james@csd4.csd.uwm.edu (Jim Lowe) (06/05/90)
Our local TV people are in the process of setting up a microwave link here on campus. They are looking at 23 Ghz systems. I would like to be able to add IP traffic to their setup. As I understand things, the 23 Ghz systems use a 10 Mhz bandwidth. DC to 4.5 Mhz is used for the video signal. They usually put the audio signal at 6.2 Mhz with a 75 Khz deviation. They also use 5.8 Mhz (not so good of an audio channel due to synch buzz) and have second audio channels at 6.8 and 7.5 Mhz. They said we could use one of the second audio channels to run data on -- using modems at 56kbps. Personally I would like to use T1 or T2 which should fit in the extra bandwidth. Unfortunatly the manufacture (Macom) doesn't offer any T1 capablility -- as far as we know. It seems that where we want to have data they want to have video and visaversa. It would be real nice if we could find a microwave system that did video, audio, and at least one T1. If you have any experience with running data over microwave links with video I would like to hear from you. I would be interested in any horror stories, actual setups that you are using, manufactures of equipment, etc... Thanks, -Jim james@csd4.csd.uwm.edu -- - Jim Internet: james@uwm.edu Uucp: uwm!james Bitnet: james%uwm.edu@INTERBIT Telephone: +1 (414) 229-6431 USmail: Computing Services Division, P.O. Box 413, Milwaukee, WI 53201
kwe@bu-it.bu.edu (Kent England) (06/06/90)
In article <4297@uwm.edu>, james@csd4.csd.uwm.edu (Jim Lowe) writes: > > Our local TV people are in the process of setting up a microwave link > here on campus. They are looking at 23 Ghz systems. I would like to be able > to add IP traffic to their setup. > > ... > They said we could use one of the second audio channels to run > data on -- using modems at 56kbps. Personally I would like to use T1 or T2 > which should fit in the extra bandwidth. Unfortunatly the manufacture (Macom) > doesn't offer any T1 capablility -- as far as we know. > > It seems that where we want to have data they want to have video and > visaversa. It would be real nice if we could find a microwave system that > did video, audio, and at least one T1. > It can be tough sharing bandwidth between two separate organizations. But it is doable, since we have done it on a campus broadband system. Rather than try to shoehorn data into TV bandwidth, what if you got separate service? You could share the antenna (using dual feed), but then you could get your own non-competing bandwidth for data. The advantage is that you could buy Ethernet-on-microwave gear and get 10Mbps for less than the cost of T1. That way you wouldn't have to try to run your LAN service on someone else's mux gear. Keep it simple. Since it is a private network, you have no technical reason to adhere to telco standard interfaces. Kent England Boston University