transceivers and an OS2 fiber run — 100G inter-building bandwidth within a single campus.

- **Data centre inter-row or inter-suite 100G:** Distances within a data centre or between suites in the same building where DAC cables are too short and AOC cables are unnecessary — a clean OS2 SMF patch cord with XQ+31LC10D at each end.

**Cross-sell note for wirelessnetware.ca:** List the XQ+31LC10D as a recommended accessory on the CRS504-4XQ-IN, CRS504-4XQ-OUT, CRS510-8XS-2XQ-IN, CRS518-16XS-2XQ-IN, and CCR2216 product pages. Suggested label: *"Add 100G single-mode fiber connectivity up to 10km — XQ+31LC10D QSFP28 transceiver (USD 349.00)"*

Key specifications:

- **Product code:** XQ+31LC10D

- **Format:** QSFP28

- **Data rate:** 100G (4× 25G channels)

- **Standard:** 100GBASE-LR4 (IEEE 802.3ba)

- **Fiber mode:** Single-mode (OS2)

- **Connector:** Dual LC UPC

- **Wavelengths:** 1296nm, 1300nm, 1305nm, 1309nm

- **Reach:** 10km

- **Digital diagnostics:** Optical power, voltage, temperature, laser bias current

- **MTBF:** ~200,000 hours at 25°C

- **Compatible devices:** CCR2216, CRS504-4XQ-IN/OUT, CRS510-8XS-2XQ-IN, CRS518-16XS-2XQ-IN

- **Certifications:** None listed (passive optical module)

- **Suggested price:** USD 349.00