DT Etherlink IV
User Manual
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WARNING
DISCONNECT THE CABLE ON THE SHDSL LINE INTERFACE AND
REMOVE THE LOCAL POWER SUPPLY BEFORE SETTING ANY JUMPER
OR TOUCHING ANYTHING INSIDE OF A NTU ENCLOSURE.
Figure 3.3 Default Jumper position and LP/DP switch position
3.2.2
Description of Etherlink_IV Interfaces
3.2.2.1 SHDSL Interface
The Etherlink_IV devices are available with 1, 2 or 4 SHDSL interfaces. The interfaces can operate
fully 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) can
be configured separately from each other. The multipair mode, the reservation mode and the
automatic configuration detection mode naturally limit the independent working.
All SHDSL interfaces support plesiochronous data transmission. It means that reference clock
frequencies, which are used to clock data transmission, are transmitted together with the data in
different directions of one SHDSL link. The clock frequencies of different SHDSL channels are
completely independent if they do not operate in the multipair mode.
An SHDSL channel working in the independent mode can simultaneously transmit one or several E1
streams, 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 one
direction.
XM39
XM38
XM41
XM40
LD/DP
