DS2141AQ+ Maxim Integrated Products, DS2141AQ+ Datasheet - Page 15

• Manufacturer Part Number: DS2141AQ+
• Description: IC CONTROLLER T1 5V 44-PLCC
• Manufacturer: Maxim Integrated Products

Specifications of DS2141AQ+

• Controller Type: T1 Controller
• Interface: Parallel/Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 10mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-LCC, 44-PLCC
• Operating Supply Voltage: 5 V
• Supply Current (max): 10 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SR1: STATUS REGISTER 1 (20h)
LOOP UP/DOWN CODE DETECTION
Bits SR1.7 and SR1.6 will indicate when either the standard “loop up” or “loop down” codes are being
received by the DS2141A. When a loop up code has been received for 5 seconds, the CPE is expected to
loop the recovered data (without correcting BPVs) back to the source. The loop down code indicates that
the loopback should be discontinued. See the AT&T publication TR 62411 for more details. The
DS2141A will detect the loop up/down codes in both framed and unframed circumstances with bit error
rates as high as 10-
48 ms of receiving either code, the proper status bit will be set to a 1. After this initial indication, it is
recommended that the software poll the DS2141A every 100 ms to 500 ms until five seconds have
elapsed to insure that the code is continuously present. Once five seconds have passed, the line interface
should be taken into or out of loopback.
(MSB)
LUP
SYMBOL
LOTC
RYEL
RLOS
LDN
SLIP
RBL
RCL
LUP
LDN
2
. The loop code detector has a nominal integration period of 48 ms. Hence, after about
POSITION
SR1.7
SR1.6
SR1.5
SR1.4
SR1.3
SR1.2
SR1.1
SR1.0
LOTC
NAME AND DESCRIPTION
Loop Up Code Detected. Set when the repeating …00001…
loop up code is being received.
Loop Down Code Detected. Set when the repeating …001…
loop down code is being received.
Loss of Transmit Clock. Set when the TCLK pin has not
transitioned for one channel time (or 5.2 s). Will force pin-34
high if enabled via CCR1.6. Based on RCLK.
Elastic Store Slip Occurrence. Set when the elastic store has
either repeated or deleted a frame of data.
Receive Blue Alarm. Set when an all 1's code is received at
RPOS and RNEG.
Receive Yellow Alarm. Set when a yellow alarm is received at
RPOS and RNEG.
Receive Carrier Loss. Set when 192 consecutive 0s have been
detected at RPOS and RNEG.
Receive Loss of Sync. Set when the device is not synchronized
to the receive T1 stream.
SLIP
15 of 39
RBL
RYEL
RCL
(LSB)
RLOS
DS2141A