PDF user manual for CopperEdge 150

'6/,08;For subscriber endpoints equipped with the appropriate CPEs,the CE150 supports a technique called Inverse Multiplexing, orIMUX, in which multiple DSL ports are designated as membersof a bundle, and treated as a single logical DSL port. The IMUXlogical port and its DSL Multilink (multiple copper pairs originatingat different physical DSL ports on the CE150, but terminatingat a common endpoint CPE) combine to cumulativelyincrease both the bandwidth and the throughput of a single DSLlink. Thus, an IMUX bundle containing two SDSL ports, each setat 1,568 Kbps, has a theoretical throughput of 3,136 Kbps. Asmall portion of the total, however, is reserved for managementoverhead. IMUX links may be either IDSL or SDSL, provided theyare matched with the appropriate CPE and line module type.In the current release, the CE150 supports two DSL ports inone bundle. But the application is capable of supporting fourportIMUX bundles in software.With few exceptions, IMUX bundles are treated in the same wayas any other DSL port. Each bundled port is designated with itsown PII and assigned to a logical slot 51, such as 1.51.3.1 2 7 (Only IMUX-capable CPEs can be assigned as endpoints of an IMUXbundle; if a regular (single link) CPE is designated as the endpoint ofan IMUX bundle and the CPE attempts to train, the connection will failand the CE150 will generate an alarm. Moreover, any mismatch orconflict between the ports in an IMUX bundle and the bundle’sendpoint CPE will result in an alarm condition.In the following diagram, two-port DSL bundles are shown connectingthe CE150 to separate IMUX CPEs. For contrast, twostandard, single-port links are shown with their standard CPEs.LANLANRouter,SwitchingHub,Etc.Router,SwitchingHub,Etc.HostDevice10BaseT10BaseT10BaseTIMUXCPEMultilinkIMUXCPEMultilinkSingle LinkCPEdsldslMultilink BundledsldslMultilink BundleCE200MultiLinkDSL PortsDSL PortsDSL PortsPacket ForwardingWANHostDevice10BaseTSingle LinkCPEDSL Multilink (IMUX) Concept&KDSWHU$GYDQFHG&RQILJXUDWLRQ