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CS61581 Datasheet(PDF) 11 Page - Cirrus Logic

Part No. CS61581
Description  T1/E1 Universal Line Interface
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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CS61581
DS211PP8
11
loading from external components such as high
voltage protection devices.
For T1 DSX-1 applications, line lengths from 0 to
655 feet (as measured from the transmitter to the
DSX-1 cross connect) may be selected. The five
partition arrangement in Table 1 meets ANSI
T1.102 pulse shape requirements when using #22
ABAM or AT&T 600 series cable. A typical output
pulse is shown in Figure 6. These pulse settings can
also be used to meet ITU-T pulse shape require-
ments for 1.544 MHz operation. Short haul pulse
shapes for T1 and E1 are selected by the LEN[2:0]
bits in Control Register 1.
Note that when the device is operated at E1 fre-
quency in the hardware mode, it defaults to low im-
pedance, long haul mode. The pulses driven by the
transmitter in this mode are T1.403 (350ns) pulses
with an overshoot and an undershoot. To drive
pulses without overshoot and undershoot in E1
long haul mode, the E1_LH bit (CR3.6) must be set
to 1, with the SH/LH bit (CR2.0) set to 0.
The E1 G.703 pulse shape is supported with line
length selections LEN[2:0] = 000 for 2.37 V 75
.
applications or LEN[2:0] = 001 for 3.0 V 120
. ap-
plications. The output pulse will meet the G.703
pulse shape template shown in Figure 7. The output
impedance of the driver will adjust according to the
pulse shape selected.
In the short haul mode, setting the LEN[2:0] bits
also controls the transmitter output impedance. For
long haul operation, driver impedance is deter-
mined by the desired selection of MATCHZ and
E1_LH bits. When MATCHZ is set to β€œ0” the out-
put impedance is low, and the impedance presented
to the line is controlled by external resistors. When
MATCHZ is set to 1, E1_LH determines whether
* MATCHZ = CR2.5
Long Haul
LB02
LB01
Output Pulse
0
0
0 dB
0
1
-7.5 dB
1
0
-15 dB
1
1
-22.5 dB
Transformer Turns
Ratio
Mode
Transmit Receive
HDW or MATCHZ* = 0
1:2
1:1
MATCHZ* = 1
1:1.5
1:1
Short Haul
LEN2
LEN1
LEN0
Output Pulse
Line Z
0
0
0
E1
2.37 V
75
.
0
0
1
E1
3.0 V
120
.
011
DSX-1
0’-133’
100
.
100
DSX-1
133’-266’
100
.
101
DSX-1
266’-399’
100
.
110
DSX-1
399’-533’
100
.
111
DSX-1
533’-655’
100
.
0
1
1
ANSI
T1.403
100
.
010
FCC Part 68,
Option A
6.0 V
100
.
Table 1. Pulse Shape Selection and Transformer Requirements
CS61581
DS211F1
11




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