CN8380 Datasheet, PDF (35/91 Pages) Conexant Systems, Inc – integrated quad line interface unit unit for both 1.544 Mbps (T1) and 2.048 Mbps (E1) applications

CN8380
Quad T1/E1 Line Interface
2.0 Circuit Description
2.4 Transmitter
2.4.5 Pulse Shaper
All transmit pulse shaping to meet E1 and T1 transmission standards is done
internally, eliminating the need for external shaping circuitry. The pulse shape
block receives bipolar NRZ transmit data, produces a set of eight 5-bit values
which define the pulse shape, and converts the shape values into an analog pulse
using a DAC. Table 2-3 lists the transmit pulse template selections and
applications.
Table 2-3. Transmit Pulse Configurations
Application
Line Rate
T1
DSX-1
T1.102
T1
CB119
T1
100 Ω Twisted Pair
T1
T1
ITU–T G.703
E1
75 Ω Coaxial Cable
ITU–T G.703
E1
120 Ω Twisted Pair
FCC Part 68 Opt A
T1
I.431
100 Ω Twisted Pair
Line Length
0–133 ft.
133–266 ft.
266–399 ft.
399–533 ft.
533–655 ft.
—
—
—
Hardware Mode
Configuration
PTS(2:0)
000
001
010
011
100
101
110
111
Host Mode Configuration
[TLIU_CR; addr n2]
PULSE(2:0)
000
001
010
011
100
101
110
111
In Hardware Mode, standard pulse templates are selected globally for all
channels using hardware pins PTS(2:0). Refer to the Chapter 1.0, Pin
Descriptions, and Table 1-1, Hardware Signal Definitions.
N8380DSA
Conexant
2-13
Advance Information