CS61535A datasheet(12/48 Pages) CIRRUS

12 / 48 page

CS61535A line driver is designed to drive a 75

Ω

equivalent load.

For T1 DSX-1 applications, line lengths from 0 to

655 feet (as measured from the transmitter to the

DSX-1 cross connect) are selectable. The five

partition arrangement meets ANSI T1.102-1993

requirements when using ABAM cable. A typical

output pulse is shown in Figure 8. These pulse

settings can also be used to meet CCITT pulse

shape requirements for 1.544 MHz operation.

For T1 Network Interface applications, additional

options are provided. Note that the optimal pulse

width for Part 68 (324 ns) is narrower than the

optimal pulse width for DSX-1 (350 ns). The

CS61535A automatically adjusts the pulse width

based upon the "line length " selection made.

The E1 G.703 pulse shape is supported with line

length selection LEN2/1/0=0/0/0. The pulse

width will meet the G.703 pulse shape template

shown in Figure 9, and specified in Table 4.

For E1 applications, the CS61535A driver pro-

vides 14 dB of return loss during the transmission

of both marks and spaces. This improves signal

quality by minimizing reflections off the trans-

mitter. Similar levels of return loss are provided

for T1 applications.

The CS61535A transmitter will detect a failed

TCLK, and will force the TTIP and TRING out-

puts low.

500

1.0

0.5

-0.5

250

750

1000

NORMALIZED

AMPLITUDE

AT&T CB 119

SPECIFICATION

CS61535A

PULSE SHAPE

OUTPUT

TIME (nanoseconds)

Figure 8. Typical Pulse Shape at DSX-1 Cross Connect

LEN2

LEN1

LEN0

OPTION SELECTED

APPLICATION

0-133 FEET

DSX-1

ABAM

(AT&T 600B

or 600C)

100

133-266 FEET

101

266-399 FEET

110

399-533 FEET

111

533-655 FEET

001

AT&T CB113

(CS61535A only)

REPEATER

CCITT G.703

2.048 MHz E1

FCC Part 68, Option A

CSU NETWORK

INTERFACE

ANSI T1.403

Table 3. Line Length Selection

For c o axial cab le ,

Ω

l oad

and

transformer specified

in Application Section.

For shielded twisted

pair, 120

Ω load and

transformer specified

in Application Section.

Nominal peak voltage of a mark (pulse)

2.37 V

3 V

Peak voltage of a space (no pulse)

±0.237 V

±0.30 V

Nominal pulse width

244 ns

Ratio of the amplitudes of positive and negative

pulses at the center of the pulse interval

0.95 to 1.05*

Ratio of the widths of positive and negative

pulses at the nominal half amplitude

0.95 to 1.05*

* When configured with a 0.47

µF nonpolarized capacitor in series with the TX transformer

primary as shown in Figures A1, A2 and A3.

Table 4. CCITT G.703 Specifications

CS61535A

DS40F2

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