The Huawei UBBPg2 and Huawei UBBPg2a look almost identical and share most of their LTE and UMTS capacity figures, but they are not the same board. The short answer: the UBBPg2a adds eCPRI on its fronthaul ports and is listed for NR TDD, including massive MIMO cell configurations, while the plain UBBPg2 is a CPRI board aimed at UMTS, LTE and NR FDD. If your site will host 5G TDD AAUs, plan for the UBBPg2a; if you are expanding LTE or NR FDD capacity on a BBU5900 or BBU3910, the UBBPg2 is often enough. This guide explains the differences, what the two boards have in common, and how to choose the right spare.
What the UBBPg2 and UBBPg2a are
Both boards belong to Huawei’s g-series of Universal Baseband Processing (UBBP) boards. A UBBP board sits in a service slot of the baseband unit, processes uplink and downlink baseband signals, and connects to remote radio units (RRUs) and active antenna units (AAUs) over optical fronthaul. Control, transport and clock functions are handled separately by the UMPT main control board in the same chassis.
The “a” suffix in Huawei board names marks a separate hardware variant with its own model code, not a cosmetic revision. The UBBPg2 carries model code WD2DUBBPG200, while the UBBPg2a carries WD2DUBBPG2A0. Treat them as two different items in your inventory and on purchase orders.
UBBPg2 vs UBBPg2a: side-by-side comparison
The table below summarises the main points from Huawei’s SRAN18.1 board specifications as reproduced in published board datasheets. Capacity in service always depends on the software release, the main control board and the licences on site.
| Item | UBBPg2 | UBBPg2a |
|---|---|---|
| Model code | WD2DUBBPG200 | WD2DUBBPG2A0 |
| Board family | UBBP, g-series | UBBP, g-series |
| Fronthaul ports | 6 | 6 |
| Fronthaul protocol | CPRI | CPRI / eCPRI |
| RATs listed | UMTS, LTE FDD, LTE TDD, LTE NB-IoT, NR FDD | UMTS, LTE FDD, LTE TDD, LTE NB-IoT, NR FDD, NR TDD |
| NR TDD massive MIMO cells | Not listed in the board’s RAT set | Listed, e.g. 3 x 20–100 MHz cells at 32T32R or 64T64R |
| NR TDD throughput (DL:UL 4:1) | Not applicable | DL 6 Gbit/s, UL 0.9 Gbit/s |
| LTE FDD throughput | DL 2400 Mbit/s, UL 1200 Mbit/s | DL 2400 Mbit/s, UL 1200 Mbit/s |
| LTE RRC-connected UEs (5–20 MHz) | Up to 4800 | Up to 4800 |
| UMTS cells | 12 cells (2R) or 6 cells (4R) | 12 cells (2R) or 6 cells (4R) |
| Host BBUs (SRAN18.1) | BBU3910, BBU5900, BBU5900A | BBU3910, BBU5900, BBU5900A |
One caution: some published datasheet copies show NR TDD figures in a shared table for both boards, while the UBBPg2’s own RAT list does not include NR TDD. If you intend to run NR TDD, specify the UBBPg2a and confirm support against the release notes for your exact software version.
The key difference: eCPRI and NR TDD
Fronthaul protocol
CPRI is the classic fronthaul interface between Huawei baseband boards and RRUs. Many 5G TDD AAUs and newer radios can also use eCPRI, a packet-based fronthaul that carries higher bandwidth more efficiently for wide NR carriers and large antenna arrays. The UBBPg2a supports both CPRI and eCPRI; the UBBPg2 is listed with CPRI only. This is the main reason the UBBPg2a is the board operators reach for on 5G TDD sites.
NR TDD and massive MIMO
The UBBPg2a is listed for NR TDD cells from 20 to 100 MHz in 1T1R, 2T2R and 4T4R configurations, and for three-cell 8T8R, 32T32R and 64T64R configurations, which covers typical 3.5 GHz massive MIMO deployments. With a 4:1 downlink-to-uplink frame configuration, the listed NR TDD throughput is 6 Gbit/s downlink and 0.9 Gbit/s uplink. For a site that combines LTE FDD on RRUs with an NR TDD AAU, the UBBPg2a gives you one board type that can serve both.
What the two boards have in common
- Six fronthaul ports for connecting RRUs or AAUs.
- Identical LTE capacity figures: up to 4800 RRC-connected UEs for 5–20 MHz LTE cells and LTE FDD throughput of 2400 Mbit/s downlink and 1200 Mbit/s uplink.
- Identical UMTS capacity: 12 cells with 2 receive branches or 6 cells with 4 receive branches.
- Same host chassis: the BBU3910, the Huawei BBU5900 and the BBU5900A on SRAN18.1. Huawei’s DBS5900 product page lists the UBBPg2 among the baseband boards for the BBU5900.
- Multi-mode operation and co-BBP configurations, subject to software and licences.
For a deeper look at which UBBP and UMPT generations fit which chassis, see our Huawei BBU5900 board compatibility guide.
Which board should you buy?
| Site scenario | Suggested board | Why |
|---|---|---|
| LTE FDD capacity expansion on BBU5900 or BBU3910 | UBBPg2 | Same LTE capacity figures as the UBBPg2a |
| UMTS/LTE multi-mode site, no 5G TDD planned | UBBPg2 | Covers UMTS, LTE and NR FDD |
| NR TDD with 32T32R or 64T64R AAUs | UBBPg2a | Listed for NR TDD massive MIMO cells |
| Radios or AAUs that use eCPRI fronthaul | UBBPg2a | Supports CPRI and eCPRI |
| Like-for-like replacement of a failed board | Same model as installed | Keeps configuration, fibre mapping and OSS data unchanged |
As a rule, replace like with like. A UBBPg2a can usually take over LTE work from a UBBPg2, but swapping board types changes the board inventory the OSS expects, so the site configuration has to be updated. Going the other way, replacing a UBBPg2a with a UBBPg2 on an NR TDD site, is not a valid swap.
Checks before ordering a used UBBPg2 or UBBPg2a
- Read the label. Confirm the board name and BOM code on the panel label. UBBPg2 and UBBPg2a, and also UBBPg1 and UBBPg1a, are easy to mix up in a spreadsheet.
- Check the software release. Each board variant is supported from a specific base station version onward. A board newer than the site load may not be recognised.
- Match the main control board. The UMPT in the chassis must support the same RAT combination you plan to run on the UBBP.
- Plan licences. Capacity and features are licensed per base station, not stored on the board. A replacement board does not bring licences with it.
- Check the optics. Confirm the SFP modules and fibre type match the radios on site, and inspect the optical ports and backplane connector for damage.
- Count the cooling budget. Several high-capacity boards in one chassis raise heat load; make sure the fan module matches the chassis generation.
You can browse related boards such as the Huawei UBBPg3 and the full range in our Huawei category.
FAQ
Is the UBBPg2a just a newer revision of the UBBPg2?
No. It has its own model code (WD2DUBBPG2A0 versus WD2DUBBPG200) and a different capability set, most notably eCPRI and NR TDD support. Order it as a separate part.
Do the UBBPg2 and UBBPg2a have the same number of ports?
Yes. Both boards are listed with six fronthaul ports. The difference is the protocol: CPRI on the UBBPg2, CPRI or eCPRI on the UBBPg2a.
Can I use either board in a BBU3910?
Huawei’s SRAN18.1 board specifications list both boards for the BBU3910, BBU5900 and BBU5900A. Confirm that your site’s software release supports the board before installing it.
Is LTE capacity higher on the UBBPg2a?
Not according to the published figures. LTE FDD throughput, LTE connected users and UMTS cell capacity are listed the same for both boards. The UBBPg2a’s advantage is on the 5G TDD and fronthaul side.
Source tested Huawei UBBPg2 and UBBPg2a boards
We supply used and refurbished Huawei UBBP and UMPT boards, BBU chassis and RRUs to operators, maintenance companies and integrators worldwide. Every unit is functionally tested before shipment (radio units such as RRUs are also VSWR tested), comes with a 90-day warranty, and is shipped worldwide in secure packaging. Send us the board name, BOM code and quantity you need via WhatsApp +86 187 3329 4669 / +86 139 3088 8705, by email at jack@telecombts.com, or through the form at https://telecombts.com/contact-us/. We also buy surplus Huawei, Ericsson and Nokia equipment: see sell your equipment.