CS61575-IP1 datasheet(11/44 Pages) CIRRUS

11 / 44 page

Transmitter

The transmitter takes digital T1 or E1 input data

and drives appropriately shaped bipolar pulses

onto a transmission line. The transmit data (TPOS

& TNEG or TDATA) is supplied synchronously

and sampled on the falling edge of the input

clock, TCLK.

Either T1 (DSX-1 or Network Interface) or E1

CCITT G.703 pulse shapes may be selected.

Pulse shaping and signal level are controlled by

"line length select" inputs as shown in Table 3.

The CS61575 and CS61574A line drivers are de-

signed to drive a 75

Ω equivalent load.

For E1 applications, the CS61574A and CS61575

drivers provide 14 dB of return loss during the

transmission of both marks and spaces. This im-

proves signal quality by minimizing reflections

off the transmitter. Similar levels of return loss

are provided for T1 applications.

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

655 feet (as measured from the transmitter to the

DSX-1 cross connect) may be selected. The five

partition arrangement in Table 3 meets ANSI

T1.102 and AT&T CB-119 requirements when

using #22 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, two addi-

tional 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

CS61575 and CS61574A automatically adjusts

the pulse width based upon the "line length" se-

lection made.

500

1.0

0.5

-0.5

250

750

1000

TIME (nanoseconds)

OUTPUT

PULSE SHAPE

NORMALIZED

AMPLITUDE

ANSI TI.102,

AT&T CB 119

SPECIFICATIONS

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

MODE

FUNCTION

PIN HARDWARE

EXTENDED

HARDWARE

HOST

TRANSMITTER

3TPOS

TDATA

TPOS

4TNEG

TCODE

TNEG

RECEIVER/DPM

RNEG

BPV

RNEG

7RPOS

RDATA

RPOS

DPM

AIS

DPM

MTIP

RCODE

MTIP

MRING

CONTROL

PCS

LEN0

INT

LEN1

SDI

LEN2

SDO

RLOOP

LLOOP

SCLK

TAOS

CLKE

Table 2. Pin Definitions

LEN2 LEN1 LEN0

Option Selected

Application

0-133 FEET

DSX-1

ABAM

(AT&T 600B

or 600C)

133-266 FEET

266-399 FEET

399-533 FEET

533-655 FEET

000

120

Ω (1:1.26)

Ω (1:1)

CCITT G.703

AT&T CB113

Repeater

FCC PART 68, OPT. A

Network

Interface

011

ANSI T1.403

Table 3. Line Length Selection

CS61574A CS61575

DS154F2

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