XRT7295ATIWTR Exar Corporation, XRT7295ATIWTR Datasheet - Page 7

• Manufacturer Part Number: XRT7295ATIWTR
• Description: DS3/SONET STS-1 Line Receiver
• Manufacturer: Exar Corporation

Specifications of XRT7295ATIWTR

• Lead Free Status / RoHS Status: Contains lead / RoHS Compliant

DS3 SIGNAL REQUIREMENTS AT THE DSX
Pulse characteristics are specified at the DSX-3, which is
an interconnection and test point referred to as the
cross-connect (see Figure 2.) The cross-connect exists
at the point where the transmitted signal reaches the
distribution frame jack.
requirements. Currently, two isolated pulse template
Notes
1
2
3
The pulse template proposed by G.703 standards is shown in Figure 5 and specified in Table 3. The proposed G.703 standards
further state that the voltage in a time slot containing a 0 must not exceed ± 5% of the peak pulse amplitude, except for the residue
of preceding pulses.
The power levels specified by the proposed G.703 standards are identical except that the power is to be measured in 3kHz bands.
The all 1s pattern must be a pure all 1s signal, without framing or other control bits.
Rev.1.20
Power Levels
Pulse Shape
-0.36 ± T ± +0.28
Parameter
Line Code
Line Rate
Test Load
T ± -0.36
0.28 ± T
Table 2. DSX-3 Pulse Template Boundaries for ACCUNET T45 Standards (See Figure 4.)
Time
Specification
44.736 Mbps ¦20 ppm
Bipolar with three-0 substitution (B3ZS)
75 W ¦5%
An isolated pulse must fit the template in NO TAG or Figure 5.
a constant factor to fit the template. The pulse amplitude must be between 0.36vpk and 0.85vpk,
measured at the center of the pulse.
For and all 1s transmitted pattern, the power at 22.368 ± 0.002MHz must be -1.8 to +5.7dBm, and
the power at 44.736 ±0.002MHz must be -21.8dBm to -14.3dBm.
Lower Curve
Table 1 lists
0.5 (1+sin {p/2}[1+T/0.18])
Table 1. DSX-3 Interconnection Specification
0.11e
Equation
-3.42(T-0.3)
0
the signal
7
requirements exist: the ACCUNET T45 pulse template
(see Table 2 and Figure 4)and the G.703 pulse template
(see Table 3 and Figure 5). Table 2 and Table 3 give the
associated boundary equations for the templates. The
XRT7295AT correctly decodes any transmitted signal
that meets one of these templates at the cross-connect.
-0.68 ± T± +0.36
0.36 ± T
T±-0.68
Time
1
The pulse amplitude may be scaled by
Upper Curve
2, 3
XRT7295AT
0.5 (1+sin {p/2} [1+T/0.34])
0.05 + 0.407e
Equation
0
-1.84(T-0.36)