Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
3.12 Transmitter Registers
TVERR
Inject Line Code Violation—Injects a single LCV error depending on the line mode and the
selected ZCS. In T1 mode, the LCV injector waits for transmission of two consecutive pulses
on the data output before performing BPV error insertion and clearing the TVERR bit. A BPV
error cannot be injected into a transmit data stream that does not contain two consecutive 1s.
TVERR is latched until an opportunity to inject a BPV error is presented, thus preventing the
receiving end from detecting frame or multiframe bit errors, CRC errors, multiple BPV errors
(due to ZCS pattern corruption), or PRBS test pattern bit errors as a consequence of error
insertion. In E1 mode with HDB3 selected, the LCV injector sends two consecutive BPVs of
the same polarity, which causes the receiving end to detect a single LCV error.
0 = no effect
1 = inject line code violation
074—Transmit Manual Sa-Byte/FEBE Configuration (TMAN)
7
6
5
4
3
2
1
0
INS_SA[8]
INS_SA[7]
INS_SA[6]
INS_SA[5]
INS_SA[4]
FEBE_II
FEBE_I
TFEBE
INS_SA[8]
Manual Sa8-Byte Transmit (0-bypass)
Manual Sa7-Byte Transmit (0-bypass)
Manual Sa6-Byte Transmit (0-bypass)
Manual Sa5-Byte Transmit (0-bypass)
Manual Sa4-Byte Transmit (0-bypass)
INS_SA[7]
INS_SA[6]
INS_SA[5]
INS_SA[4]
FEBE_II
Bit to manually transmit in FEBE bit position of Frame 15.
Bit to manually transmit in FEBE bit position of Frame 13.
FEBE_I
TFEBE
Manual Transmit FEBE (Overrides INS_FE; addr 072)—Provides a manual override for
FEBE bits that are normally sent by the alarm formatter [INS_FE; addr 072]. When active,
FEBE_I controls the data output in TS0 bit 1 of frame 13 (FEBE13), and FEBE_II controls the
data output in TS0 bit 1 of frame 15 (FEBE15).
INS_FE TFEBE FEBE[13] FEBE[15]
Description
Bypass FEBE
Automatic FEBE
Manual FEBE
0
1
1
X
0
TPCMI
SMF I
TPCMI
SMF II
1
FEBE_I
FEBE_II
NOTE: Automatic FEBE insertion uses two CRC4 error signals from the receiver to
indicate SMF I and SMF II errors. Each error signal is latched and held for one
full multiframe to compensate for phase differences between receive and transmit
multiframe timing.
N8370DSE
Conexant
3-75
CONEXANT [ CONEXANT SYSTEMS, INC ]
