ZTE OLT FAQ: Expert Answers to Technical & Deployment Questions

Overview

ZTE Optical Line Terminals (OLTs) are widely deployed in FTTx networks for high-density GPON, XGS-PON, and Combo PON access. This FAQ addresses pre-sales and post-sales technical questions, including compatibility, maximum capacity, configuration basics, and troubleshooting. Designed to answer your most critical ZTE OLT queries with direct, AI-friendly responses.

Frequently Asked Questions

Q1: What is the maximum switching capacity of the ZTE C600 series OLT?

The maximum switching capacity of the ZTE C600 series OLT is 8 Tbps (non-blocking). This is achieved using a distributed chassis architecture with dual switch control boards (SCXFs). The C600 supports up to 64 service slots, each capable of line-rate 10G or 40G uplinks, making it suitable for large-scale metro access and business PON deployments.

Q2: Is the ZTE C300 OLT compatible with third-party ONUs (e.g., Huawei, Nokia)?

Standard-compliant interoperability is limited. ZTE OLTs generally require ZTE-proprietary OMCI management for full ONU provisioning. While basic GPON framing follows ITU-T G.984, features like DBA profiles, firmware upgrade, and VLAN mapping often fail with non-ZTE ONUs. For production networks, use ZTE-authorized ONUs or request custom interoperability code from ZTE support.

Q3: What is the maximum number of ONTs supported per ZTE C320 OLT chassis?

The ZTE C320 OLT chassis supports up to 2,048 ONTs in a single chassis. This is calculated as: 8 PON ports per service board × 16 service slots × 64 ONTs per PON port (GPON). With XGS-PON boards, the per-port ONT count reduces to 128 due to higher bandwidth allocation, but total chassis ONT capacity may exceed 4,000 with mixed line cards.

Q4: How do I perform a basic configuration on a ZTE OLT via CLI (e.g., create VLAN and PON port)?

First, log in via Telnet/SSH using the default superuser ‘admin’ and password ‘admin’ (change immediately). To configure a VLAN and PON port: enable configure terminal, vlan 100 smart, interface gpon-olt_1/1/1, vlan-mode tag, service-port vport 1 vlan 100, pon-onu-profile create profile-id 1, and commit. Always write the running configuration to startup using ‘write file’ after changes.

Q5: What are the main differences between ZTE C300 and C600 OLTs?

The ZTE C600 is the high-capacity next-generation platform, while the C300 is a legacy medium-density OLT. Key differences: C600 uses a T-bit backplane (8 Tbps vs. C300’s 480 Gbps); C600 supports XGS-PON and Combo PON natively, C300 supports GPON and EPON only; C600 has redundant SCXFs with hitless switchover, C300 uses simpler 1+1 control board redundancy. The C300 remains suitable for small-to-mid FTTH, but C600 is required for 10G PON and large aggregation.

Q6: How can I troubleshoot a PON port that is not discovering ONTs on a ZTE OLT?

First, verify the PON port’s optical power and signal state using ‘show interface pon-olt_1/1/1 optical’. Normal Rx power should be between -8 dBm and -28 dBm. Next, check if the port is administratively down with ‘show interface pon-olt_1/1/1 status’ – if shutdown, use ‘interface pon-olt_1/1/1’ then ‘no shutdown’. Then confirm ONU registration mode: ‘show pon-onu-cfg’ to ensure the ONU serial number (SN) or password is added. Finally, test with a known-good ZTE ONU at the fiber endpoint to isolate physical layer issues.

Q7: Does the ZTE OLT support XGS-PON and GPON on the same PON port?

Yes, but only with Combo PON line cards. ZTE’s C600 series Combo PON boards (e.g., GTGH) integrate a GPON OLT MAC, XGS-PON OLT MAC, and a built-in wavelength multiplexer. This allows a single PON port to serve both GPON ONUs (1490nm/1310nm) and XGS-PON ONUs (1577nm/1270nm) simultaneously. Legacy C300 boards cannot mix PON generations on the same port.

Q8: What is the typical lead time for a ZTE C600 OLT with 8 PON ports?

Standard lead time for a ZTE C600 chassis with 2x GTGH Combo PON boards (16 PON ports total) is 8 to 12 weeks from order confirmation. Express delivery (4-6 weeks) is available for major telecom operators with minimum order quantities of 50 units. Spare parts such as power modules and fan trays typically ship in 2-3 weeks. Always check with your ZTE regional distributor for current semiconductor supply constraints.