





RRU3971 1800MHz (4*40W) Multi-mode 02311HKL WD5M18397100 outdoor Radio module DBS3900
RRU3971 1800MHz Technical Specifications
The RRU3971 is an outdoor remote radio unit. It is the radio frequency (RF) part of a distributed base station and can be located near antennas. The RRU3971 can modulate, demodulate, combine, and divide baseband and RF signals. It also processes baseband and RF signal data. With the Software Defined Radio (SDR) technology, the RRU3971 supports the dual-mode operation of GL mode.
Adopting an innovative design, RRU3971 is able to work in 4 TX and 4 RX mode and therefore supports higher output power and larger carrier capacity.
The software version of the RRU3971 is SRAN11.1, which is compatible with the N-1 and N-2 versions of MBTS, MBSC, and OSS NEs. Therefore, the RRU3971 can be used with products of SRAN9.0, SRAN10.1 and SRAN11.1 versions. All these three versions include the RRU3971 software components. The RRU3971 used in SRAN9.0, SRAN10.1 and SRAN11.1 has no impact on the KPI of products.

RRU3971 frequency band
Type |
Frequency Band (MHz) |
RX Frequency Band (MHz) |
TX Frequency Band (MHz) |
IBW (MHz) |
RRU3971 |
1800 |
1710 to 1785 |
1805 to 1880 |
45 |
Single-mode capacity
Mode |
Capacity |
LTE |
Each RRU3971 supports 2 carriers (4x4 MIMO). The LTE bandwidth is 5, 10, 15, or 20 MHz. |
Dual-mode capacity
Mode |
Capacity |
GSM+LTE |
For detailed specifications |
Typical output power of RRU3971 (4 x 40 W, 1800 MHz, GL MSR)
Number of GSM Carriers |
Number of LTE Carriers |
Output Power per GSM Carrier (W) |
Output Power per LTE Carrier (W) |
Bandwidth of LTE Carrier (MHz) |
2 |
1 (MIMO) |
15 |
4x25 |
5, 10, 15, 20 |
2 |
1 (MIMO) |
20 |
4x20 |
5, 10, 15, 20 |
2 |
2 (MIMO) |
20 |
4x10 |
5, 10, 15, 20 |
4 |
1 (MIMO) |
15 |
4x10 |
5, 10, 15, 20 |
4 |
1 (MIMO) |
10 |
4x20 |
5, 10, 15, 20 |
4 |
2 (MIMO) |
10 |
4x10 |
5, 10, 15, 20 |
Power consumption of the DBS3900 (Ver.D) (–48 V DC) (configured with RRU3971, 4 x 40 W, 1800 MHz)
Mode |
Configuration |
Output Power per Carrier (W) |
Typical Power Consumpt ion (W) |
Maximu m Power Consum ption (W) |
LTE |
3 x 20 MHz, 1 carrier |
4x40 |
1550 |
1840 |
Input power
Item |
Specifications |
Input power |
–48 V DC; voltage range: –36 V DC to –57 V DC The RRU3971 supports AC power supply when connected to an external AC/DC power module or an OPM15M. For details, see AC/DC Power Module User Guide and OPM15M User Guide. |
Equipment specifications
Item |
Specifications |
Dimensions (H x W x D) |
400 mm x 300 mm x 100 mm (without the housing) |
Weight |
15 kg (without the housing) |
CPRI port specifications
Item |
Specifications |
Number of CPRI ports |
2 |
CPRI data rate |
1.25 Gbit/s, 2.5 Gbit/s, 4.9 Gbit/s, and 9.8 Gbit/s |
Topology |
Star, chain, or dual-star |
Cascading Levels |
GL CPRI MUX: 4 |
Maximum Distance from the BBU |
The maximum distances of the RRUs from the BBU vary with the types of BBP in LTE mode as follows: l LBBPd1/UBBPd3: 20 km l LBBPd2/UBBPd4: 40 km l LBBPd3/UBBPd5/UBBPd6: - Number of LTE cells ≤ 3: 40 km - Number of LTE cells > 3: 20 km |
Environment specifications
Item |
Specifications |
Operating temperature |
–40°C to +55°C (without solar radiation) –40°C to +50°C (with solar radiation) |
Relative humidity |
5% RH to 100% RH |
Absolute humidity |
1 g/m3 to 30 g/m3 |
Atmospheric pressure |
70 kPa to 106 kPa |