3. RNC Products (P7)
RNC 3810 – the first generation Ericsson RNC
Throughput limited to approx. 1 200 Mbit/s due to inter subrack
communiction bottleneck
Power feeding limited to 800 W per subrack
RNC 3820 – the second generation Ericsson RNC
Modified architecture for increased throughput (2-4 Gbit/s),
e.g. introduction of 10 GE switching infrastructure between and within
subracks
Power feeding increased to 2 400 W per subrack for introduction of high
capacity hardware
4. RNC -3820 Cabinet
The letters in the figure above denote the
following:
•A— ES
•B— MS
•C — Active Patch Panel (APP)
5. RNC 3820 Maximum Configuration
Fan unit 2
Extension Subrack 1
Main Subrack
Active Patch Panel
Extension Subrack 2
Main Cabinet
Fan unit 1
6. Main
Subrack
Air intake
Fan unit
High Capacity Subrack
(HCS)Fan unit
Extension
Subrack 1
Air intake
Fan unit
Fan unit
Extension
Subrack 2
Air intake
Fan unit
Fan unit
Cabinet Layout
BYB 501
• 1 - 3 High Capacity Subracks
Same mounting as for RNC 3810
Active Patch Panel
Active Patch Panel
Connection Fields
7. RNC 3820 Node Layouts Examples
RNC 3820 – 110
MS
ES-1 (S1)
ES-2 (S2)
RNC 3820 – 70
MS
ES-1 (S1)
RNC 3820 – 30
MS
Throughput: 550 Mbps 1 350 Mbit/s 2 000 Mbit/s
Connectivity: 256 Iub Links 768 Iub Links 768
Iub Links
768 cells 2 304 cells 2 304 cells
Node Size: A B C
8. GPB- General Purpose Processor Board
The GPB operates as a Main Processor (MP). It contains and executes the main part of the RNC
software.
In the MS, four GPB pairs are duplicated to provide redundancy
SCB – Switch Core Board
Cell switch core functionality
Circuits for System Clock (19.44 MHz) distribution
Interfaces for node-internal links
Interfaces for fan supervision and control
Interfaces for GPS information
Power filtering and distribution
Over-temperature protection for subracks
TUB – Timing Unit Board
Interface for external clock input (an alternative to the transmission clock)
Interface for GPS signal input
Generation of reference timing signals
Regeneration of reference timing signals
Stabilization of reference timing signals
Handling of node synchronization procedures
System Clock oscillator (19.44 MHz)
9. SPB – Special Purpose Board
- Packet Data Router (PDR), terminates the GTP-U protocol towards the Packet CN.
- Common Channel, terminates configured radio channels, for example FACH.
- Dedicated Channel, terminates dynamic radio channels, for example DCH, with or without HW
acceleration.
- Point to multipoint - Iu, MBMS stream multicasting between subracks.
- Point to multipoint - Iub, MBMS stream multicasting towards RBSs, runs with DCH application
ET Boards – Exchange Terminal Board
- The following are different versions of the ET boards that implement adaptations to
different physical media and transmission standards:
- 155 Mbps (STM-1 and OC3c), optical link – ET-MF4
- 155 Mbps (STM-1 and OC3c), channelized (VC-11 and VC-12) optical link — ET-
MF41
- 1 Gbit Ethernet. The board also serves as an ATM to Ethernet gateway — ET-IPG
- 10Gbit Ethernet (eight Ethernet ports on front panel) The board is also used for high
capacity connections between subracks — CMXB
The CMXB is an Ethernet switch board used both for internal and external transport in the RNC
and for all external IP traffic.
The board is equipped with twelve 10G ports in the backplane for internal communication
between boards in the subrack, and eight 10G ports in the front for inter-subrack communication
through Ethernet Subrack Links (ESL).
CMXB
10. 6.1 Iu
The Iu is the interface between the RNC and Circuit-Switched (CS) or Packet-Switched (PS) CN. The Radio
Access Network Application Part (RANAP) protocol is used for traffic-related control signalling to the CS and
PS CN, and for GTP-U protocols to the PS CN. User plane and signalling over Iu may use ATM or IP.
6.2 Iur
The Iur is the interface between two RNCs. This interface carries the Radio Network Subsystem Application
Part (RNSAP), used for traffic-related control signalling. For user data, Frame Protocols are used. User plane
and signalling over Iur may use ATM or IP).
6.3 Iub
The Iub is the interface between the RNC and an RBS. This includes the Node B Application Part (NBAP),
used for traffic related control signalling. For user data, Frame Protocols are used. User plane and signalling for
an RBS may use either ATM or IP.
6.4 Uu
The Uu is the air interface between the UE and the network. The interface is divided into three layers and the
different layers terminate in different nodes as follows:
Layer 1 terminates partly in the RBS and partly in the RNC.
Layer 2 terminates mainly in the RNC.
Layer 3 terminates mainly in the RNC, but with many messages are transparently transferred between the UE
and the CN by the RNC. Broadcast Channel (BCH) terminates in the RBS.
6.5 Mur
The Mur management interface provides element and network management of the RNC. Users of the interface
