Wolfgang,
I do not know any reference installations personally but I heard good experiences with the DL 3800E from Digital Link. This one will inverse mux one HSSI/RS-499 into several (up to 8)  E1's (G.703/704/BNC/DB15) , also over a 250 ms hop. I do not know whether RS-449 is also supported instead of E1, but normally there should be a module for a satellite modem to give you that interface.
Seems to work well with CISCO's  (http://www.dl.com/relnot05.html and ciscoap.html).
Let me know whether you need more information, I have a full manual of the DL3800E here.
Regards, Frank
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Frank Zeppenfeldt
Ground Station Network Engineer
[email protected]
tel: +49 6151 807351
fax: +49 6151 807426
EUMETSAT
Ground Segment Division
Am Kavalleriesand 31
64295 Darmstadt
Germany
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