User Manual NTU Orion 2
17
Figure 3.4. Position of the switch of LP/DP modes on the NTU board.
Regenerators having the XCVR mechanic design are always powered remotely.
The default setting are:
• for NTUs of the Stand Alone type, the switch is in the LP position (local powering);
• for NTUs in the IP and PL housings, the switch is in the DP position (remote powering);
3.3.2 Description of FlexDSL Orion 2 interfaces
3.3.2.1 xDSL interface
The operation modes described below refer to the line interface of the device.
The FlexDSL Orion2 devices can have 1, 2 or 4 xDSL interfaces. The interfaces can operate
independently of each other as well as can be combined to operate in the multipair mode.
All independent xDSL interfaces and groups of xDSL interfaces operating in the multipair mode
can be configured separately from the other xDSL interfaces. The multipair mode, the
reservation mode and the mode of automatic configuration detection naturally limit independent
functioning of the interfaces.
All interfaces support the plesiochronous data transmission. It means that reference clock
frequencies, which are used to clock data transmission, can transmit data in different directions
in one xDSL link.
The clock frequencies of different xDSL channels are completely independent if they do not
operate in the multipair mode.
If the xDSL channel is configured to operate in the independent mode (normal settings), it can
simultaneously transmit one or several E1 streams and one WAN stream. This transmission is
plesiochronous. All E1 streams received by one DSL interface should use the same clock
frequency in one direction.
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