BertPatterns

• Base type Enumeration

The patterns that can be configured to perform BER Test on an interface. Bit error measurements are widely used to assess the performance of a digital transmission equipment. Precise error measurement requires that the bit pattern transmitted is known before hand. During BER testing a known pattern is transmitted on a interface. The pattern received on the receive side is checked for bit errors. In order to measure the performance of digital line under real condition this patterns should also simulate real traffic as closely as possible. There are two categories of test patterns that can be generated by a BERT equipment: repetitive and pseudo-random. The former test patterns are zeroes or ones or alternating zeroes and ones; the latter patterns are exponential numbers and conform to CCITT/ITU O.151, O.153. There are different patterns for different interface speeds. This object allows the user to configure this BERT patterns. The supported values are : Repetitive Patterns allZeros(1): All Zeroes(Continuous spaces). This is repeating pattern of zeros(...000...). The use of this pattern is to test and verify that the ones density policing mechanism is functioning properly. This pattern must be used in circuits optioned for B8ZS. allOnes(2): All Ones(Continuous Marks). This is repeating pattern of ones(...1111...). This provides testing of maximum power level requirements. The all one pattern test causes the repeater to consume the maximum amount of power. If there is insufficient DC span power then the repeater may begin to fail. Typically this pattern is used for a simple continuity check. It may also be used to detect the presence of unwanted loop in the network. altOneZero(3): Alternate one/zero pattern(..1010..). This pattern produces a 50% ones density. It is used to stress the repeater's DC power consumption. doubleAltOnesZeros(4): Double alternate one/zero(..1100..). oneIn4(5): This pattern is standard loop up remote code. Typically it is used when the loop up remote test fails to place the remote system into loopback. oneIn8(6): This is an eight bit pattern which contains single one. This pattern is used primarily to test timing(clock) recovery and may be used framed or unframed for that purpose. This pattern is used to verify frame synchronization by providing the minimum acceptable pulse density. oneIn16(7): N repetitive pattern, 1 in 16. threeIn24(8): This is a 24 bit pattern which contains 3 ones. The largest string of consecutive zeros is fifteen. This pattern is used primarily to test timing(clock) recovery and may be used framed or unframed for that purpose. This pattern covers both the minimum ones density and the maximum number of consecutive zeros. inbandLoopup(9): D4/SF Loopback activate. Valid only for T1 line. inbandLoopdown(10): D4/SF Loopback deactivate. Valid only for T1 line. Pseudo-Random Patterns twoE3MinusOne(11): This is 2^3-1 (7 bits in length) pattern. twoE4MinusOne(12): This is 2^4-1 (15 bits in length) pattern. twoE5MinusOne(13): This is 2^5-1 (31 bits in length) pattern. twoE6MinusOne(14): This is 2^6-1 (63 bits in length) pattern. twoE7MinusOne(15): This is 2^7-1 (127 bits in length) pattern. twoE7MinusOneFT1Loopup(16): 2^7-1 Fractional T1 Loop Back Activate. twoE7MinusOneFT1Loopdown(17): 2^7-1 Fractional T1 Loop Back Deactivate. twoE9MinusOne(18): This is 2^9-1(511 bits in length) pattern specified in ITU O.153. It has the maximum of 8(non-inverted) sequential zeros and 9 sequential ones. twoE10MinusOne(19): This is the 2^10-1(1023 bits in length). twoE11MinusOne(20): This is the 2^11-1(2047 bits in length) pattern specified in ITU O.152, O.153. It has a maximum of 10(non-inverted) sequential zeros and 11 sequential ones. This pattern is primarily intended for error measurements at bit rates of 64kbit/s and N*64 kbit/s. twoE15MinusOne(21): This is the 2^15-1(32767 bit length) pattern as specified in ITU O.151. It has the maximum of 15(inverted) sequential zeros. This sequence is primarily intended for error and jitter measurements at bit rates of 1544, 2048, 6312, 8448, 32064 and 44736 kbit/s. twoE17MinusOne(22): This the 2^17-1(131071 bits in length). twoE18MinusOne(23): This the 2^18-1(262144 bits in length). twoE20MinusOne(24): This the 2^20-1(1048575 bits in length) pattern specified in ITU O.153.It has the maximum of 19(non-inverted) sequential zeros. This pattern is primarily intended for error measurements at bit rates up to 73kbit/s. This pattern stresses the equalization and timing recovery circuitry of line repeaters. twoE20MinusOneQRSS(25): This is the 2^20-1(1048575 bits) pattern specified in ITU O.151. This is the pattern with Zero suppression(Quasi Random Signal Source This provides the simulation of live data. This is primarily intended for error and jitter measurements at bit rates of 34368, 139264 kbit/s. twoE21MinusOne(26): This is the 2^21-1(2097151 bit length). twoE22MinusOne(27): This is the 2^22-1(4194303 bit length). twoE23MinusOne(28): This is the 2^23-1(8388607 bit length) pattern specified in ITU O.151. Highest stress pseudo-random pattern, with a maximum of 23 (inverted) sequential zeros and 23 sequential ones. This sequence is primarily intended for error and jitter measurements at bit rates of 34368 and 139264 kbit/s. twoE25MinusOne(29): This is the 2^21-1 (33554431 bit length). twoE28MinusOne(30): This is the 2^28-1 (268435455 bit length). twoE29MinusOne(31): Highest stress pseudo random pattern, with a maximum of 29 (inverted) sequential zeros Specified in ITU 0.150. twoE31MinusOne(32): It has maximum 31 sequential zeros. DDS is a special service for transmitting data in a DS-1 frame. dds1pattern(33): This sends 100 bytes of all 1s and then 100 bytes of all 0s to test the stress clocking of the network. dds2pattern(34): This sends 100 bytes of a 0x7e pattern and then 100 bytes of all 0s. This pattern simulates bit oriented protocol flags for DDS testing. dds3pattern(35): This pattern sends continuous bytes of a 0x46 pattern. It is used to simulate a typical DDS signal. dds4pattern(36): This pattern sends continuous bytes of a 0x02 pattern. It is used to stress DDS clock recovery. dds5pattern(37): This pattern sends continuous bytes of a 0x02 pattern. It is used to stress DDS clock recovery. userPattern(38): This is any user defined pattern.