BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 170

• 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]

3.8 Receiver Registers
RLOF_INTEG
RPCM_AIS
STOP_CNT
LATCH_CNT
3-52
046—Alarm/Error/Counter Latch Configuration (LATCH)
—
7
Enable RLOF Integration—When set, the receive loss of frame status [RLOF; addr 047] is
integrated for 2.0 to 2.5 seconds during T1 framer modes (not applicable to E1 modes). RLOF
interrupt status [ISR7; addr 004] is also integrated. However, receive framer status in ALM3
[addr 049], loss of frame count [FRED[3:0]; addr 05A] and RLOF counter overflow [ISR4;
addr 007] are unaffected. RLOF_INTEG does not meet the requirements of TR62411. To meet
the requirements of TR62411 “Conditions Causing The Initiation of Carrier Failure Alarms,”
the receive loss of frame condition reported by FRED (addr 049) must be integrated before
initiating Yellow Alarm Transmission. This can be accomplished in software by integrating
FRED during an RLOF Interrupt (ISR7; addr 004), with RLOF_INTEG bit cleared.
Send AIS on RPCMO Output Pin—Replaces RPCMO data with a continuous series of all 1s.
RPCM_AIS is useful in CSU or digital section applications, where the local interface must be
able to forward an AIS to the opposing interface.
Stop Error Count during RLOF/RLOS/RAIS—When enabled, error count registers [addr
050–057] are suspended at their present values during one of the following conditions: receive
loss of frame (RLOF), loss of signal (RLOS), or all 1s (RAIS) alarm condition. STOP_CNT
does not affect the counting of test pattern errors [BERR; addr 058, 059] or alarm events
[AERR; addr 05A]. The occurrence of a red or AIS CGA inhibits further processing of all
other performance parameters (i.e., BER, errored seconds, SLIPS). However, a CGA caused
by a Yellow Alarm does not inhibit further alarm or performance monitoring.
Enable ONESEC Latching of Counters—Determines the interval for which error counts
remain held in all count registers [addr 050–057]. LATCH_CNT must be active in T1 mode
whenever automatic 1-second performance report messaging [AUTO_PRM; addr 0AA] is
enabled. LATCH_CNT is active during E1 mode; the processor cannot use the RLOF counter
overflow [addr 007] as a 128 ms MFAS timeout.
current LSB error count, it latches the current MSB error count to the MSB register, and then it
clears LSB. Subsequently, reading the MSB register reports current latched MSB error count
and then clears MSB.
—
When the LATCH_CNT is inactive, the processor read of the LSB register reports the
6
—
5
0 = normal RLOF status
1 = integrated RLOF [addr 047] status
0 = normal RPCMO data
1 = RPCMO replaced with all ones
0 = Continue error count during alarms
1 = Stop error count during alarms
LATCH_CNT
0
1
—
4
Conexant
ONESEC interval
STOP_CNT
Count Latched
3
Never
Fully Integrated T1/E1 Framer and Line Interface
LATCH_CNT
2
ONESEC interval
Count Hold Time
Until read clear
LATCH_ERR
Bt8370/8375/8376
1
LATCH_ALM
N8370DSE
0