BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 173

• Manufacturer Part Number: BT8375
• Description: single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
RYEL
RAIS
RALOS
RLOS
N8370DSE
Receive Yellow Alarm—Real-time or integrated RYEL status depends on both the selected
receive framer and Yellow Alarm integration modes [YEL_INTEG; addr 045]. Refer to
Table 3-12, Receive Yellow Alarm
Set/Clear Criteria
Receive Alarm Indication Signal—Criteria for detection and clearance of RAIS, per ITU
G.775 and ANSI T1.231.
Receive Analog Loss of Signal or RCKI Loss of Clock—Real-time RALOS status depends on
the selection of receive bipolar or digital inputs [RDIGI; addr 020].
Receive Loss of Signal—Criteria for detection and clearance of RLOS per ITU G.775 and
T1.231.
RDIGI
Mode
Mode
E1
E1
T1
T1
T1
T1
E1
E1
0
0
1
1
for set/clear criteria.
0 = No alarm
1 = Receive Yellow Alarm
RALOS
RLOS
RAIS
0
1
0
1
0
1
0
1
0
1
0
1
Conexant
for a mode summary and
Cleared if two consecutive double frames (500 s)
each contain three or more zeros out of 512 bits, or if
FAS alignment is recovered [FRED = 0; addr 049].
Set if two consecutive double frames each contain two
or fewer zeros out of 512 bits, and when FAS
alignment is lost [FRED = 1; addr 049].
Cleared if data received for a period of 3 ms contains
five or more zeros out of 4,632 bits, or if the frame
alignment is recovered [FRED = 0; addr 049].
Set if data received for a period of 3 ms contains four
or fewer zeros out of 4632 bits, and the frame
alignment is lost [FRED = 1; addr 049].
Cleared if AGC gain setting is less than VGA_MAX.
Set if AGC gain setting equals VGA_MAX [addr
024]. This indicates that the RTIP/RRING input
signal amplitude remains below the programmed
input signal threshold for more than 1 ms.
Cleared if RCKI transitions at least once in 125 s.
Set when RCKI remains low for 125 s.
Cleared if the received data sustains an average pulse
density of 12.5% over a period of 114 bits, starting
with the receipt of a pulse—and no occurrence of 100
consecutive zeros.
Set if 100 consecutive zeros are received.
Cleared upon reception of 192 bits in which no
interval of 32 consecutive zeros appears where the
192-bit window begins with receipt of a pulse.
Set upon reception of 32 consecutive 0s.
Set/Clear Criteria
Set/Clear Criteria
Set/Clear Criteria
Table 3-13, Receive Yellow Alarm
3.8 Receiver Registers
3-55