Verilink DIU 2130 (880-503297-001) Product Manual - Manual (Page 90)

DIU/DIM Details
7-10 Verilink
Figure 7-12 T1 Multiplexer (CSU/DSU) Operation
Drop-and-Insert
Mode
The CSU of an SCC, NCC ,or TAC can also operate with DIUs in a
drop-and-insert mode. This allows the CSU to transmit a
combination of voice (VF) and high-speed data over the T1 network.
The CSU provides drop-and-insert toward either the network or the
equipment in a full-duplex, unidirectional transmission mode.
Toward Network
Figure 7-13 shows a CSU drop-and-insert configuration toward the
network. The incoming signal from the customer’s DS1 equipment
is applied to a multiplexer in the CSU. The multiplexed data from
the DIUs is also routed to this multiplexer over the data bus A on
the shelf backplane. This data occupies the DS0 channel time slots
assigned by the user to the DIUs. The T1 aggregate signal is then
applied by the multiplexer to the network.
DATA
EQPT
DIU
NCC or TAC
DIU DATA BUS A, B, or C on
SYSTEM SHELF BACK PLANE
DATA
EQPT
DATA
EQPT
DATA
EQPT
DIU
XMT DATA
DIU XMT CLOCK
XMT FRAMING
RCV DATA
DIU RCV CLOCK
RCV FRAMING
XMT DATA
DIU XMT CLOCK
XMT FRAMING
RCV DATA
DIU RCV CLOCK
RCV FRAMING
T1
AGGREGATE
AND SIGNAL
PROCESSING
CIRCUITS
TO/FROM
NETWORK