Verilink DIU 2130 (880-503297-001) Product Manual - Manual (Page 91)

DIU/DIM Details
Verilink 7-11
Figure 7-13 Drop-and-Insert Toward Network
In the opposite direction of transmission, the CSU passes the
incoming T1 signal to the DIUs over data bus A. The equipment-
side multiplexer of the CSU also routes the incoming network
signal to the DS1 equipment. In addition, it inserts all-ones idle
code bytes into the DS0 channel time slots assigned to the DIUs,
and sends this data to the DS1 equipment.
Figure 7-14 shows how DS0 data is processed during drop-and-
insert toward the network. In this example, channels 1 to 18 of the
signal from the DS1 equipment convey voice channels from the
channel bank or PBX.
NCC or TAC
CLK
M
U
X
M
U
X
CLK
DATA BUS A
TO/FROM
NETWORK
ALL
ONES
XMT
RCV
TO/FROM OTHER DIUs
DIU
DATA
EQPT
DS- 1
EQUIPMENT
RCV
XMT
XMT DATA
RCV DATA
XMT CLOCK
RCV CLOCK