TABLE OF CONTENTS The standards bodies were aggressively specifying and enhancing the various techniques, standards documents, and the implementations of the SONET and SDH architectures. These same bodies influence all the other networking standards, yet different committees are involved. The committees include representation from the list in Table 7-1.
| International Telecommunications Union (ITU) (www.itu.org) |
| American National Standards Institute (ANSI) (www.ansi.org) |
| Alliance for Telecommunications Industry Solutions (www.atis.org) |
| Telecommunications Industries Association (TIA) for Fiber Optics (FO) (www.tiaonline.org) |
| Bellcore/Telcordia Technologies (www.bellcore.com) |
| European Telecommunications Standards Institute (ETSI) (www.etsi.org) |
| Full-service access networks (FSAN) committees |
Ciena and Cambrian were the first to include DWDM in metropolitan networks. These DWDM ring systems can be connected with ATM switches and IP routers. ATM networks will use SONET/SDH physical layer interfaces at 622 Mbps using add-drop multiplexers.
The industry anticipated that the SONET equipment makers would make reliable OC-192 (10-Gbps) systems or face stiff competition from DWDM manufacturers, setting the stage for a new wave of competition. Actually, the SONET/SDH manufacturers jumped on the WDM bandwagon with their own products. The major SONET/SDH and WDM systems manufacturers include the vendors shown in Table 7-2.
| ADC Telecommunications |
| Alcatel |
| Artel Video Systems, Inc. |
| Bosch Telecom, Inc. |
| Cambrian |
| Ciena Corporation |
| Ericsson |
| Fujitsu |
| Hitachi Telecom |
| Lucent Technologies, Inc. |
| NEC America, Inc. |
| Nortel Networks |
| Osicom Technologies Inc. |
| Pirelli Cable Corporation |
| Scientific Atlanta |
| Siemens Telecom Networks |
| Tellabs, Inc. |
| Tellium |
Not everyone makes full systems; some make...
