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COMSPHERE 3550 Series Data Service Units
5-12 February 1995 3550-A2-GB20-10
Table 5-6
(1 of 4)
DBM Configuration Options
Rate(Kbps): 9.6
Next 14.4 12.0 9.6 4.8 2.4 Prev
DBM Rate
. Sets the initial data rate (in kbps) of the DBM for backup calls over the dial circuit.
14.4 to — Select the data rate for V.32bis modulation. The rate 14.4 is not displayed if you have a 12.0 kbps DBM.
4.8 kbps
2.4 — Select for V.22bis modulation.
PrtSp(Kbps): 9.6
Next 14.4 12.0 9.6 4.8 2.4 1.2 Disab Prev
Port Speed
(not displayed with a TDM/Flex installed and enabled). Sets the speed of the DTE port interface. The port
speed is set to any value
less than
or
equal to
the DBM Rate(Kbps) set above. The DBM performs rate adaption if set to
less than
the DBM port rate.
14.4 to — Select the port speed for the DBM; 14.4 will not appear for a 12.0 kbps DBM.
1.2 kbps
Disab — Select disable to set the port speed to 0.
TxClkSource: Int for a control DBM; RXC for a tributary DBM
Next Int RXC Ext Prt1 Prt2 DSU Prev
Transmit Clock Source
. Specifies the transmit timing source for the DBM.
Int — Select internal clock source to take timing from the DBM. This setting is used primarily in point-to-point
applications.
RXC — Select receive clock source to take timing from the remote DBM’s clock source.
Ext — Select external clock source when timing is taken from the external Transmit Timing lead on Port 1
(not
displayed if a TDM/Flex is installed).
Prt1 or — Select the port that timing is to be taken from, using the selected port’s external Transmit
Prt2 Timing lead
(displayed if a TDM/Flex is installed and is enabled).
DSU — Select the DSU’s clock source when connected to a DDS network and the network is to provide the
timing.
Do not select DSU if the DSU and the DBM operate at different rates.
CarrLossDisc: Yes
Next Yes No Prev
Carrier Loss Disconnect
(only displayed when Full Mode is enabled)
.
Controls whether the DBM terminates a call when
receive signal carrier is lost, or when the signal is no longer acceptable.
Yes — Select when you want to terminate the backup call when the carrier is lost.
No — Never select; for factory testing only. Selecting No will cause an off-hook line condition, which will result in
excessive telephone charges.
Auto Retrain:Yes
Next Yes No Prev
Automatic Retrain
(only displayed when Full Mode is enabled)
.
Controls whether the DBM will start a retrain sequence
automatically when received signal quality is no longer acceptable.
Yes — Select if you want the DBM to retrain automatically.
No — Select if you
do
not
want the DBM to retrain automatically. However, the DBM will respond to a retrain
request from a remote modem or DBM.