參數(shù)資料
型號(hào)： XRT7302
廠商： Exar Corporation
英文描述： 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元)
中文描述： 2頻道E3/DS3/STS-1線路接口單元（2通道E3/DS3/STS-1線接口單元）
文件頁(yè)數(shù)： 33/62頁(yè)
文件大小： 715K
代理商： XRT7302
á
PRELIMINARY
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302
REV. 1.1.6
29
the ENDECDIS(n) bit-field in Command Register
(CR2-(n)), to "1".
If either of these two methods is used to disable the
HDB3/B3ZS Encoder, the LIU transmits the data as
received via the TPData and TNData input pins.
2.4
T
HE
T
RANSMIT
P
ULSE
S
HAPING
C
IRCUITRY
The Transmit Pulse Shaper Circuitry consists of a
Transmit Line Build-Out circuit which can be enabled
or disabled by setting the TxLEV(n) input pin or Tx-
LEV(n) bit-field to "High" or "Low". The purpose of
the Transmit Line Build-Out circuit is to permit config-
uration of each channel in the XRT7302 to transmit
an output pulse which is compliant to either of the fol-
lowing pulse template requirements when measured
at the Digital Cross Connect System. Each of these
Bellcore specifications state that the cable length be-
tween the Transmit Output and the Digital Cross Con-
nect system can range anywhere from 0 to 450 feet.
The Isolated DSX-3 Pulse Template Requirement per
Bellcore GR-499-CORE is illustrated in Figure 12 and
the Isolated STSX-1 Pulse Template Requirement
per Bellcore GR-253-CORE is illustrated in Figure 13.
COMMAND REGISTER CR2-(N)
D4
D3
D2
D1
D0
Reserved
ENDECDIS(n)
ALOSDIS(n)
DLOSDIS(n)
REQEN(n)
X
1
X
X
X
F
IGURE
12. T
HE
B
ELLCORE
GR-499-CORE T
RANSMIT
O
UTPUT
P
ULSE
T
EMPLATE
FOR
DS3 A
PPLICATIONS
DS3 Pulse T emplate
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
-1
-09
-08
-07
-06
-05
-04
-03
-02
-01
0
01
02
03
04
05
06
07
08
09
1
11
12
13
14
Tim e, in UI
N
Lower Curve
Upper Curve
相關(guān)PDF資料
PDF描述
XRT73L02M TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02MIV TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元)
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