DS2282 datasheet(2/22 Pages) DALLAS

2 / 22 page

DS2282

022798 2/22

OVERVIEW

The DS2282 completely controls the Facility Data Link

(FDL) in T1 environments. It can handle the FDL re-

quirements outlined in American National Standards

Institute (ANSI) document T1.403–1989 or those out-

lined in the AT&T publication TR 54016 (1986/89). Re-

covered data from a T1 line is clocked into the DS2282

via the RPOS and RNEG pins with the RCLK signal.

See Figure 1. The DS2282 synchronizes to the incom-

ing data stream and extracts the FDL. Then, it will de-

code the incoming messages on the FDL and properly

create the FDL messages that must be transmitted.

An asynchronous serial port is used to control the

DS2282 and to retrieve data from it. The port is oper-

ated at 19.2 Kbps. Access to the onboard registers is

achieved through the serial port via the TXD and RXD

pins. An address can be assigned to this serial port.

This allows a single external controller to communicate

over a single bus to as many as 31 separate DS2282’s.

See Figure 2. Each DS2282 will listen for its address

and only respond when it is asked to do so.

Most of the clearable registers in the DS2282 that either

count error events or errored time intervals are recorded

in onboard, nonvolatile memory. Hence, in case of a lo-

cal loss of power, these registers will maintain their

counts.

Two typical applications of the DS2282 are shown in

Figures 3A and 3B. In these applications, the DS2282 is

completely controlling the FDL as well as monitoring the

T1 line. The DS2250 Micro Stik is used to configure the

DS2282 and to extract any performance data that may

be required. In these applications, the DS2250 is also

used to control either the DS2283 Enhanced T1 Line

Card Stik or the DS2180A T1 Transceiver. The DS2282

can also be operated without an external controller. See

Hardware Mode section and Table 7.

DS2282 BLOCK DIAGRAM Figure 1

INT(7)

SLIP(13)

FDL

EXTRACTOR

PERFORMANCE REPORT MESSAGE

UNSCHEDULED MESSAGE

MAINTENANCE MESSAGE DECODER

SYNCHRONIZER

ERROR

DETECTOR

PERFORMANCE REPORT MESSAGE

UNSCHEDULED MESSAGE

MAINTENANCE MESSAGE DECODER

NONVOLATILE

MEMORY

UBR

SERIAL PORT

CONTROLLER

RESET

VDD(1)

GND(23)

TXD(11)

RXD(10)

DRVEN(9)

UB1(16)

UB2(17)

UB3(18)

UB4(19)

UB5(24)

UB6(25)

RCLK(3)

RPOS(4)

RNEG(5)

TLCLK(12)

TLINK(28)

PRMXA(8)

RST(21)

PSEN(27)

PAS(15)

RLOS(2)

B8ZS(20)

LLB(26)

PLB(14)

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