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Ericsson Minilink » History » Version 5

admin, 02/19/2016 10:52 PM
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[[PageOutline]]
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= Ericsson Mini-Link =
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Ericsson Mini-Link is a series of commercially very successful microwave links.
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They are used world-wide for back-hauling GSM BTS and UMTS Node-B, i.e. for the
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A-bis and IuB-links.
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Every microwave link is a point-to-point link.
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Each side of the link has an IDU (In Door Unit) and ODU (Out Door Unit).
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=== IDU (MMU) ===
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The IDU is responsible for transmitting and receiving at the respective microwave frequency (normally 7...38GHz).
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In the Mini-Link system they are most commonly they are called MMU.
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There are different types of MMUs, representing the different link speeds of the microwave link, e.g.
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 * MMU 34+2 (1 E3 link at 34 Mbps plus 1 E1 link for mgmt)
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 * MMU 4x2 (4 E1 links at each 2 Mbps)
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The MMU has connections for the data links (E1, E3, STM-1, etc.) as well as a coaxial wire connecting it with the
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ODU.
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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
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=== SMU ===
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The SMU is a unit that aggregates SDH links, e.g. the SAU 16x2 aggregates 16 E1 links into one E3
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http://laforge.gnumonks.org/photoalbum/devices/ericsson_minilink/smu_16_2/index.html
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=== SAU ===
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The SAU can control various site-local digital input and outputs throug the management link.
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http://laforge.gnumonks.org/photoalbum/devices/ericsson_minilink/sau_exp1/index.html
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=== ODU (RAU) ===
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The ODU is contains the actual modem that modulates the E1, E3 or STM-1 link onto the IF (Intermediate Frequency)
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which is put on the coaxial link towards the ODU.
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Conversely, on a different IF, there is the down-link from the ODU towards the demodulator/decoder in the IDU.
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In the Mini-Link system, the ODU is commonly called RAU (Radio Access Unit).
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== Hardware Information ==
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=== IF-Link between IDU and ODU ===
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There are three intermediate frequencies (IFs) that are being used:
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 * Uplink IF at 350 MHz
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 * Downlink IF at 140 MHz
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 * Control IF at low frequency
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== Mini-Link Equipment that we have ==
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=== RAU ===
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==== 7 GHz ====
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||Qty||Type||Tx (MHz)||Owner||
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||1||RAU1 N 7/11||7426-7484||Jolly||
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==== 15 GHz ====
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||Qty||Type||Tx (MHz)||Owner||
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||1||RAU 15/13||14709.25-14823||LaForge (D)||
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||1||RAU 15/16||15024.25-15138||LaForge (D)||
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==== 18 GHz ====
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||Qty||Type||Tx (MHz)||Owner||
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||1||RAU1 18/11||17706.5-18009.5||LaForge||
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||1||RAU1 18/15||18716.5-19019.5||LaForge||
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==== 23 GHz ====
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||Qty||Type||Tx||Owner||
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||1||RAU 23/56||22002.75-22513.75||Jolly||
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||1||RAU2 L 23/76||22002.75-22288||Jolly||
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||1||RAU2 N 23/76||22002.75-22288||Jolly||
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||1||RAU2 M 23/77||22288-22590.75||LaForge||
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||1||RAU2 M 23/79||23296-23598.75||LaForge||
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==== 26 GHz ====
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||Qty||Type||Tx (MHz)||Owner||
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||1||RAU 26/24||24995.25-25445||LaForge||
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||1||RAU 26/29||26003.25-26453||LaForge||
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==== 38 GHz ====
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||Qty||Type||Tx (MHz)||Owner||
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||1||RAU 38/12||37338-37619.75||Jolly||
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||1||RAU 38/16||38598-38879.75||Jolly||
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=== MMU ===
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||Qty||Type||Owner||
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||3||MMU 34+2||LaForge||
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||6||MMU 34+2||Jolly||
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||3||MMU 155/16||Jolly||
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||3||MMU 155/128||Jolly||
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||2||MMU 4+2/8||LaForge (D)||
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=== SMU ===
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||Qty||Type||Owner||
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||2||SMU 16x2||LaForge||
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