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How to Identify T-Mobile network equipment (Ericsson)

lilotimz

By lilotimz
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lilotimz Member Level: LTE Advanced

lilotimz

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T-mobile Ericsson Cell Equipment

 

For Ericsson markets t-mobile uses what is known as AIR antenna units which have the radio unit integrated with the antenna. This type of setup significantly reduces signal loss from the radio to the antenna since they're both practically next to each other and not sepearated by coax jumper cables like that of a remote radio unit.

 

Basic Ericsson AIR21 setup

(Note typically there are 2 Ericsson AIR per sector)

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Ericsson AIR21 + Band 12 700 mhz Equipment

 

Note the addition of a new low band 700 mhz capable antenna + Ericsson RRUS11 B12 (remote radio units) in addition to new TMA (tower mounted amplifiers) connected to the AIR antenna. The new Ericsson RRUS11 B12 + Antenna addition is for tmobiles band 12 700mhz (L700) deployment. 

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(Credit: tmo.rocks)

 

Credit for the photographs belong to whoever took it. You know who you are! :)

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atomic50 Member Level: iDEN *chirp*

atomic50

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Glad to see you like my photo [i got lots more ;)] Here is my related post from another thread:

 

 

For Ericsson AIR21 sites, there is currently one active PCS HSPA+/GSM and passive AWS HSPA+ plus one active AWS LTE and passive mid-band empty. 

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mozamcrew Member Level: eHRPD

mozamcrew

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Why is Sprint not using the Air antenna type?

 

Was not commercially available and does not support CDMA. 

 

Originally, the radios were inside the cabinets on the ground. Power and data cables flow into the radios, and a broacast signal flows out to the antennas over coaxial cables. As soon is this happens, you have signal attenuation and an opportunity to introduce interference. An RRU lets you move the radios out of the cabinet and closer to the antenna, thus reducing the attenuation. The AIR antenna effectively builds the RRU into the antenna, making the effective distance almost zero.

 

Now an RRU can give you 98% of that benefit, if you mount the RRU right next to the antenna. Or you can mount the RRU further away from the antenna (maybe the structure can't support that much weight at that height), but you introduce more signal attenuation/interference the further from the antenna you move it. So you get some additional flexibility using that setup. But it does make the setup a little more complicated, and there may be some benefits in terms of total weight or wind loading by combining the RRU and antenna into a single unit. So there are pros and cons to doing AIR vs antenna and RRUs. But naturally if it wasn't available at the time and doesn't support CDMA then it wasn't an option for Sprint.

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