Ericsson Minilink » History » Revision 6
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= Ericsson Mini-Link =
Ericsson Mini-Link is a series of commercially very successful microwave links.
They are used world-wide for back-hauling GSM BTS and UMTS Node-B, i.e. for the
A-bis and IuB-links.
Every microwave link is a point-to-point link.
Each side of the link has an IDU (In Door Unit) and ODU (Out Door Unit).
=== IDU (MMU) ===
The IDU is responsible for transmitting and receiving at the respective microwave frequency (normally 7...38GHz).
In the Mini-Link system they are most commonly they are called MMU.
There are different types of MMUs, representing the different link speeds of the microwave link, e.g. * MMU 34+2 (1 E3 link at 34 Mbps plus 1 E1 link for mgmt) * MMU 4x2 (4 E1 links at each 2 Mbps)
The MMU has connections for the data links (E1, E3, STM-1, etc.) as well as a coaxial wire connecting it with the
You can see photographs of the interior of a MMU in the following album: http://laforge.gnumonks.org/photoalbum/devices/ericsson_minilink/mmu_34_2/index.html
=== SMU ===
The SMU is a unit that aggregates SDH links, e.g. the SAU 16x2 aggregates 16 E1 links into one E3
The SAU can control various site-local digital input and outputs throug the management link.
=== ODU (RAU) ===
The ODU is contains the actual modem that modulates the E1, E3 or STM-1 link onto the IF (Intermediate Frequency)
which is put on the coaxial link towards the ODU.
Conversely, on a different IF, there is the down-link from the ODU towards the demodulator/decoder in the IDU.
In the Mini-Link system, the ODU is commonly called RAU (Radio Access Unit).Hardware Information
=== IF-Link between IDU and ODU ===
There are three intermediate frequencies (IFs) that are being used: * Uplink IF at 350 MHz * Downlink IF at 140 MHz * Control IF at low frequency
=== RAU ======= 7 GHz ====
|1||RAU1 N 7/11||7426-7484||Jolly|
|1||RAU 15/13||14709.25-14823||LaForge (D)|
|1||RAU 15/16||15024.25-15138||LaForge (D)|
|1||RAU2 L 23/76||22002.75-22288||Jolly|
|1||RAU2 N 23/76||22002.75-22288||Jolly|
|1||RAU2 M 23/77||22288-22590.75||LaForge|
|1||RAU2 M 23/79||23296-23598.75||LaForge|
|2||MMU 4+2/8||LaForge (D)|