XRT59L91 データシートの表示（PDF） - Exar Corporation

部品番号

コンポーネント説明

メーカー

XRT59L91

Single-Chip E1 Line Interface Unit

Exar Corporation 

XRT59L91

Preliminary

Figure 3, indicates that when the user is operating the

XRT59L91 device in the “Clockless” Mode, then the

Terminal Equipment must do the following.

l Not apply a signal on the “TxClk” line.

l When applying a pulse (to either the TxPOS or

TxNEG 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. Addition,

the RZ pulse should occupy only the first half of

the bit-period. The TxPOS and TxNEG input pins

must be at 0V, during the second half of every 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.

An illustration of the “ITU-T G.703 Pulse Template

Requirements” is presented below in Figure 4.

V = 100%

50%

269ns

(244 + 25)

194ns

Nominal Pulse

10%

0%

10%

244ns

219ns

(244 - 25)

20%

Figure 4. Illustration of the ITU-T G.703 Pulse Template for E1 Application

Rev. P2.00

10

Share Link: