XRT86VL32 datasheet(22/174 Pages) EXAR

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XRT86VL32

DUAL T1/E1/J1 FRAMER/LIU COMBO - E1 REGISTER DESCRIPTION

REV. V1.2.0

TABLE 5: ALARM GENERATION REGISTER (AGR)

HEX ADDRESS: 0Xn108

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

Transmit AUXP

Pattern

R/W

Transmit Auxiliary (AUXP) Pattern

This bit permits the user to command the Transmit E1 Framer block to

transmit the AUXP Pattern to the remote terminal equipment, as depicted

below.

0 - Configures the Transmit E1 Framer block to NOT transmit the AUXP

Pattern (which is an unframed, repeating 1010... pattern).

1 - Configures the Transmit E1 Framer block to transmit the AUXP Pattern.

The device also supports AUXP pattern detection, please read register

(address 0xnB0A) for more detail.

Loss of Frame

Declaration Crite-

ria

R/W

Loss of Frame Declaration Criteria

This bit permits the user to select the “Loss of Frame Declaration Criteria”

for the Receive E1 Framer block, as depicted below.

0 = Loss of Frame is declared immediately if either CRC Multiframe Align-

ment or FAS Alignment is lost.

1 = Loss of Frame is declared immediately if FAS Alignment is lost. If CRC

Multiframe Alignment is lost for more than 8ms, E1 receive framer will

force a frame search.

5-4

Transmit YEL And

Multi-YEL[1:0]

R/W

Yellow Alarm and Multiframe Yellow Alarm Generation [1:0]

These bits activate or deactivate the transmission of yellow and multiframe

yellow alarm. The Yellow alarm and multiframe Yellow alarm can be forced

to transmit as’1’, or be inserted upon detection of loss of alignment. The

decoding of these bits are explained as follows:

YEL[1:0]

YELLOW ALARM TRANSMITTED

00/10

Yellow Alarm and Multiframe Yellow Alarm transmission

is disabled.

Automatic Transmission of Yellow and CAS Multiframe

Yellow Alarms are enabled, as described below:

1. Whenever the Receive E1 Framer block declares the

LOF (Loss of FAS Framing) defect condition:

The corresponding Transmit E1 Framer block will automati-

cally transmit the Yellow Alarm indicator (by setting Bit 3 of

Time-Slot 0, within the non-FAS frames) to 1" whenever

(and for the duration that) the Receive E1 Framer block

declares the LOF defect condition.

2. Whenever the Receive E1 Framer block declares the

“Loss of CAS Multiframe Alignment” defect condition:

The corresponding Transmit E1 Framer block will automati-

cally transmit the CAS Multiframe Yellow Alarm indicator (by

setting Bit 6 within “Frame 0" of Time-slot 16) to “1” when-

ever (and for the duration that) the Receive E1 Framer block

declares the Loss of CAS Multiframe Defect condition.

Force Transmission of Yellow and Multiframe Yellow

Alarm

Both Yellow and Multiframe Yellow Alarm are transmitted as

‘1’ when this is enabled.

XRT86VL32 Datasheet(PDF) 22 Page - Exar Corporation

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