Teardown of ZTE F7015TV3 2.5G Optical Modem- Zeruns's Blog

ZTE F7015TV3 2.5G Optical Modem Teardown

I recently switched to the trending F7015TV3 optical modem, primarily for its 2.5G port, compact size, low power consumption (no built-in WiFi), and support for both XGPON and XEPON protocols.

However, during actual use, the device ran surprisingly hot. When placed in my server cabinet (ambient temperature 35°C+), its temperature soared to 74°C+, causing frequent reboots every few minutes. After adding a cooling fan, the temperature dropped to around 52°C, finally stabilizing the connection. For comparison, my previous Huawei optical transceiver ran stably even at 80°C+.

Speed tests showed it fully utilizes gigabit broadband, achieving around 1200MBps (thanks to extra bandwidth reserved by the ISP). While 2000Mbps plans are available in my area, I skipped them due to high costs.

2.5G Optical Transceiver Purchase Link: https://s.click.taobao.com/4cZCQjt
VSOL 2.5G Optical Modem: https://s.click.taobao.com/QKq65kt

Electronics/MCU Technical Exchange QQ Group: 2169025065

Exterior Photos

Front View

Side Views

Rear Ports: Features 1×2.5G port, 1×IPTV port, 2×Gigabit ports, and 1×phone line port.

Bottom View & Device Info Sticker

Bottom View: Includes device info sticker and SC fiber optic port.

Sticker details:

Product Name: 10Gbit/s Passive Optical Network User Terminal (XG-PON ONU)
Model: ZXNH F7015TV3
Power Specifications: 12V 1A
Manufacturing Date: 2024/02
Default Configuration Address: 192.168.1.1
Default Admin Account: useradmin
Default Admin Password: echcf

Installed in Server Cabinet

Related Reviews:

Internal Teardown Photos

Underside of PCB
The board reveals a chip labeled "HYF2G" (likely a 2Gbit/256MB NAND Flash from Jiangsu Yangheyang) for firmware storage.

Front Side of PCB
A fiber optic cable connects from a shielded optical module (inside the metal enclosure) to the SC port. Despite the large heatsink, thermal performance remains subpar.

Main Components:

Primary SOC: ZXIC ZX279133 (ZTE's in-house 14nm chip with dual-core A53 CPU + 8-core NPU)
Memory: GigaDevice GDP2BFLM-CB DDR3L (4Gbit/512MB @1866Mbps)
2.5G PHY: Realtek RTL8221B
FXS Chip: Skyworks Si32192FM1 (VoIP/POTS interface)

Mystery Components:

A "69L2341" marked chip (likely telephone line protection circuitry)
Multiple unmarked 5-pin LDOs and 6-pin DC-DC converters for voltage regulation

Comment from adonis (WeChat public account reader):

The "69L2341" handles telephone port protection. The 5-pin ICs are LDOs, while 6-pin ones are DC-DC converters for generating 5V/3.3V/2V/1V rails. Our factory manufactures optical modems/routers for ZTE, FiberHome, and Xiaomi—this unit might be our OEM product.