28 E1s or 768 DS3s 256 E4S www.TechnicalPDF.com *SONET was developed to aggregate (multiplex) and carry TDM (Time Division Multiplexed) and circuit-switched voice traffic from multiple sources. The international version of SONET is Synchronous Digital Hierarchy (SDH). SONET SDH carries traffic at Synchronous Transfer Mode (STM) rates. Table 4-3 Older PON Standards 10G-EPON Broadband Gigabit Gigabit Ethernet PON Ethernet PON 622Mbps* 622Mbps* 2.5Gb 10 Gbps (OC 12) upstream and downstream downstrea downstream downs tream 1Gbps upstream 155Mbps* Or Symmetric (OC 3 3) 10Gbps upstream and downstream upstream upstre Earliest A faster Efficie Symmetric suited version of nt for for commercial standard customers traffic *Optical carrier Table 4-4 DOCSIS Standards Standard Capabilities Two-way service for Internet access. Upstream speed of 5Mbps. Uniform specifications SO that cable modems can be purchased from retail outlets that are compatible with cable operators' infrastructure. Increases the upstream speed to 10Mbps. www.TechnicalPDF.com Improves security and privacy. QoS enables operators to provide differentiated quality for VoIP and interactive services such as real time multiplayer games. Tier-based services such as higher speeds to heavy users who use more bandwidth or purchase additional data service. Increases upstream capacity to 30Mbps. Symmetric services such as those for business customers. Peer-to-peer such as VPN with site-to-site connectivity (see Chapter 5 for further information on VPN service). Supports higher capacity of 173Mbps to 343Mbps downstream to homes, 123Mbps upstream to the cable operator, and bonding. DOCSIS 3.0 includes support for IPTV. www.TechnicalPDF.com 5. Broadband Network Services In this chapter: Introduction VoIP Calling Services over Broadband Multi-Protocol Label Switching for Interoffice Connections IP Virtual Private Networks over the Internet Adding Security on Traffic Sent over IP VPNs Managed Services Digital Subscriber Line-Distance Limitations; Operates on Copper Cabling