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What payment methods do you accept?

We accept the following payment methods:Credit/Debit Cards: Visa, MasterCard, American ExpressPayPal: Secure online paymentWire Transfer: Bank transfer for bulk/wholesale ordersWestern Union: Available for international customersAll payments are processed securely. Your information is encrypted.

What is your shipping policy?

We offer worldwide shipping:Express (DHL/FedEx/UPS): 3-7 business daysAir Mail (China Post): 15-25 business daysSea Freight: Available for bulk wholesale ordersOrders processed within 1-2 business days after payment. Free shipping available for qualifying orders.

Do you offer OEM/ODM services for fiber optic products?

Yes, we offer OEM and ODM services:OEM: Custom branding with your logo and packaging on existing productsODM: Custom product design based on your specificationsCustomization: Custom cable lengths, connector types, and packagingMOQ varies by product (typically 50-100 units). Contact our sales team for a quote.

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.

ONU/ONT Buying Guide: 7 Key Factors

ONU/ONT Buying Guide: 7 Key Factors to Choose the Right Fiber Modem

27/04/2026 Langzhi Technology

How to choose the right ONU/ONT for your FTTH network? This guide covers 7 key factors: PON type compatibility, speed requirements, port configuration, WiFi specs, OLT compatibility, management features, and power budget. Essential for ISPs, operators, and end users.

Why Choosing the Right ONU/ONT Matters

ONU and ONT are the most important user-side devices in FTTH networks. Choosing the wrong device can cause compatibility issues, performance bottlenecks, or complete failure to connect.

7 Key Factors for ONU/ONT Selection

1. PON Type Compatibility

GPON: Most widely deployed, 2.5Gbps down/1.25Gbps up, ideal for most FTTH
EPON: IEEE standard, symmetric 1.25Gbps, common in Asia and enterprises
XPON: Dual-mode supporting GPON and EPON, auto-switching, highest flexibility
XGS-PON: 10G symmetric, for high-end users and future upgrades

Tip: If unsure about your OLT type, choose XPON dual-mode ONU for maximum compatibility.

2. Speed & Bandwidth Needs

Standard home (4-6 devices): 1Gbps ONU sufficient
Heavy users/home office: 2.5G or 10G ONU recommended
Business users: XGS-PON ONU for stability and high bandwidth

3. Port Configuration

1GE: For basic setups with external router
4GE: Direct connection for multiple wired devices
With POTS: For VoIP phone service
With USB: For storage sharing or 4G backup

4. WiFi Specifications

No WiFi (SFU): Lowest cost, use your own router
Dual-band 2.4G+5G: Mainstream choice, good coverage and speed
WiFi 6 (AX): Fastest growing category, future-proof choice

5. OLT Compatibility

XPON dual-mode ONUs work with most OLT brands including Huawei, ZTE, Nokia, and Fiberhome. Langzhi's L801 XPON ONT and L881G XPON ONT are compatible with all major OLT brands.

6. Management Features

TR-069: Remote management for ISP批量 deployment
OMCI: GPON standard management protocol
Web GUI: Local configuration interface
VLAN/QoS: Essential for IPTV and VoIP

7. Power Budget

ONU receive sensitivity determines stability at long distances or high split ratios. GPON ONUs typically require ≥28dB power budget. For networks with multiple splitters, choose high-sensitivity ONUs.

Selection Summary

Scenario	Recommended
Basic home broadband	1GE XPON ONU (e.g., L801)
Home with WiFi needs	4GE + Dual-band WiFi XPON ONT (e.g., L881G)
IPTV+VoIP+Internet	4GE+WiFi+POTS ONT
Enterprise/High bandwidth	XGS-PON ONU
ISP bulk deployment	Compatible XPON ONU per OLT brand

Visit Langzhi ONU/ONT product page for more options.