Specifications

Watson-TDM-Manual-W.doc
Version 2.0-01
Watson TDM
Operating Manual
Revision: 2008-02-07 3-5
Monitor setting
BACKOFF ON
in STU-C
STU-C STU-R
Regenerator has no BACKOFF setting.
Transmit power STU-C --> Regenerator
never reduced
Regenerator
Transmit power
Regenerator --> STU-C reduced
Transmit power
Regenerator --> STU-C reduced
Regenerator has no BACKOFF setting.
Transmit power STU-R --> Regenerator
never reduced
Monitor setting
BACKOFF ON
in STU-R
Figure 3-2: Power backoff with regenerator
3.1.6 Wetting Current
The remote powering circuit of a plug-in modem can be used to inject a wetting
current on the DSL link:
• To use wetting current enable remote powering on the plug-in modems
(Monitor command POWER ON) and use local powering for the tabletop mo-
dems.
• On the tabletop modems sinking of wetting current must be enabled with the
WETTING monitor command, see 0
3.2 E1 Interface
3.2.1 Framing
Transparent Mode
In transparent mode, the E1 signal is transmitted without any changes.
The “CRC4 “ and “E-bit Insertion” options are not relevant in transparent mode.
Framed Mode ITU-T G.704
In framed mode (framing according to ITU-T G.704), the E1 stream passes
through an E1 framer before entering the DSL section, and the E1 stream re-
ceived from the DSL section first passes through the E1 framer before being
transmitted to the E1 network.
The E1 framer operates in Common Channel Signaling (CCS) mode. Timeslot 16
and all national bits are fully transparent.