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'''NOTE: All information here is collected by us, we have no contact or affiliation with Ericsson. We have no idea how accurate our information-gathering has been.'''

= 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

=== SAU ===

	Qty		Type		Owner
	1		SAU 1 Exp		LaForge

=== Other (Not Ericsson) ===

	Qty		Type		Owner
	2		RAD 34M/E1		Jolly