Yes, that's a perfectly valid address.
The street is 'Av. de las Telecomunicaciones' (ie, Telecom Avenue).
S/N means 'sin numero', ie house/location without a number - common in industrial areas.
Conjunto CONTEL most likely denotes a business park-like location, Mexican-style of course.
Col. is 'colonia', which means neighborhood
'Delegacion' denotes the political subdivision of the Federal District (DF)
Wikipedia will show you that the place you're looking for is in south-eastern Mexico City.
They didn't give you a postal code, but there certainly is one, and it will start with 09 (09XXX).
Add: here's the
Guia Roji map. You're looking for squares 098_D6 and 098_E6.