Verilink DIU 2130 (880-503297-001) Product Manual - Manual (Page 41)

DIU 2130 Configuration
Verilink 3-17
7. TIU—Used only if the shelf has a TIU 2850 timing circuit
module installed. This is a special circuit card which takes a
T1 signal in on one of several ports, recovers a clock signal
from that input, then propagates that clock signal to all of the
slots in the shelf using bus C. This option should not be
selected unless a TIU 2850 is installed in the shelf.
8. DIU—Used for tail-circuit timing. A single port of a single DIU
2130 may be used to provide clock for that DIU and the CSU if
necessary. Three options must be set for tail-circuit timing.
a. In the DIU 2130, the port to be used to provide timing must
be set to TT clocking.
b. In the DIU 2130, the timing source must equal the port
being used (port 1 or port 2) instead of the usual value of
CSU.
c. DIU may then be selected as the timing source for the CSU.
This option is not recommended except when using mux
mode.