XRT83SH314 Просмотр технического описания (PDF) - Exar Corporation

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XRT83SH314

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

Exar Corporation 

REV. 1.0.4

XRT83SH314

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

TABLE 4: TIMING SPECIFICATIONS FOR RCLK/RPOS/RNEG

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

RCLK Duty Cycle

RCDU

45

50

55

%

Receive Data Setup Time

RSU

150

-

-

ns

Receive Data Hold Time

RHO

150

-

-

ns

RCLK to Data Delay

RDY

-

-

40

ns

RCLK Rise Time (10% to 90%)

RCLKR

-

with 25pF Loading

-

40

ns

RCLK Fall Time (90% to 10%)

RCLKF

-

with 25pF Loading

-

40

ns

NOTE: VDD=3.3V ±5%, TA=25°C, Unless Otherwise Specified

2.2.1 Receive Sensitivity

To meet short haul requirements, the XRT83SH314 can accept T1/E1/J1 signals that have been attenuated by

12dB of flat loss in E1 mode or by 655 feet of cable loss along with 6dB of flat loss in T1 mode. However, the

XRT83SH314 can tolerate cable loss and flat loss beyond the industry specifications. The receive sensitivity in

the short haul mode is approximately 4,000 feet without experiencing bit errors, LOF, pattern synchronization,

etc. Although data integrity is maintained, the RLOS function (if enabled) will report an RLOS condition

according to the receiver loss of signal section in this datasheet. The test configuration for measuring the

receive sensitivity is shown in Figure 8.

FIGURE 8. TEST CONFIGURATION FOR MEASURING RECEIVE SENSITIVITY

W&G ANT20

Network

Analyzer

Tx

Cable Loss

Rx

Rx

Flat Loss

XRT83SH314

External Loopback

14-Channel

Tx

Long Haul LIU

E1 = PRBS 215 - 1

T1 = PRBS 223 - 1

19

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