XRT86VL34 datasheet(23/156 Pages) EXAR

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XRT86VL34

REV. V1.2.0

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

5-4

YEL[1:0]

R/W

(Continued)

TABLE 5: ALARM GENERATION REGISTER (AGR)

HEX ADDRESS: 0Xn108

BIT

FUNCTION

TYPE DEFAULT

DESCRIPTION-OPERATION

TABLE 7: YELLOW ALARM FORMAT WHEN ONE SECOND RULE IS ENFORCED

YEL[1:0]

YELLOW ALARM FORMAT

Disable the transmission of yellow alarm

SF or N mode:

RAI is transmitted as bit 2 = 0 (second MSB) in all DS0 data channel.

T1DM mode:

RAI is transmitted as Y-bit = 0 (6th bit in the SYNC byte).

ESF mode:

YEL[1:0] controls the format of RAI. When YEL[1:0] is set to’01’, RAI

is transmitted as 255 patterns of 1111_1111_0000_0000 on the 4-

kbit/s data link (M1-M12) (approximately 1 second).

ALARM_ENB (Bit 6 of this register) controls the duration of RAI as

described below:

1. If ALARM_ENB bit is set ’high’ for a duration shorter or equal

the

time

required

transmit

255

pattern

1111_1111_0000_0000 on the 4-kbit/s data link (M1-M12), RAI

is transmitted for 255 patterns. (approximately 1 second)

2. If ALARM_ENB bit is set ’high’ for a duration longer than the

time

required

transmit

255

patterns

1111_1111_0000_0000 on the 4-kbit/s data link (M1-M12), RAI

continues until ALARM_ENB bit is set ’low’.

3. If ALARM_ENB forms another pulse during an alarm

transmission, it resets the pattern counter and extends the

RAI duration for another 255 patterns.(approximately 1

second)

NOTE: A minimum of one second delay between termination of the

first RAI and the initiation of a subsequent RAI is enforced.

SF mode:

RAI is transmitted as a “1” in the Fs bit of frame 12 (This is RAI for J1

SF standard).

T1DM mode:

RAI is transmitted as Y-bit = 0 (6th bit in the SYNC byte).

ESF mode:

RAI is controlled by the duration of ALARM_ENB bit. This allows

continuous RAI of any length.

SF, N, and T1DM mode:

RAI format is the same as described above when YEL[1:0] is set

to’01’.

ESF mode:

RAI duration is the same as described above when YEL[1:0] is set

to’01’, except that format of RAI is transmitted as 255 patterns of

1111_1111_1111_1111 on the 4kbits/s data link bits (J1 ESF stan-

dard) instead of 255 patterns of 1111_1111_0000_0000.

XRT86VL34 Datasheet(PDF) 23 Page - Exar Corporation

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