offer ATM circuits that provide the same data transmission rates as SONET: 51.84 Mbps,466.56 Mbps, 622.08 Mbps, and so on. New versions called T-1 ATM (1.544 Mbps) and T-3ATM (45 Mbps) are also available.Switched Multimegabit Data Service (SMDS) is an unreliable packet service like ATM andframe relay. SMDS encapsulates incoming packets from the user's network with ATM-like 53-byte cells, although the address is different than an ATM address. The user's data link layeraddress is mapped to the SMDS address, which is used for transmission through the SMDSnetwork. The SMDS cell is stripped off at the destination and the user's data link layer packet9-12
Chapter 9
23. Which likely to be the longer term winner, X.25, frame relay, ATM, SMDS, or Ethernet services?
