DS2151QNB+ Maxim Integrated, DS2151QNB+ Datasheet - Page 29

• Manufacturer Part Number: DS2151QNB+
• Description: Network Controller & Processor ICs
• Manufacturer: Maxim Integrated

Specifications of DS2151QNB+

• Product: Framer
• Number Of Transceivers: 1
• Data Rate: 2.048 Mbps
• Supply Current (max): 65 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: PLCC-44
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 5 V
• Supply Voltage - Max: 5.25 V
• Supply Voltage - Min: 4.75 V
• Part # Aliases: 90-2151Q+NB0

6.3 Multiframes Out of Sync Count Register (MOSCR)
Normally the MOSCR is used to count the number of multiframes that the receive synchronizer is out of
sync (RCR2.0 = 1). This number is useful in ESF applications needing to measure the parameters Loss Of
Frame Count (LOFC) and ESF Error Events as described in AT&T publication TR54016. When the
MOSCR is operated in this mode, it is not disabled during receive loss of synchronization (RLOS = 1)
conditions. The MOSCR has alternate operating mode whereby it will count either errors in the Ft
framing pattern (in the D4 mode) or errors in the FPS framing pattern (in the ESF mode). When the
MOSCR is operated in this mode, it is disabled during receive loss of synchronization (RLOS = 1)
conditions. See
MOSCR1: MULTIFRAMES OUT OF SYNC COUNT REGISTER 1 (Address = 25
Hex)
MOSCR2: MULTIFRAMES OUT OF SYNC COUNT REGISTER 2 (Address = 27
Hex)
Note 1: The lower nibble of the counter at address 25 is used by the Path Code Violation Count Register.
Note 2: MOSCR counts either errors in framing bit position (RCR2.0 = 0) or the number of multiframes out of sync (RCR2.0 = 1).
Table 6-3. Multiframes Out of Sync Counting Arrangements
FRAMING MODE
MOS/FB11
MOS/FB7
(MSB)
MOS/FB11
SYMBOL
MOS/FB0
(CCR2.3)
ESF
ESF
D4
D4
MOS/FB10
MOS/FB6
Table 6-3
COUNT MOS OR F-BIT
ERRORS? (RCR2.0)
for a detailed description of what the MOSCR is capable of counting.
MOS/FB9
MOS/FB5
POSITION
MOSCR1.7
MOSCR2.0
MOS
MOS
F-Bit
F-Bit
MOS/FB8
MOS/FB4
NAME AND DESCRIPTION
MSB of the 12-Bit Multiframes Out of Sync or F-Bit
Error Count (Note 2)
LSB of the 12-Bit Multiframes Out of Sync or F-Bit Error
Count (Note 2)
MOS/FB3
29 of 60
Number of multiframes out of sync
Errors in the Ft pattern
Number of multiframes out of sync
Errors in the FPS pattern
(Note 1)
WHAT IS COUNTED
IN THE MOSCRs
MOS/FB2
(Note 1)
MOS/FB1
(Note 1)
MOS/FB0
(Note 1)
(LSB)
MOSCR1
MOSCR2