bt8375kpf Conexant Systems, Inc., bt8375kpf Datasheet - Page 190

• Manufacturer Part Number: bt8375kpf
• Description: Single Chip Transceivers For T1/e1 And Integrated Service Digital Network Isdn Primary Rate Interfaces Systems
• Manufacturer: Conexant Systems, Inc.

3.12 Transmitter Registers
TLOFC–TLOFA
TZCS[1:0]
Table 3-20. Transmit Zero Code Suppression
3-72
NOTE(S):
minimum pulse density requirements while these functions are active.
HDB3
TZCS
B8ZS
UMC
PDV
AMI
00
01
01
10
11
PRBS, inband loopback, and YB2 alarm insertion occurs after PDV enforcement; therefore, output data might violate
Prior to transmission, four consecutive 0s are substituted by 000V or B00V code, where B is an AMI pulse, and V is a
Enforcer overwrites transmit 0s that would otherwise cause output data to fail to meet the minimum required pulse
Unassigned Mux Code. DS0 channels containing eight 0s are substituted with the 10011000 code, per Bellcore
Alternate Mark Inversion. Bipolar line code forces successive 1s to alternate their output pulse polarity. Analog and
digital dual-rail outputs are always AMI encoded, although certain AMI codes are modified to include 0 suppression.
bipolar violation. ZCS encoder selects the code that forces the BPV output polarity opposite that of the prior BPV.
Prior to transmission, eight consecutive 0s are substituted by 000VB0VB code, where B is an AMI encoded pulse, and
V is a bipolar violation.
density per ANSI T1.403 sliding window.
NOTE(S):
NOTE(S):
TA-TSY-000278.
NOTE(S):
T1/E1N
X
0
1
1
1
Transmit Loss of Frame Criteria—Determines the number of frame errors that the online
framer must detect before declaring a loss of frame alignment [TLOF; addr 048]. Refer to
TFRAME [addr 070] to find which frame bits are monitored during the selected framer mode.
Transmit Zero Code Suppression—Selects ZCS and Pulse Density Violation (PDV)
enforcement options for XTIP/XRING and TPOSO/TNEGO outputs. B8ZS and HDB3
replace transmitted sequences of eight or four 0s with a recoverable code. These are standard
T1 and E1 line code options, respectively (see
The enforcer never overwrites a framing bit and is not applicable during E1 mode.
Each PDV-enforced 1 causes a nonrecoverable, transmitted bit error.
The receiver's ZCS decoder cannot recover original data content from UMC encoded signal.
T1DM
X
X
X
X
X
NOTE(S):
T1/E1N
0
1
1
1
HDB3
B8ZS
UMC
ZCS
AMI
AMI
All other TLOFC–A combinations are invalid.
TLOFC–A
100
001
010
100
Enforced
None
None
None
None
PDV
Conexant
2 out of 4 frame bit errors
2 out of 5 frame bit errors
2 out of 6 frame bit errors
3 consecutive FAS errors
Reframe Criteria
Fully Integrated T1/E1 Framer and Line Interface
Table
3-20).
Zero Code Substitution
(Sent left to right)
on PDV errors
000V or B00V
000VB0VB
10011000
None
Bt8370/8375/8376
N8370DSE