System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Remote power supply
Aastra Proprietary Information Page 5-9
5.4 Remote power supply
The SDSL repeaters used in the SDSL line equipment can be remotely
powered by the RPS-XMP1 remote power supply module or a local power
supply.
The RPS-XMP1 remote power supply module (05HAT00071AAN) provides
four remote supply voltages of -116 V. In the XMP1 subrack, this module is
mounted in a card slot adjacent to the ISHDSL module.
The SHDSL repeaters are fed with the remote supply voltage for the SDSL
link via the signal wires. The RPS-XMP1 remote power supply module
permits up to three SHDSL repeaters (05HBA00123AAD) to be remotely
powered from each side of the SDSL link. The RPS-XMP1 and ISHDSL
modules are interconnected by means of the RPS-XMP1 connecting cable.
The SDSL link can be remotely powered both from the LT and NT side.
Remote powering is activated in the LT or NT via the operator software.
SHDSL repeaters
• can be remotely powered via the signal wires from the LT or NT
direction;
• pass on the remote supply voltage to the next SHDSL repeater;
• can be locally powered via an external mains adapter.
The required supply option can be adjusted by means of jumpers in the
SHDSL repeaters.
Figure 5.3: Remote powering
The powering range is limited by the ohmic loop resistance of the line. On
lines with a wire diameter
1.2 mm, the powering range with two repeaters
being remotely powered (1 pair) is normally higher than the maximum SDSL
transmission range possible. In case of a wire diameter of 0.9 mm, one
repeater can be remotely powered without any restriction. However,
powering of a second repeater via the signal wires depends on the field
length.
LT
1 2 3 n 6 7 8
NT
E1 E1
Remote powering Remote powering
Local powering
Reg. Reg. Reg. Reg. Reg. Reg. Reg.
Operator SW:
RPS on/off
Operator SW:
RPS off/on
Adjust powering mode by
means of jumpers