Typically the price to lease a DS3 (28 DS1s) is near the price to lease 6 or 7 DS1s individually, which drives the need for SONET or DS3 fiber to the cell site as mobile services drive backhaul traffic to higher and higher levels. M13 or SONET/SDH multiplexer solutions are then placed at either end of the higher rate optical backhaul connection. This is at the cell site and mobile exchange. Multiplexer solutions then break out the required DS1 services from the DS3 or OC3 transport.
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