What is the difference between GPON and EPON?

GPON offers higher downstream bandwidth and better QoS. EPON provides symmetric bandwidth at lower cost. GPON supports split ratios up to 1:128 for wider coverage.

Which ONU/ONT is compatible with my OLT?

Our L880G and L801 series ONUs support XPON dual-mode and work with Huawei, ZTE, FiberHome and other major OLT brands. Contact support to confirm compatibility.

What is the difference between SC/APC and SC/UPC connectors?

SC/APC (Angled Physical Contact) and SC/UPC (Ultra Physical Contact) are two common fiber optic connector polish types. The key difference is the end-face angle.SC/UPC: Flat end-face with slight curve, return loss ≥50dB. Used for general-purpose data transmission. Blue color.SC/APC: 8° angled end-face, return loss ≥60dB. Used for RF video transmission (CATV) and PON networks. Green color.They are NOT interchangeable — mixing them can damage the connector end-face.

How do I choose the right fiber optic splitter for my network?

Choosing the right fiber optic splitter depends on several factors:Type: PLC splitters offer better performance for FTTx; FBT splitters suit smaller setupsRatio: Common ratios: 1×2, 1×4, 1×8, 1×16, 1×32, 1×64Package: ABS box (indoor), Mini steel tube (tight spaces), LGX cassette (rack mount)Connector: SC/APC for CATV, SC/UPC for dataFor GPON/EPON FTTH deployments, a 1×8 or 1×16 PLC splitter with SC/APC connectors is recommended.

What is the maximum distance for fiber optic transmission?

Fiber optic transmission distance depends on fiber type and equipment:Single-mode fiber (OS2): Up to 40km+ without amplificationMulti-mode fiber (OM1-OM5): 300m to 550m at 10GbpsGPON: Typically 20km reachEPON: Typically 20kmXGS-PON: Up to 40km1550nm wavelength has lower attenuation (≈0.2dB/km) vs 1310nm (≈0.35dB/km). For standard GPON FTTH, 20km is typical from OLT to ONU.

How do I configure an ONU/ONT for my fiber network?

Configuring an ONU/ONT involves these steps:Connect: Plug fiber cable into PON port, Ethernet to your router/PCPower on: Wait for PON LED to turn solid (optical signal received)Access web: Set PC to same subnet (192.168.1.x), open ONU IP (usually 192.168.1.1)Configure WAN: Set connection type (PPPoE, DHCP, or Static IP) per ISP requirementsRegister: Some ISPs require registration via serial number, LOID password, or MAC address

What is XGS-PON and how is it different from GPON?

XGS-PON (10 Gigabit Symmetric PON) is the next-generation PON technology offering 10Gbps symmetric bandwidth. Key differences from GPON:Speed: GPON = 2.5Gbps down / 1.25Gbps up. XGS-PON = 10Gbps both directionsWavelength: XGS-PON uses 1577nm down / 1270nm up (different from GPON's 1490nm/1310nm)Coexistence: XGS-PON can share the same fiber with GPON via WDMXGS-PON ONUs work with dual-mode OLTs but need an XGS-PON port for 10G speeds. Ideal for 4K/8K streaming, cloud computing, and enterprise use.

How Many Homes Can One OLT Port Serve?

In GPON networks, one OLT port typically serves 32 to 128 homes, depending on the split ratio. A 1:32 splitter is most common for FTTH deployments. With XGS-PON, one port can serve 256+ subscribers. Actual capacity depends on bandwidth per user — if each user needs 100Mbps, a GPON port (2.5Gbps down) handles ~25 users at peak. For our 2-port EPON OLT (L202), each port supports up to 64 ONUs, giving a total of 128 homes per device.

How Is GPON Data Secured on Fiber Optic Networks?

GPON uses AES-128 encryption to secure downstream data. Each ONU receives only its own data — the OLT encrypts traffic with a unique key per ONU. Upstream data is inherently secure because each ONU transmits in its assigned time slot. AES encryption is enabled by default in most OLTs like our EPON/GPON models. For additional security, MAC address filtering and ONU authentication are supported.

Is Fiber Optic Cheaper Than Copper in the Long Run?

Yes. While fiber optic cabling costs 20-30% more upfront, its total cost of ownership (TCO) over 10 years is 40-60% lower than copper. Fiber supports 40Gbps+ bandwidth vs copper's 10Gbps limit, has 25+ year lifespan (copper: 5-10 years), and needs no signal repeaters for up to 40km. For ISPs, the breakeven point is typically 2-3 years. Our single-mode fiber patch cables and splitters provide reliable long-term infrastructure.

GPON ONU Cross-Brand Compatibility Guide

Can You Mix & Match OLT and ONU from Different Brands?

The short answer is yes — but success depends on standards compliance, firmware alignment, and proper configuration. This guide explains the principles of cross-brand GPON interoperability, common combinations, and setup steps.

The key mechanism is OMCI (ONU Management and Control Interface) protocol (ITU-T G.988). When both OLT and ONU support standard OMCI, the OLT can recognize and manage ONUs from different manufacturers.

Common Cross-Brand Combinations

✅ Huawei OLT + ZTE ONU

Huawei OLT (MA5600T/MA5800 series) can use ZTE-branded ONUs, provided:

The ONU supports standard ITU-T G.984 GPON protocol
The ONU's serial number (SN) prefix may need to match Huawei format (e.g., starting with HWTC)
Confirm PON port mode using display pon mode on the Huawei OLT

✅ ZTE OLT + Huawei ONT

ZTE OLT can also use Huawei ONT/ONU devices. Both brands follow ITU-T G.984 standards with good OMCI interoperability. Example: Huawei EG8145X6 ONT can register on ZTE GPON OLT.

✅ FiberHome OLT + Third-Party ONU

FiberHome OLT (AN5516 series) supports third-party ONUs with proper authentication configuration.

OMCI: The Key to Cross-Brand Compatibility

OMCI (ITU-T G.988) is the core management protocol of GPON standards. Through OMCI, the OLT can:

Auto-discover and register ONUs
Push service configurations (VLAN, QoS, etc.)
Monitor ONU status and performance
Remotely upgrade ONU firmware

When both OLT and ONU fully implement OMCI standards, cross-brand interoperability is generally reliable.

Common Compatibility Issues and Solutions

Issue	Cause	Solution
ONU fails to register	SN format mismatch	Check SN prefix; may need modification to match OLT brand format
ONU registered but no service	VLAN/OMCI config mismatch	Configure correct service profile on OLT
Firmware incompatibility	Outdated firmware	Upgrade both devices to latest firmware
Low optical power	High split ratio or fiber loss	Check optical link quality, ensure RX power within ONU range

Verified Compatibility Matrix

OLT Brand	Compatible ONU Brands	Compatibility
Huawei	Huawei, ZTE, Langzhi (L801/L880G), VSOL, C-Data	⭐⭐⭐⭐⭐
ZTE	ZTE, Huawei, Langzhi (L881G/F609), FiberHome	⭐⭐⭐⭐⭐
FiberHome	FiberHome, Huawei, ZTE, Langzhi	⭐⭐⭐⭐
C-Data	Most GPON/XPON ONUs	⭐⭐⭐⭐

How to Verify ONU Compatibility

Check ONU specs: Confirm PON standard (GPON G.984, EPON 802.3ah, or XPON dual-mode)
Check OLT config: Use display pon mode on OLT to confirm PON port mode
Choose XPON dual-mode: XPON ONU supports both GPON and EPON with auto-switching — highest compatibility
Verify authentication: Ensure ONU SN/LOID format matches OLT brand requirements

Recommended: Langzhi Cross-Compatible ONUs

Langzhi's full ONU/ONT lineup is tested for compatibility with Huawei, ZTE, FiberHome, and other major OLTs:

L801 XPON ONU — 1GE port, GPON/EPON dual-mode auto-switching, works with all major OLTs
L881G XPON ONU — with WiFi, 1GE+3FE+2USB, ideal for home and small business
H3-2S WiFi 6 ONU — WiFi 6, 4GE ports, perfect for high-bandwidth scenarios

Summary

Cross-brand GPON device mixing is not only possible but increasingly common in modern fiber networks:

Ensure OLT and ONU follow the same PON standard (GPON/EPON)
OMCI is the foundation of cross-brand interoperability
Verify compatibility before purchasing, or choose XPON dual-mode ONU to eliminate concerns
Test a small batch before large-scale deployment

GPON ONU Cross-Brand Compatibility: Will ZTE ONU Work with Huawei OLT? (2026)