參數(shù)資料
型號(hào)： XRT59L921
廠商： Exar Corporation
英文描述： TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
中文描述： 二十一條路E1線路接口單元
文件頁(yè)數(shù)： 19/32頁(yè)
文件大?。?/td> 377K
代理商： XRT59L921
XRT59L921
17
REV. 1.2.1
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
Figure 5
, indicates that when the user is operating a channel in the Clockless Mode, then the corresponding
Terminal Equipment must do the following:
Not apply a signal on the TxClk_n line and connect TxClk to "High"
When applying a pulse (to either the TxPOS_n or TxNEG_n input pin), apply an RZ pulse to the appropriate
input pin. This RZ pulse should only have a width of one-half the bit-period.
1.3
The Pulse Shaping Circuit
The purpose of the Transmit Pulse Shaping circuit is to generate Transmit Output pulses that comply with the
ITU-T G.703 Pulse Template Requirements for E1 Applications.
F
IGURE
5. I
LLUSTRATION
ON
HOW
THE
T
ERMINAL
E
QUIPMENT
SHOULD
APPLY
DATA
TO
THE
T
RANSMIT
S
ECTION
OF
A
GIVEN
C
HANNEL
(
WITHIN
THE
XRT59L921),
WHEN
OPERATING
IN
THE
C
LOCKLESS
M
ODE
TxPOS_n
TxNEG_n
TClk_n
1
1
1
1
1
0
0
DATA
Bit
Period
RZ Pulse is to be
applied in the first
half of the bit-period
No Pulse is to be
applied in the 2nd
half of the bit-period
No Activity in TxClk Line, TxClk_n="High"
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