XRT83SL216 datasheet(23/41 Pages) EXAR

23 / 41 page

PRELIMINARY

XRT83SL216

REV. P1.0.3

16-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT

2.4

TAOS (Transmit All Ones)

The XRT83SL216 has the ability to transmit all ones on a per channel basis by programming the appropriate

channel register. If TAOS is enabled, the Transmitter outputs will generate an All Ones pattern regardless of

the Transmit Input data. The Remote Loop Back mode has priority over TAOS. Figure 13 is a diagram showing

the all ones signal at TTIP and TRING.

2.5

ATAOS (Automatic Transmit All Ones)

ATAOS is used to generate an All Ones signal only when an RLOS condition occurs. If ATAOS is enabled, any

channel that experiences an RLOS condition will automatically cause the transmitter on that channel to send

an All Ones Pattern to the line using MCLK as reference. When RLOS clears, the All Ones pattern ends and

the Transmit path returns to normal operation.

FIGURE 13. TAOS (TRANSMIT ALL ONES)

FIGURE 14. SIMPLIFIED BLOCK DIAGRAM OF THE ATAOS FUNCTION

TAOS

All "1's"

Generator

TTIP

ATAOS

RLOS

TRING

Timing derived

from MCLK

XRT83SL216 Datasheet(PDF) 23 Page - Exar Corporation