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ZTE / Baseband Units & Processing Boards (BBU)

ZTE ZXSDR B8300 BBU Unit Equipment information & support

The ZTE ZXSDR B8300 is a compact 3U 19-inch rack-mount multi-mode indoor Baseband Unit (BBU) engineered for distributed cellular base stations, supporting GSM, UMTS, LTE, and 5G co-sited deployments with high slot density and optical CPRI interfaces.

Equipment information

Brand
ZTE
Equipment model
ZTE ZXSDR B8300 BBU Unit
Equipment type
Baseband Units & Processing Boards (BBU)
Controller / software version
Confirm against the installed equipment
View full product specifications
ZTE ZXSDR B8300 BBU Unit Official Product View 1

Information below comes from the current product catalogue. Confirm the controller, software version and configuration of the installed equipment separately.

Board Type
3U 19-Inch Rackmount
Port Density & Specs
Multi-slot modular high-density backplane architecture
Supported Chassis
smooth evolution with GSM / UMTS / LTE / 5G multimode operation in one chassis
Subscriber Capacity
Long-distance fiber-optic extension of the RRU radio frequency unit, significantly reducing equipment-room footprint and feeder loss
Power Consumption & Auto Sleep
Dual Redundant DC Power Supply (-48V DC) W
Non-Volatile Log Capacity
10,000+ Cyclic Event Records

Alarms & troubleshooting

OPT_LOS (Optical Receiver Loss of Signal)
Board ALM LED steady red; target SFP LNK/ACT LED OFF
Fiber patch cord severed/excessively bent, peer RRU/AAU powered down, SFP RX sensor degraded, or dust cap obscuring optical interface.
1. Inspect optical patch route; verify bend radius exceeds 40 mm with no pinching. 2. Measure RX optical power at the BBU end using an optical power meter, ensuring it meets SFP sensitivity limits (typically -15 dBm to -3 dBm). 3. Clean LC fiber ferrules and SFP optical bore; if optical power remains absent, replace patch cord or remote RRU SFP.
SFP_TEMP_HIGH (SFP Module Temperature Exceeded)
Board ALM LED flashing yellow or red (1 Hz); port LED steady amber
B8300 subrack fan tray failure/stall, dust filter clogged, cabinet ambient temperature exceeding 55°C, or internal SFP DDM sensor failure.
1. Check B8300 fan status and SFP DDM temperature telemetry via EMS/LMT (standard industrial threshold: -40°C to +85°C). 2. Remove and clean the subrack air filter; ensure unobstructed airflow. 3. If temperature anomaly is isolated to a single SFP (>90°C), hot-swap and replace with a certified industrial-temperature ZTE SFP module.
LASER_BIAS_HIGH (Transmitter Laser Bias Current Degradation)
Board ALM LED slow-flashing amber (0.5 Hz); port LED blinking amber or steady green
Semiconductor Laser Diode (LD) aging inside the SFP transmitter, driver IC degradation, or end-of-life condition threatening imminent link drop.
1. Access LMT/EMS to read DDM telemetry; verify if Tx Bias Current exceeds threshold (typically >80 mA). 2. Cross-reference Tx Output Power to verify optical power output degradation. 3. Schedule maintenance window and hot-swap the degraded SFP transceiver before catastrophic optical path loss occurs.
CPRI_SYNC_FAIL (CPRI Optical Interface Loss of Frame Synchronization)
Board ALM LED steady red; optical port ACT/LNK LED flashing red slowly
CPRI rate mismatch (e.g., 2.4G/4.9G/9.8G misconfiguration), optical jitter causing high Bit Error Rate (BER), baseband clock PLL loss-of-lock, or faulty SFP/SerDes serializer.
1. Verify CPRI rate configuration (e.g., Option 3/7/8) matches between the B8300 baseband board and peer RRU in the EMS. 2. Perform SFP local and remote loopback tests to isolate whether the fault is optical path attenuation, transceiver-related, or board SerDes hardware failure. 3. Replace the SFP module with a verified high-speed optical module, or swap the baseband processing card (e.g., UBPG/UBFI).
SFP_TYPE_MISMATCH (Optical Module Type or Rate Incompatible)
Board ALM LED steady yellow; optical port LNK/ACT LED flashing amber rapidly (2 Hz)
Installation of non-ZTE certified optical transceiver with unreadable/locked EEPROM, wavelength mismatch (e.g. 1310nm single-mode mixed with 850nm multi-mode), or 1.25Gbps module inserted into 10G/25G port without auto-negotiation.
1. Execute EMS command to query port SFP Vendor Name, Part Number, and EEPROM manufacturing data. 2. Verify cable medium matches transceiver optical wavelength (single-mode yellow patch for 1310 nm/1550 nm; multi-mode orange/aqua for 850 nm). 3. Replace the unrecognized transceiver with an official ZTE-qualified SFP/SFP+ module compliant with B8300 hardware compatibility specifications.

Access Complete Maintenance & Full Alarm Troubleshooting Manual

This page lists high-frequency critical alarm codes commonly encountered in field maintenance. Comprehensive manufacturer troubleshooting matrices, board-level repair guides, detailed electrical schematics, and firmware commissioning manuals are delivered alongside equipment upon formal project procurement, accompanied by dedicated FAE technical support.

Contact Account Manager for Full Manual

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