Ericsson Minilink » History » Revision 5
Revision 4 (jolly, 02/19/2016 10:52 PM) → Revision 5/9 (admin, 02/19/2016 10:52 PM)
[[PageOutline]] = 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 ODU. 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 http://laforge.gnumonks.org/photoalbum/devices/ericsson_minilink/smu_16_2/index.html === SAU === The SAU can control various site-local digital input and outputs throug the management link. http://laforge.gnumonks.org/photoalbum/devices/ericsson_minilink/sau_exp1/index.html === 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 == Mini-Link Equipment that we have == === RAU === ==== 7 GHz ==== ||Qty||Type||Tx (MHz)||Owner|| ||1||RAU1 N 7/11||7426-7484||Jolly|| ==== 15 GHz ==== ||Qty||Type||Tx (MHz)||Owner|| ||1||RAU 15/13||14709.25-14823||LaForge (D)|| ||1||RAU 15/16||15024.25-15138||LaForge (D)|| ==== 18 GHz ==== ||Qty||Type||Tx (MHz)||Owner|| ||1||RAU1 18/11||17706.5-18009.5||LaForge|| ||1||RAU1 18/15||18716.5-19019.5||LaForge|| ==== 23 GHz ==== ||Qty||Type||Tx||Owner|| ||1||RAU 23/56||22002.75-22513.75||Jolly|| ||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|| ==== 26 GHz ==== ||Qty||Type||Tx (MHz)||Owner|| ||1||RAU 26/24||24995.25-25445||LaForge|| ||1||RAU 26/29||26003.25-26453||LaForge|| ==== 38 GHz ==== ||Qty||Type||Tx (MHz)||Owner|| ||1||RAU 38/12||37338-37619.75||Jolly|| ||1||RAU 38/16||38598-38879.75||Jolly|| === MMU === ||Qty||Type||Owner|| ||3||MMU 34+2||LaForge|| ||6||MMU 34+2||Jolly|| ||3||MMU 155/16||Jolly|| ||3||MMU 155/128||Jolly|| ||2||MMU 4+2/8||LaForge (D)|| === SMU === ||Qty||Type||Owner|| ||2||SMU 16x2||LaForge||