REV. 1.2.1 TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT Figure 5, indicates that when the user is operating a channel in the Clockles" />
參數(shù)資料
型號： XRT59L921IB
廠商： Exar Corporation
文件頁數(shù)： 11/32頁
文件大?。?/td> 0K
描述： IC LIU E1 21CH 316STBGA
標(biāo)準(zhǔn)包裝： 60
類型： 線路接口裝置（LIU）
驅(qū)動(dòng)器/接收器數(shù)： 21/21
規(guī)程： E1
電源電壓： 3.13 V ~ 3.46 V
安裝類型： 表面貼裝
封裝/外殼： 316-LBGA
供應(yīng)商設(shè)備封裝： 316-STBGA（21x21）
包裝： 托盤
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.
FIGURE 5. ILLUSTRATION ON HOW THE TERMINAL EQUIPMENT SHOULD APPLY DATA TO THE TRANSMIT SECTION OF A
GIVEN
CHANNEL (WITHIN THE XRT59L921), WHEN OPERATING IN THE CLOCKLESS MODE
TxPOS_n
TxNEG_n
TClk_n
11
1
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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