Verilink DIU 2130 (880-503297-001) Product Manual - Manual (Page 94)

DIU/DIM Details
7-14 Verilink
In network timing, DS1 data is timed through the CSU by a
reference clock derived from the incoming signal from the
network. The network-extracted transmit clocks also synchronize
the DIUs to the CSU. These clocks are applied to the DIUs via the
assigned data bus.
Figure 7-15 Network Timing (T1 Multiplexer Mode)
Figure 7-16 Network Timing (Drop and Insert Mode)
External Timing In external timing, the network and equipment signals are timed
through the CSU of an NCC or TAC by a customer-furnished
reference clock. External timing can be provided directly to the CSU
as described below. In all external timing modes, the receive DIU
clock is always derived from the T1 signal to the CSU.
TO/FROM
NETWORK
CLOCK
NCC or TAC
DATA BUS A, B, or C
TO/FROM OTHER DIUs
DIU
DATA
EQPT
XMT DAT
RCV DATA
XMT CLOCK
RCV CLOCK
DS-1 EQPT
FIFO
FIFO
CLOCK
DATA EQPT
DIU
TO/FROM OTHER DIUs
M
U
X
M
U
X
ALL
ONEs
XMT Data
RCV Data
XMT Clock
RCV Clock
DATA BUS A
NCC or TAC