This chapter discussed the various ONS 15454 Ethernet interface cards, including the E-Series, G-Series, CE-Series, and ML-Series cards. These interfaces are used to provide highly reliable point-to-point or multipoint Ethernet transport services over SONET/SDH rings. The E-Series cards, which were the original ONS 15454 Ethernet interfaces, can be used for Layer 1 or Layer 2 services. However, these cards have been made largely obsolete by the newer card types and are typically found only in embedded networks. The E Series includes the E1000-2 and E1000-2-G for GigE connections, and the E100T-12 and E100T-G for 10-Mbps and 100-Mbps connections. The G-Series and CE-Series cards are used to provide Layer 1 point-to-point private line services for subrate and line-rate forwarding of Ethernet frames for 10-Mbps, 100-Mbps, and 1000-Mbps services. The G Series contains a single card, the G1K-4, and provides up to four ports of subrate and line-rate GigE services. The CE Series includes the CE-100T-8 card and is used to provision 10/100 Mbps services. The CE-100T-8 also supports priority queuing through inspection of the ToS and CoS bits. The ML-Series cards are used to provide Layer 2 and Layer 3 services. The ML Series includes the ML100T-12 (10/100Base-TX), ML100X-8 (100Base-FX and 100Base-LX10), and ML1000-2 (1000Base-SX and 1000Base-LX). The RPR network application using the ML-Series cards provides an efficient and resilient method of multipoint Ethernet transport in an optical network. The operation and configuration of RPR was discussed in detail in this chapter. |