參數(shù)資料
型號(hào)： XR-T7295
廠商： Exar Corporation
英文描述： DS3/Sonet STS-1 Integrated Line Receiver
中文描述： DS3/Sonet STS - 1的集成線路接收器
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 226K
代理商： XR-T7295
XR-T7295
9
Rev. 1.05
STS-1 SIGNAL REQUIREMENTS AT THE STSX
For STS-1 operation, the cross-connect is referred at the
STSX-1. Table 5lists the signal requirements at the
STSX-1. Instead of the DS3 isolated pulse template, an
eye diagram mask is specified for STS-1 operation
(TA-TSY-000253). The XR-T7295 correctly decodes any
transmitted signal that meets the mask shown in Figure 6
at the STSX-1.
Parameter
Specification
Line Rate
51.84 Mbps
Line Code
Bipolar with three-0 substitution (B3ZS)
75
5%
A wide-band power level measurement
at the STSX-1 interface using a low-pass
filter with a 3dB cutoff frequency of at
least 200MHz is within -2.7 dBm and 4.7
dBm.
Test Load
Power Levels
Table 5. STSX-1 Interconnection Specification
Figure 6. STSX-1 Isolated Pulse Template for Bellcore TA-TSY-000253
Time Slots - Normalized To Peak Location
1.0
0.8
0.6
0.4
0.2
0-1.0
N
LINE TERMINATION AND INPUT CAPACITANCE
The recommended receive termination is shown in
Figure 3 The 75
resistor terminates the coaxial cable
with its characteristic impedance. The 0.01
μ
F capacitor
to R
IN
couples the signal into the receive input without
disturbing the internally generated DC bias level present
on R
IN
. The input capacitance at the R
IN
pin is 2.8pF
typical (SOJ package) and 3.6pF typical (DIP package).
LOSS LIMITS FROM THE DSX-3 TO THE RECEIVE
INPUT
The signal at the cross-connect may travel through a
distribution frame, coaxial cable, connector, splitters, and
back planes before reaching the XR-T7295 device. This
section defines the maximum distribution frame and cable
loss from the cross-connect to the XR-T7295 input.
The distribution frame jack may introduce 0.6
of loss. This loss may be any combination of flat or
shaped (cable) loss.
The maximum cable distance between the point where
the transmitted signal exits the distribution frame jack and
the XR-T7295 device is 450 ft. (see Figure 2.) The
coaxial cable (Type 728A) used for specifying this
distance limitation has the loss and phase characteristics
shown in Figure 7 and Figure 8 Other cable types also
may be acceptable if distances are scaled to maintain
cable loss equivalent to Type 728A cable loss.
0.55 dB
TIMING RECOVERY
External Loop Filter Capacitor
Figure 3shows the connection to an external 0.1
μ
F
capacitor at the LPF1/LPF2 pins. This capacitor is part of
the PLL filter. A non-polarized, low-leakage capacitor
should be used. A ceramic capacitor with the value 0.1
μ
F
20% is acceptable.
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