Specifications

Watson-TDM-Manual-W.doc
Version 2.0-01
Watson TDM
Operating Manual
Revision: 2008-02-07 8-11
PRA option
Select the ISDN PRA functional entities of the modem:
PRA OFF no PRA function (transparent transmission)
PRA NT1LT both NT1 and LT
PRA LT only LT
PRA NT1 only NT1
8.2.7 n x 64 kbit/s configuration
BITRATE rate
Set bitrate of the nx64 Port : n = 1 .. 156 (64 Kbps .. 9'984 Kbps)
To switch off the nx64 Port, set bitrate to 0.
Warning:
If a multiservice tabletop modem is remotely powered be sure not to enable the
nx64 kbit/s interface (by setting BITRATE to a value > 0) if the modem is operat-
ing at the remote power limit with just the E1 interface enabled. Due to the
higher power consumption of the nx64 kbit/s interface the current limiter at the
plug-in might operate, thus switching off remote power feeding. Subsequent
startups will not be successful. The system will not operate until the tabletop
modem is reconfigured locally.
BYTETIMING ON | OFF
Select whether or not circuit B for byte timing is used in X.21 mode. Note that to
use byte timing you need the appropriate cable and cannot use the co-directional
transmit clock.
This command is only available in X.21 mode.
CLOCKDIR direction
Select clock direction: 0 = codirectional, 1 = contradirectional.
This command is only available in V.35 and V.36 modes.
CLOCKMODE source
Select clock source: 0 = nx64 Port, 1 = E1 Port 2, 2 = Internal, 3 = Remote.
CLOCKPOL polarity
The CLOCKPOL command selects the sampling instant for the incoming data
stream on circuit T of the X.21 user interface. In normal configuration
(CLOCKPOL 0) circuit T is sampled on the rising edge of clock S. The data transi-
tions on T and R occur at the OFF to ON transition of S (according X.24). The ON
to OFF transition of circuit S nominally indicates the center of each signal ele-
ment, in this case on circuit R.
When Clock Polarity is set to inverted (CLOCKPOL 1), circuit T is sampled with
the falling slope of S and the incoming data at X.21 circuit T is sampled at the
OFF to ON transition of S.
This command is only available in X.21 mode.