參數(shù)資料
型號： XRT86VL34IB
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述： DATACOM, FRAMER, PBGA225
封裝： 19 X 19 MM, 1 MM PITCH, PLASTIC, BGA-225
文件頁數(shù)： 22/156頁
文件大?。?/td> 816K
代理商： XRT86VL34IB
XRT86VL34
17
QUAD T1/E1/J1 FRAMER/LIU COMBO - T1 REGISTER DESCRIPTION
REV. V1.2.0
5-4
YEL[1:0]
R/W
00
Yellow Alarm (RAI) Duration and Format
The exact function of these bits depends on whether or not the one-second yellow
alarm rule is enforced. (Bit 7 of this register). The decoding of these bits are
explained in Table 6 and Table 7 below.
T
ABLE
5: A
LARM
G
ENERATION
R
EGISTER
(AGR) H
EX
A
DDRESS
: 0
X
n108
B
IT
F
UNCTION
T
YPE
D
EFAULT
D
ESCRIPTION
-O
PERATION
T
ABLE
6:
YELLOW
ALARM
DURATION
AND
FORMAT
WHEN
ONE
SECOND
RULE
IS
NOT
ENFORCED
YEL[1:0]
Y
ELLOW
A
LARM
D
URATION
AND
F
ORMAT
00
Disable the transmission of yellow alarm
01
SF or N mode:
RAI is transmitted as bit 2 = 0 (second MSB) in all DS0 data chan-
nel.
T1DM mode:
RAI is transmitted as Y-bit = 0 (6th bit in the SYNC byte).
ESF mode:
1.
If YEL[0] bit is set ’high’ for a duration shorter or equal to the
time
required
to
transmit
1111_1111_0000_0000 on the 4-kbit/s data link bits (M1-
M12),
RAI
is
transmitted
1111_1111_0000_0000 (approximately 1 second)
2.
If YEL[0] bit is set ’high’ for a duration longer than the time
required to transmit 255 patterns of 1111_1111_0000_0000
on the 4-kbit/s data link bits (M1-M12), RAI transmission
continues until YEL[0] bit is set ’low’.
3.
If YEL[0] bit forms another pulse during the RAI
transmission, it resets the pattern counter and extends the
RAI
duration
for
another
1111_1111_0000_0000. (approximately 1 second)
255
patterns
of
for
255
patterns.of
255
patterns
of
10
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 YEL[1] bit. This allows continu-
ous RAI of any length.
11
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 (sixteen ones) on the 4kbits/s data link bits
instead of 255 patterns of 1111_1111_0000_0000.
N
OTE
:
255 patterns of 1111_1111_1111_111 is the J1 ESF RAI
standard)
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