eRAN8.1 BBU3910 Description
Issue
Draft A
Date
2014-12-30
HUAWEI TECHNOLOGIES CO., LTD.
Copyright © Huawei Technologies Co., Ltd. 2014. All rights reserved.
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All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
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the customer. All or part of the products, services and features described in this document may not be
within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements,
information, and recommendations in this document are provided "AS IS" without warranties, guarantees or
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Huawei Technologies Co., Ltd.
Address:
Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website:
http://www.huawei.com
Email:
support@huawei.com
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eRAN8.1 BBU3910 Description
Contents
Contents
1 Introduction.................................................................................................................................... 1
1.1 Functions ...................................................................................................................................................................... 1
1.2 Appearance ................................................................................................................................................................... 1
1.3 Boards ........................................................................................................................................................................... 2
1.3.1 UMPT ........................................................................................................................................................................ 2
1.3.2 UBBP ......................................................................................................................................................................... 4
1.3.3 UTRP ......................................................................................................................................................................... 5
1.3.4 USCU......................................................................................................................................................................... 6
1.3.5 UPEUd ....................................................................................................................................................................... 7
1.3.6 UEIU.......................................................................................................................................................................... 8
1.3.7 FAN ........................................................................................................................................................................... 9
1.4 Board Configuration ..................................................................................................................................................... 9
2 Technical Specifications ............................................................................................................ 11
2.1 Baseband Specifications ............................................................................................................................................. 11
2.1.1 Maximum Number of Cells Supported Per Board ................................................................................................... 11
2.1.2 UE Number Specifications ...................................................................................................................................... 12
2.1.3 Maximum Throughput Per Board ............................................................................................................................ 12
2.1.4 Maximum Throughput Per Cell ............................................................................................................................... 13
2.1.5 Maximum Distance from the BBU .......................................................................................................................... 14
2.2 Capacity Specifications............................................................................................................................................... 14
2.3 Signaling Specifications ............................................................................................................................................. 16
2.4 Transmission Ports ...................................................................................................................................................... 16
2.5 Input Power ................................................................................................................................................................. 17
2.6 Physical Specifications ............................................................................................................................................... 17
2.7 Environment Specifications ........................................................................................................................................ 17
3 Acronyms and Abbreviations ................................................................................................... 18
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eRAN8.1 BBU3910 Description
1 Introduction
1
Introduction
1.1 Functions
The BBU3910 is a baseband control unit. Compared with the BBU3900, its backplane has
greater switching capability and the baseband boards installed in slots 0 to 5 all can process
baseband signals. The BBU3910 has the following functions:

Manages the entire base station system in terms of operation, maintenance, and system
clock.

Processes signaling messages.

Provides physical ports for information exchange between the base station and the
transport network.

Provides an OM channel between the base station and the LMT, SMT, or U2000.

Processes uplink and downlink baseband signals.

Provides CPRI ports for communication with the RF modules.

Provides ports for communication with environment monitoring devices.
A base station can be configured with a maximum of two BBU3910s or one BBU3900 and
one BBU3910 to provide higher processing capabilities.
1.2 Appearance
The BBU3910, which has a case structure, is 19 inches wide and 2 U high. The BBU3910 can
be installed in an indoor or outdoor protective cabinet.
Figure 1-1 shows the appearance of the BBU3910.
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eRAN8.1 BBU3910 Description
1 Introduction
Figure 1-1 Appearance of the BBU3910
1.3 Boards
The BBU3910 can be configured with the following boards and units:

Main control and transmission board: Universal Main Processing & Transmission unit
(UMPT)

Baseband processing board: Universal BaseBand Processing unit (UBBP)

Universal Transmission Processing unit (UTRP)

Universal Satellite card and Clock Unit (USCU)

Universal Power and Environment Interface Unit d (UPEUd)

Universal Environment Interface Unit (UEIU)

FANd unit
1.3.1 UMPT
The UMPT is a universal main control and transmission unit for the BBU3910. It manages the
entire eNodeB in terms of OM, processes signaling messages, and provides clock signals for
the BBU3910. There are two types of UMPTs: UMPTb1 and UMPTb2. Table 1-1 describes
the differences between each UMPT type.
Table 1-1 Difference between each UMPT type
Type
Working Mode
Equipped with a
Satellite Card
Data Rate of the CI
Interface (Gbit/s)
UMPTb1
LTE
No
2.5
Yes
2.5
GUL multi-mode
UMPTb2
LTE
GUL multi-mode
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Panel
Figure 1-2 shows the UMPTb1 panel.
Figure 1-2 UMPTb1 panel
Figure 1-3 shows the UMPTb2 panel.
Figure 1-3 UMPTb2 panel
Functions
The UMPT performs the following functions:

Controls and manages the entire base station in terms of configuration, equipment,
performance monitoring, radio resources, and active/standby switchovers.

Processes signaling messages.

Provides a reference clock, transmission ports, and an OM channel to the LMT or
U2000.

Interconnects two BBU3910s and exchanges control information, transmission
information, and clock information between them.
Ports
Table 1-2 describes the ports on the UMPT.
Table 1-2 Ports on the UMPT
Identifier
Connector
Quantity
Description
FE/GE0
RJ45
1
FE/GE electrical port
FE/GE1
SFP
1
FE/GE optical port
CI
SFP female
1
Used for BBU
interconnection
USB
USB
1
A USB flash drive
can be inserted into
the port for software
upgrade and base
station commissioning
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eRAN8.1 BBU3910 Description
1 Introduction
Identifier
Connector
Quantity
Description
CLK
USB
1
Used for multiplexing
the time of day
(TOD) clock and test
clock
E1/T1
DB26 female
1
E1/T1 port supporting
four E1/T1s
GPS
SMA
1

The GPS port on
the UMPTb1 is
reserved.

The GPS port on
the UMPTb2 is
used for
transmitting radio
frequency (RF)
signals received
from the antenna
to the satellite
card.
RST
-
1
Reset button
1.3.2 UBBP
There are four types of UBBPd: UBBPd3, UBBPd4, UBBPd5 and UBBPd6. The UBBPd is
available as of SRAN9.0.
Panel
The UBBPd3, UBBPd4, UBBPd5 and UBBPd6 have the same panel, as shown in Figure 1-4.
Figure 1-4 UBBPd3, UBBPd4, UBBPd5 or UBBPd6 panel
Function
The UBBP performs the following functions:

Provides CPRI ports for communication with the RF modules.

Provides a port for interconnection with another baseband board to share the baseband
resources.
Port
Table 1-3 describes the ports on the UBBPd3, UBBPd4, UBBPd5 or UBBPd6.
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eRAN8.1 BBU3910 Description
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Table 1-3 Ports on the UBBPd3, UBBPd4, UBBPd5 or UBBPd6
Identifier
Connector
Quantity
Description
CPRI0 to CPRI5
SFP female
6
Data transmission
ports that
interconnect the
BBU3910 and the
RF modules. These
ports support
electrical and optical
signal input and
output.
HEI
QSFP
1
Currently reserved
1.3.3 UTRP
The type of UTRP is UTRPc.
Panel
Figure 1-5 shows the UTRPc panel.
Figure 1-5 UTRPc panel
Functions

The UTRPc is available as of eRAN3.0. The UTRPc performs the following functions:
−
Provides transmission for the LTE networks and enables these networks to share the
same IPSec tunnel.
−
Provides two 100 M/1000 M Ethernet electrical ports and performs Ethernet MAC
layer functions, including sending and receiving Ethernet link data and parsing MAC
addresses. Provides four 10 M/100 M/1000 M Ethernet electrical ports and performs
the functions of the MAC layer and physical layer.
Ports
Table 1-4 describes the ports on the UTRPc.
Table 1-4 Ports on the UTRPc
Identifier
Connector
Quantity
Description
FE/GE0 and
FE/GE1
SFP female
2
FE/GE optical ports
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eRAN8.1 BBU3910 Description
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FE/GE2 to FE/GE5
RJ45
4
FE/GE electrical ports
1.3.4 USCU
There are two types of USCU: USCUb11 and USCUb14.
Panel
The panel of the USCUb11 is the same as that of the USCUb14. Figure 1-6 shows the
USCUb11/USCUb14 panel.
Figure 1-6 USCUb11/USCUb14 panel
Functions
The USCU performs the following functions:

The USCUb11 provides ports to communicate with the RGPS (for example the reused
equipment of the customer) and BITS equipment. It does not support GPS signals.

The USCUb14 does not support RGPS signals. It contains a UBLOX satellite card.
Ports
The ports on the USCUb11 and USCUb14 are the same. Table 1-5 describes the ports on the
USCUb11/USCUb14.
Table 1-5 Ports on the USCUb11/USCUb14
Identifier
Connector
Quantity
Description
GPS
SMA
1
The GPS ports on the
USCUb14 receive GPS
signals.
The GPS port on the
USCUb11 is reserved. It
cannot receive GPS
signals.
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eRAN8.1 BBU3910 Description
1 Introduction
Identifier
Connector
Quantity
Description
RGPS
PCB welded wiring
terminal
1
The RGPS port on the
USCUb11 receives RGPS
signals.
The RGPS ports on the
USCUb14 are reserved.
They cannot receive RGPS
signals.
TOD0
RJ45
1
Receives or transmits
1PPS+TOD signals
TOD1
RJ45
1
Receives or transmits
1PPS+TOD signals, and
receiving TOD signals
from the M1000
M-1PPS
SMA
1
Receives 1PPS signals
from the M1000
BITS
SMA
1
Receives BITS clock
signals, supports adaptive
input of 2.048 MHz and 10
MHz clock reference.
1.3.5 UPEUd
The UPEUd is a power module for the BBU3910.
Panel
Figure 1-7 shows the UPEUd panel.
Figure 1-7 UPEUd panel
Functions
The UPEU performs the following functions:

Provides two ports with each transmitting one RS485 signal and two ports with each
transmitting four Boolean signals. The Boolean signals can only be dry contact or open
collector (OC) signals.
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eRAN8.1 BBU3910 Description

1 Introduction
The UPEUd converts -48 V DC input power into +12 V DC and provides an output
power of 650 W.
Ports
Table 1-6 describes the ports on the UPEUd.
Table 1-6 Ports on the UPEUd
Identifier
Connector
Quantity
Description
–48 V
3V3
1
Port for -48 V DC
power input
EXT-ALM0
RJ45
1
Port for Boolean
inputs 0 to 3
EXT-ALM1
RJ45
1
Port for Boolean
inputs 4 to 7
MON0
RJ45
1
Port for RS485 input 0
MON1
RJ45
1
Port for RS485 input 1
1.3.6 UEIU
The UEIU transmits information reported by the environment monitoring device and alarm
information to the main control board.
Panel
Figure 1-8 shows the UEIU panel.
Figure 1-8 UEIU panel
Functions
The UEIU performs the following functions:

Provides two ports, each transmitting one RS485 signal.

Provides two ports, each transmitting four Boolean signals, which can only be dry
contact or OC signals.
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1 Introduction
Transmits information reported by the environment monitoring device and alarm
information to the main control board.
Ports
Table 1-7 describes the ports on the UEIU.
Table 1-7 Ports on the UEIU
Identifier
Connector
Quantity
Description
EXT-ALM0
RJ45
1
Port for Boolean inputs 0 to 3
EXT-ALM1
RJ45
1
Port for Boolean inputs 4 to 7
MON0
RJ45
1
Port for RS485 input 0
MON1
RJ45
1
Port for RS485 input 1
1.3.7 FAN
The FANd is a fan unit for the BBU3910.
Panel
Figure 1-9 shows the FANd panel.
Figure 1-9 FANd panel
Functions
The FANd controls the rotation speed of the fans and monitors the temperature of the fan
module. The FANd reports the status of the fans and the fan module to the BBU and dissipates
heat from the BBU.
1.4 Board Configuration
Figure 1-10 show the typical board configuration for a BBU3910 working in LTE mode.
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eRAN8.1 BBU3910 Description
1 Introduction
Figure 1-10 Typical board configuration for a BBU3910 working in LTE mode
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2
Technical Specifications
2.1 Baseband Specifications
2.1.1 Maximum Number of Cells Supported Per Board
Table 2-1 Maximum number of cells supported per baseband board
Board
Number of
Cells
UBBPd3
3
Cell Bandwidth
（MHz）
1.4/3/5/10/15/20
Antenna
Configuration
3x20M 1T1R
3x20M 1T2R
3x20M 2T2R
UBBPd4
3
1.4/3/5/10/15/20
3x20M 1T1R
3x20M 1T2R
3x20M 2T2R
3x20M 2T4R
3x20M 4T4R
UBBPd5
6
1.4/3/5/10/15/20
6x20M 1T1R
6x20M 1T2R
6x20M 2T2R
UBBPd6
6
1.4/3/5/10/15/20
6x20M 1T1R
6x20M 1T2R
6x20M 2T2R
6x20M 2T4R
6x20M 4T4R
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2 Technical Specifications
2.1.2 UE Number Specifications
Table 2-2 UE number specifications
Board
UBBPd3/
UBBPd4
Cell
Bandwi
dth(M
Hz)
Maximum
Number of
UEs in RRC
Connected
Mode Per
Board
Maximum
Number of
synchronized
users Per
Board
Maximum
Number of
UEs in
RRC
Connected
Mode Per
cell
Maximum
Number of
synchroni
zed users
Per cell
1.4
504
504
168
168
3
1080
1080
360
360
5
1800
1800
600
600
10/15/20
3600
3600
1200
1200
1.4
1008
1008
168
168
3
2160
2160
360
360
5
3600
3600
600
600
10/15/20
3600
3600
1200
1200
1.4
1008
1008
168
168
3
2160
2160
360
360
5
3600
3600
600
600
10/15/20
3600
3600
1200
1200
UBBPd5
UBBPd6
2.1.3 Maximum Throughput Per Board
Table 2-3 Maximum throughput per baseband board
Board
Specifications
UBBPd3
Downlink throughput: 450 Mbit/s
Uplink throughput: 225 Mbit/s
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Board
Specifications
UBBPd4
Downlink throughput: 600 Mbit/s
Uplink throughput: 225 Mbit/s
UBBPd5
Downlink throughput: 600 Mbit/s
Uplink throughput: 300 Mbit/s
UBBPd6
Downlink throughput: 900 Mbit/s
Uplink throughput: 450 Mbit/s
2.1.4 Maximum Throughput Per Cell
Table 2-4 Maximum throughput per cell
Cell
Bandwidth
Specifications
(MHz)

1.4
DL cell MAC layer throughput: 8.7Mbps (at 2x2 MIMO, 64QAM)

UL cell MAC layer throughput: 6.4Mbps (at 2x2 MU-MIMO, 16QAM)

UL cell MAC layer throughput: 3.2Mbps (at 1x4 SIMO, 16QAM)

UL cell MAC layer throughput: 6.4Mbps (at 2x4 MU-MIMO, 16QAM)

3
DL cell MAC layer throughput: 22Mbps (at 2x2 MIMO, 64QAM)

UL cell MAC layer throughput: 16Mbps (at 2x2 MU-MIMO, 16QAM)

UL cell MAC layer throughput: 8Mbps (at 1x4 SIMO, 16QAM)

UL cell MAC layer throughput: 16Mbps (at 2x4 MU-MIMO, 16QAM)

5
DL cell MAC layer throughput: 36Mbps (at 2x2 MIMO, 64QAM)

UL cell MAC layer throughput: 27Mbps (at 2x2 MU-MIMO, 16QAM)

UL cell MAC layer throughput: 13Mbps (at 1x4 SIMO, 16QAM)

UL cell MAC layer throughput: 27Mbps (at 2x4 MU-MIMO, 16QAM)

10
DL cell MAC layer throughput: 73Mbps (at 2x2 MIMO, 64QAM)

UL cell MAC layer throughput: 55Mbps (at 2x2 MU-MIMO, 16QAM)

UL cell MAC layer throughput: 27Mbps (at 1x4 SIMO, 16QAM)

UL cell MAC layer throughput: 55Mbps (at 2x4 MU-MIMO, 16QAM)

15
DL cell MAC layer throughput: 110Mbps (at 2x2 MIMO, 64QAM)

UL cell MAC layer throughput: 81Mbps (at 2x2 MU-MIMO, 16QAM)

UL cell MAC layer throughput: 40Mbps (at 1x4 SIMO, 16QAM)

UL cell MAC layer throughput: 81Mbps (at 2x4 MU-MIMO, 16QAM)
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eRAN8.1 BBU3910 Description
Cell
Bandwidth
2 Technical Specifications
Specifications
(MHz)

DL cell MAC layer throughput: 150Mbps (at 2x2 MIMO, 64QAM)
20

UL cell MAC layer throughput: 100Mbps (at 2x2 MU-MIMO, 16QAM)

UL cell MAC layer throughput: 55Mbps (at 1x4 SIMO, 16QAM)

UL cell MAC layer throughput: 100Mbps (at 2x4 MU-MIMO, 16QAM)
2.1.5 Maximum Distance from the BBU
Table 2-5 Maximum distance from the BBU
Board
Specifications（km）
UBBPd3
20
UBBPd4
40
UBBPd5/UBBPd6
Cell quantity≤3: 40
Cell quantity≥4: 20
2.2 Capacity Specifications

Maximum number of busy hour call attempts (BHCAs) per eNodeB:
The maximum number of busy hour call attempts (BHCAs) per eNodeB see 2.3
Signaling Specifications.

Maximum throughput per eNodeB:
Table 2-6 lists the maximum throughput per eNodeB (packet size: 550 bytes).
Table 2-6 Maximum throughput per eNodeB (packet size: 550 bytes)
Board
Specifications
LMPT
Uplink data rate at the MAC layer: 300Mbit/s
Downlink data rate at the MAC layer: 450Mbit/s
UMPT

Uplink and downlink data rate at the MAC layer: 1500Mbit/s
Maximum number of UEs in RRC_CONNECTED mode per eNodeB FDD:
The maximum number of UEs in RRC_Connected mode supported by an eNodeB can be
calculated using the following formula:
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Maximum number of UEs in RRC_Connected mode supported by an eNodeB =
Min (Maximum number of UEs in RRC_Connected mode supported by the main
control board, N x Maximum number of UEs in RRC_Connected mode supported
by a baseband board)
The main control board is the LMPT or UMPT.
Table 2-7 lists the maximum number of UEs in RRC_CONNECTED mode supported by
the main control board.
Table 2-7 Maximum throughput per eNodeB (packet size: 550 bytes)
Board
Specifications
LMPT
5400
UMPT
10800
N is the number of baseband boards, the baseband boards is LBBP or UBBP. The
maximum number of UEs in RRC_CONNECTED mode supported by baseband board
see 2.1.2 UE Number Specifications.

Maximum Number of DRBs Supported:
The maximum number of data radio bearers (DRBs) per user is eight.
The maximum number of DRBs supported by an LMPT/UMPT/LBBP/UBBP is three
times the maximum number of UEs in RRC_Connected mode supported.
The maximum number of DRBs supported by an eNodeB is 32,400.
Table 2-8 lists the capacity specifications of the 3900 series base station in typical configurations.
Table 2-8 Capacity specifications of the 3900 series base station in typical configurations
Mode
Configuration
LTE
UMPTb2+6
（FDD） UBBPd6
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Item
Specifications
Maximum number of
cells per BBU
36 cells (2T2R);
Maximum number of
busy hour call attempts
(BHCAs) per eNodeB
FDD
480000
Maximum throughput per
eNodeB FDD
1500Mbit/s
Maximum number of
UEs in
RRC_CONNECTED
mode per eNodeB FDD
10800
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2 Technical Specifications
2.3 Signaling Specifications
Table 2-9 lists the signaling specifications of the UMPT and LBBP.
Table 2-9 Signaling specifications of the UMPT and LBBP
Specification
Signaling Specification(BHCA)
UMPTb1/UMPTb2
240000
UBBPd3, UBBPd4
110000
UBBPd5, UBBPd6
220000
The signaling specification of an eNodeB is calculated by the following formula:
In UBBPd+UMPT scenarios, eNodeB signaling specifications = N x UBBPd signaling
specifications, where N is the number of UBBPd boards.
NOTE
The signaling specifications of an eNodeB cannot exceed 480000 BHCA.
Table 2-10 lists the typical board combinations and the corresponding signaling specifications
of eNodeBs.
Table 2-10 Typical board combinations and the corresponding signaling specifications
Specification
Signaling Specification(BHCA)
1 UMPTb+1 UBBPd
90000 (UBBPd3/UBBPd4)
180000 (UBBPd5/UBBPd6)
2.4 Transmission Ports
Table 2-11 Transmission ports
Boards
Ports
UMPT
One FE/GE electrical port +one FE/GE optical port+one
E1/T1 port. (Each E1/TI port provides 4 E1s/T1s.)
UTRPc
Four FE/GE electrical ports + two FE/GE optical ports
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2.5 Input Power
Table 2-12 Input power
Item
Specification
Input power
UPEUd: –48 V DC
Voltage range: –38.4 V DC to –57 V DC
2.6 Physical Specifications
Table 2-13 Physical specifications
Item
Specification
Dimensions (height x width x length)
86 mm x 442 mm x 310 mm
Weight
≤ 12 kg (in full configuration)
≤ 7 kg (in typical configuration)
2.7 Environment Specifications
Table 2-14 Environment specifications
Item
Specification
Operating temperature
–20ºC to +55ºC (long-term)
+55ºC to +60ºC (short-term)
Relative humidity
5% RH to 95% RH
Protection class
IP20
Atmospheric pressure
70 kPa to 106 kPa
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3 Acronyms and Abbreviations
3
Acronyms and Abbreviations
Abbreviation
Full Name
ATM
Asynchronous Transfer Mode
BBU
Baseband Unit
BHCA
Busy Hour Call Attempts
BITS
Building Integrated Timing Supply System
CE
Channel Elements
CPRI
Common Public Radio Interface
DL
Downlink
DRB
Data Radio Bearers
EDGE
Enhanced Data rates for GSM Evolution
FE
Fast Ethernet
GE
Gigabit Ethernet
GL
GSM and LTE
GPS
Global Positioning System
HDLC
High-level Data Link Control
HSDPA
High Speed Downlink Packet Access
IC
Interference Cancellation
IP
Internet Protocol
LMT
Local Maintenance Terminal
LTE
Long Term Evolution
MAC
Media Access Control
MIMO
Multi-input and Multi-output
OC-3
Optical Carrier Level 3
Issue Draft A (2014-12-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
18
eRAN8.1 BBU3910 Description
3 Acronyms and Abbreviations
Abbreviation
Full Name
OM
Operation and Maintenance
OMC
Operation and Maintenance Center
QSFP
Quad Small Form-factor Pluggable
RGPS
Remote Global Positioning System
SMT
Site Maintenance Terminal
STM-1
Synchronous Transport Mode-1
TOD
Time of Day
UEIU
Universal Environment Interface Unit
UL
UMTS and LTE
UMTS
Universal Mobile Telecommunications System
UMPT
Universal Main Processing and Transmission Unit
UPEU
Universal Power and Environment Interface Unit
USCU
Universal Satellite card and Clock Unit
UTRP
Universal Transmission Processing Unit
Issue Draft A (2014-12-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
19