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COMSPHERE DualFlow Data Service Units
5-6 December 1996 3615-A2-GB20-20
Table 5-1
DSU Configuration Options
Rate(Kbps):
56
Next 64CC 64L
56 38.4 19.2 9.6 4.8 2.4 Prev
DSU Rate
. Data rate (in kbps) on the digital circuit. Must be set to match the speed of the DDS circuit. Both the control
and tributary DSUs must be set to the same value.
64CC — 64 kbps Clear Channel (on a 72 kbps circuit) with 3600 Series DSUs at both ends of the circuit.
64L — 64 kbps LADS operation.
TxClkSource: DDS
Next Int RXC Ext DDS Prev
Transmit Clock Source
. Specifies the transmit timing source for the DSU.
Int — Internal clock source. Timing is taken from the DSU.
RXC — Receive clock source. The DSU generates its transmit timing from the receive data signal. This choice is
provided for LADS configurations. It differs from the DDS selection during tests.
Ext — External clock source. The DSU is timed by the external Transmit T
iming lead.
DDS — DDS Network. This source is used when the DSU is connected to a DDS network and the network
provides the timing.
19.2 PowrLvl: +6
Next +
6 0 –10 Prev
19.2 kbps Power Level
. Selects the appropriate power level, in dBm, for operation at 19.2 kbps. This configuration option
only appears when
Rate(Kbps)
is set to 19.2.
+6 — For DDS network service.
0
— For alternate DDS service.
–10 — For LADS operation.
64KScramblng: Off
Next On Off Prev
64 kbps Scrambling
. Controls the data scrambler used with 64 kbps Clear Channel operation. Data scrambling
suppresses the possible simulation of network control codes by application data. This configuration option must be the
same at both the local and remote DSUs. This configuration option only appears when
Rate(Kbps)
is set to 64CC.
On — Enables data scrambling.
Off — Disables data scrambling.
64KLatchLpbk: On
Next On Off Prev
64 kbps Latching Loopback
. Controls the DSU’s response to the network latching loopback sequence on 64 kbps Clear
Channel operation. This configuration option only appears when Rate(Kbps) is set to 64CC.
On — DSU responds to the network latching loopback command. ON is required for compliance with AT&T
Technical Reference 62310 – 1987.
Off — DSU ignores the network latching loopback command.
V.54 Lpbk: Disab
Next Enab Disab Prev
V.54 Loopback
. Enables CCITT V.54 Loopback operation. This configuration option is supported for point-to-point
configurations.
Enab — This configuration option should be enabled if the remote DTE generates V.54 loopback sequences or if
the DualFlow DSU is communicating with a non-AT&T DSU that supports V.54 signaling.
Disab — This configuration option should not be enabled if the remote DTE does not support V.54 loopback
sequences or other DSUs do not support V
.54 signaling.