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051700

FEATURES

Generates/Detects digital bit patterns for

analyzing, evaluating and troubleshooting

digital communications systems

Operates at speeds from DC to 52 MHz

Programmable polynomial length and

feedback taps for generation of any other

pseudorandom pattern up to 32 bits in length

including: 2

and 2

Programmable user-defined pattern and

length for generation of any repetitive pattern

up to 32 bits in length

Large 32-bit error count and bit count

registers

Software programmable bit error insertion

Fully independent transmit and receive

sections

8-bit parallel control port

Detects test patterns with bit error rates up to

10

-2

PIN ASSIGNMENT

ORDERING INFORMATION

DS2172T

(0

DS2172TN

(-40

DESCRIPTION

The DS2172 Bit Error Rate Tester (BERT) is a software programmable test pattern generator, receiver,

and analyzer capable of meeting the most stringent error performance requirements of digital

transmission facilities.

Two categories of test pattern generation (Pseudo-random and Repetitive)

conform to CCITT/ITU O.151, O.152, O.153, and O.161 standards. The DS2172 operates at clock rates

ranging from DC to 52 MHz. This wide range of operating frequency allows the DS2172 to be used in

existing and future test equipment, transmission facilities, switching equipment, multiplexers, DACs,

Routers, Bridges, CSUs, DSUs, and CPE equipment.

The DS2172 user-programmable pattern registers provide the unique ability to generate loopback patterns

required for T1, Fractional-T1, Smart Jack, and other test procedures. Hence the DS2172 can initiate the

loopback, run the test, check for errors, and finally deactivate the loopback.

The DS2172 consists of four functional blocks: the pattern generator, pattern detector, error counter, and

control interface. The DS2172 can be programmed to generate any pseudorandom pattern with length up

to 2

inputs can be used to configure the DS2172 for applications requiring gap clocking such as Fractional-T1,

Switched-56, DDS, normal framing requirements, and per-channel test procedures. In addition, the

DS2172 can insert single or 10

DS2172

Bit Error Rate Tester (BERT)

www.dalsemi.com

TL

AD0

AD1

TEST

VSS

AD2

AD3

AD4

24

23

22

21

20

19

18

17

1

2

3

4

5

6

7

8

RL

RLOS

LC

VSS

VDD

INT

WR(R/W)

ALE(AS)

DS2172

32-Pin TQFP

9 10 11 12 13 14 15 16

32 31 30 29 28 27 26 25