Bt8370/8375/8376
3.15 Bit-Oriented Protocol Registers
Fully Integrated T1/E1 Framer and Line Interface
RBOP_INTEG
RBOP Integration—Requires receipt of two identical, consecutive 16-bit patterns (without
errors or gaps between patterns) to validate a single codeword. In this case, an errored
codeword does not increment the pattern count. RBOP integration must be enabled to meet
codeword detection criteria while receiving a 1E-3 bit error ratio. RBOP_INTEG adds at least
one to the number of successive 16-bit patterns needed to qualify receipt of BOP message (2 in
a row counts as 1 pattern; 11 in a row counts as 10; and 26 in a row counts as 25).
0 = no integration
1 = RBOP integrationRBOP_LEN[1:0]
RBOP Message Length—Selects the number of successive identical 16-bit patterns needed
to qualify receipt of a single BOP message and update RBOP [addr 0A2] with the received
codeword. During this time, the RBOP interrupt [ISR1; addr 00A] is also activated. Successive
patterns can be separated by any number of bits, as long as they do not contain a different valid
codeword.
RBOP_LEN
Successive Patterns
Notes
00
01
10
11
1
10
Single 16-bit pattern updates RBOP
Minimum command, response length
Preferred command, response length
25
Change
RBOP updates on receipt of each new
pattern
TBOP_LEN[1:0]
TBOP Message Length—Selects the number of repeated 16-bit patterns sent as a single
message when a TBOP [addr 0A1] codeword is written. Another message with the same or
different codeword value can be written to TBOP as soon as prior message start is
acknowledged, via activation of a TBOP interrupt [ISR2; addr 009]. If no new message is
written, the FDL channel returns to TDL1 output control upon completion of message
transmission. The processor changes TBOP_LEN to end transmission of a continuously
repeating message.
TBOP_LEN
Repeated
Patterns
Message
Length (ms)
Notes
00
01
10
11
1
10
4
40
Single message sends 16 FDL bits
Minimum command, response length
Preferred command
25
100
Continuous
Continuous
Required for ESF Yellow Alarm
3-88
Conexant
N8370DSE
CONEXANT [ CONEXANT SYSTEMS, INC ]
