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CS61305A Datasheet(PDF) 10 Page - Cirrus Logic

Part No. CS61305A
Description  T1/E1 LINE INTERFACE
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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Transmitter
The transmitter takes digital T1 or E1 input data
and drives appropriately shaped bipolar pulses
onto a transmission line. The transmit data (TPOS
& TNEG or TDATA) is supplied synchronously
and sampled on the falling edge of the input
clock, TCLK.
Either T1 (DSX-1 or Network Interface) or E1
CCITT G.703 pulse shapes may be selected.
Pulse shaping and signal level are controlled by
"line length select" inputs as shown in Table 3.
The output options in Table 3 are specified with a
1:1.15 transmitter transformer turns ratio for T1
and a 1:1 turns ratio for E1 without external se-
ries resistors. Other turns ratios may be used if
approriate resistors are placed in series with the
TTIP and TRING pins. Table A1 in the applica-
tions section lists other combinations which can
be used to provide transmitter impedance match-
ing.
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 3 meets ANSI
T1.102-1993 and AT&T CB-119 requirements
when using #22 ABAM cable. A typical output
pulse is shown in Figure 8. These pulse settings
can also be used to meet CCITT pulse shape re-
quirements for 1.544 MHz operation.
For T1 Network Interface applications, two addi-
tional options are provided. Note that the optimal
pulse width for Part 68 (324 ns) is narrower than
the optimal pulse width for DSX-1 (350 ns). The
CS61305A automatically adjusts the pulse width
based upon the "line length" selection made.
The E1 G.703 pulse shape is supported with line
length selections LEN2/1/0 = 0/0/0 and 0/0/1.
The pulse width will meet the G.703 pulse shape
template shown in Figure 9, and specified in Ta-
ble 4.
The CS61305A transmitter provides short-circuit
current limiting protection and meets OFTEL
OTR-001 short-circuit current limiting require-
ments for E1 applications.
The CS61305A will detect a static TCLK, and
will force TTIP and TRING low to prevent trans-
mission when data is not present. When any
transmit control pin (TAOS, LEN0-2 or LLOOP)
is toggled, the transmitter outputs will require ap-
proximately 22 bit periods to stabilize. The
transmitter will take longer to stabilize when
RLOOP is selected because the timing circuitry
must adjust to the new frequency.
500
1.0
0.5
0
-0.5
0
250
750
1000
NORMALIZED
AMPLITUDE
AT&T CB 119
SPECIFICATIONS
PULSE SHAPE
OUTPUT
TIME (nanoseconds)
ANSI T1.102,
Figure 8. Typical Pulse Shape at DSX-1 Cross Connect
LEN2 LEN1 LEN0
Option Selected
Application
01
1
0-133 ft
DSX-1
ABAM
(AT&T 600B
or 600C)
10
0
133-266 ft
10
1
266-399 ft
11
0
399-533 ft
11
1
533-655 ft
00
0
75
Ω coax
E1
CCITT G.703
00
1
120
Ω twisted-pair
0
1
0
FCC PART 68, OPT. A
Network
Interface
0
1
1
ANSI T1.403
Table 3. Line Length Selection
CS61305A
10
DS157PP3




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