Product Manual - DM991 Series V Family - 204.4092.08
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Figure 19 shows how a digital interface configured as external works when a DM991, with regenerated
clock from the DSL, is connected to an ECD equipment. The traced arrow indicates that the CT115
derives from the DSL interface regenerated clock. The doted arrow indicates that the equipment uses as
transmission clock (CT114) the clock provided by the ECD through the CT113.
Figure 19. Digital Interface Operating with External
9.3.3. CT104 sinc. CT113
In this mode the digital interface works in the same way as in the External mode, but with the CT104 being
generated from the CT113. This mode is recommended to connect a DM991 equipment to a NewBridge®
equipment that operates as ECD. In this case, the system clock is usually the V.35 external clock.
Figure 20 shows how a V.35 configured as CT104 sinc. CT113 works when a DM991 is connected to an
ECD equipment. The scheme is the same as the one shown in the External mode, except that the CT113
received by the DM991 is also used to control the CT104 (as the doted arrow shows). The CT115 does
not alter itself in this way.
Figure 20. Digital Interface Operation with CT104 sinc. CT113
9.3.4. CT113 Unlooped to CT114
In this mode the digital interface works as in the External mode, however the CT113 is not passed to the
CT114. It is recommended when connecting the DM991 to some routers.
Figure 21 shows how a V.35 configured as CT113 Unlooped to CT114 works when a DM991 is connected
to the ECD equipment. The scheme is the same as the one shown in the External mode, except the
CT113 is not passed to the CT114. Therefore the CT114 derives from the system clock. In this case the
modem can not be configured as the digital interface external clock, but it will use the CT113 to sample
the CT103.
Summary of Contents for DM991C
Page 1: ...DM991 SERIES V DM991C DM991CE DM991S DM991SE PRODUCT MANUAL 204 4092 08 rev 08 Date 8 12 2008 ...
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