Just reading up on microwave link planning for university. When people speak of STM-1, E1, T1 etc., what are they referring to? Is it the data rate from the radio unit to the antenna? Or from baseband unit to the radio? etc?
When you hear about an E1, or an STM-1 interface, etc. people are referring at an interface, well defined through international standards, able to provide certain data rate. All these are well specified into international standards (for example if we' re talking about E1 interface, you should refer to ITU-T G.703 standard) where the physical interface is detailed (the kind of connector that can be used for interconnection, cabling information, etc.). On the other hand, many times when people are talking about E1, etc. they just mean the data rate, but actually this is not absolutely correct. E1, STM1, T1, etc. are interfaces and if you study the international standards associated with them, you will easily understant the data rate associated with them and all the other usefull details that may be required.
STM concerns SDH architecture as E1 and T1 concerning Sonet and PDH. STM-n has a throughput of n* 155 Mb/s.They can be considered as link standards or interfaces also.
STM concerning especially a fiber optic network. E1 and T1 concernes radio and linked networks as ISDN and PSTN (a E1 is european PCM frame at 2.048 Mb/s and T1 is american PCM frame at 1.55 Mb/s). For your case, you should have understand that is data having a certain throughput.
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