Schmid Watson Specifications download pdf (Page 61)

Watson-TDM-Manual-W.doc

Version 2.0-01

Watson TDM

Operating Manual

Revision: 2008-02-07 5-3

Note:

If a remotely powered tabletop modem consumes more power than can be fed

over the DSL link then it will not start up properly. This can lead to the loss of a

remote modem through misconfiguration, e.g. by enabling the nx64 interface on

a multiservice modem which is operating at the power limit with the nx64 inter-

face switched off. With such reconfigurations the power consumption of the mo-

dem increases and it will not work properly anymore, making it impossible to get

back to a working configuration under remote control. In such cases manual in-

tervention at the site of the remote modem is required to reconfigure the unit with

a local terminal.

The reach attainable with remote powering depends on the power consumption

of the modem and on the loop resistance (wire diameter and cable length and re-

sistance of the feeding/protection circuitry in the plug-in).

5.3.2 Remote powering of Tabletops

The tabletops have a backplane switch to select local or remote powering. In the

default switch position "REM" the tabletop modem is powered via the DSL line

and will start operation immediately after connection of the DSL line. In position

"LOC", the tabletop modem is powered locally and needs to be connected to a

power supply to operate.

5.3.3 Powering Status Display

The current powering status of a tabletop modem is available in the STATUS dis-

play of the monitor (Unit Power Source UPS):

UPS = 01 for local powering

UPS = 02 for remote powering

5.3.4 Power Failure Alarm

The power supply bit fbit3 of the DSL frame is used to indicate the status of the

local power supply in the tabletop modem. The power status bit is set to ONE if

power is normal and to ZERO if the power has failed. In case of power loss at the

remote modem there is enough power left to communicate three "Power Loss"

messages towards the LTU. In case of a failure of the tabletop modem power

supply, both LEDs will be extinguished.

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 129 130

No comments

Schmid Watson Specifications Page 61