Verilink DIU 2130 (880-503297-001) Product Manual - Manual (Page 14)

DIU 2130 Overview
1-4 Verilink
Figure 1-7 Typical DIU 2130 Configurations
For a typical CSU/DSU configuration with multiple DIUs, up to 12
DIU 2130s can be connected to an NCC, SCC, or TAC to
accommodate up to 24 data ports (Section B of
Figure 1-7 ). In this
example, each port operates at 56 kbit/s and requires one DS0
channel on the T1 network.
Drop-and-Insert
Mode
The DIU 2130 can also be used with an NCC, SCC, or TAC in drop-
and-insert mode. This mode permits a combination of analog (VF)
and high-speed data to be transmitted over a single T1 circuit on
the network. Drop and insert is transparent to the DIU hardware
and depends on the configuration of the CSU. Drop and insert can
be provided toward either the DS1 equipment or the network.
DIU Data Buses Three separate data buses (A, B, and C) convey data between the
DIUs and the associated NCCs, SCCs, or TACs. These buses are
located on the system shelf backplane, and can be extended from
shelf to shelf through data-bus extension cables. In T1 multiplexer
(CSU/DSU) mode, one data bus is assigned to each CSU-DIU array. In
drop-and-insert, data bus “A” is typically assigned to each DIU-CSU
array. A second bus is also needed if the DIUs and CSU are timed
from an external clock source, or if they are timed from the data
equipment connected to a DIU data port.
DATA BUS A, B OR C ON
SHELF BACKPLANE
TO/FROM
NETWORK
DIU (1)
XMT DATA
DIU XMT CLOCK
XMT FRAMING
RCV DATA
DIU RCV CLOCK
RCV FRAMING
DIU (12)
NCC 2020,
OR
TAC 2010
TO/FROM
NETWORK
DIU (1)
XMT DATA
DIU XMT CLOCK
XMT FRAMING
RCV DATA
DIU RCV CLOCK
RCV FRAMING
672 Kbit/s
672 Kbit/s
56 Kbit/s
56 Kbit/s
56 Kbit/s
56 Kbit/s
DATA
EQ 2
DATA
EQ 1
DATA
EQ 2
DATA
EQ 1
DATA
EQ 2
DATA
EQ 1
XMT DATA
DIU XMT CLOCK
XMT FRAMING
RCV DATA
DIU RCV CLOCK
RCV FRAMING
A. SINGLE DIU 2130
B. MULTIPLE DIUs
SCC 2020,
NCC 2020,
OR
TAC 2010
SCC 2020,