DT Etherlink IV User Manual- 16 -WARNINGDISCONNECT THE CABLE ON THE SHDSL LINE INTERFACE ANDREMOVE THE LOCAL POWER SUPPLY BEFORE SETTING ANY JUMPEROR TOUCHING ANYTHING INSIDE OF A NTU ENCLOSURE.Figure 3.3 Default Jumper position and LP/DP switch position3.2.2 Description of Etherlink_IV Interfaces3.2.2.1 SHDSL InterfaceThe Etherlink_IV devices are available with 1, 2 or 4 SHDSL interfaces. The interfaces can operatefully independent of each other as well as they can be combined to operate in multipair mode.Therefore all independent SHDSL interfaces and groups of SHDSL interfaces (multipair mode) canbe configured separately from each other. The multipair mode, the reservation mode and theautomatic configuration detection mode naturally limit the independent working.All SHDSL interfaces support plesiochronous data transmission. It means that reference clockfrequencies, which are used to clock data transmission, are transmitted together with the data indifferent directions of one SHDSL link. The clock frequencies of different SHDSL channels arecompletely independent if they do not operate in the multipair mode.An SHDSL channel working in the independent mode can simultaneously transmit one or several E1streams, Nx64 or RS-232/485 data and one WAN stream. E1This transmission is plesiochronous.All E1 streams received by one SHDSL interface should use the same clock frequency in onedirection.XM39XM38XM41XM40LD/DP
