Adtran TRC3202 用户手册
Section 4, Trouble Shooting Guide
TRACER 2210/3202 System Manual
50
© 2001 ADTRAN, Inc.
61280012L1-1A
2210 to DTE (V.35) Loopback
Performs a loopback at the V.35 DTE data interface. All received V.35 data is looped back in the transmit
direction toward the DTE equipment. This loopback is useful for diagnosing DTE device configuration
and setup.
direction toward the DTE equipment. This loopback is useful for diagnosing DTE device configuration
and setup.
2210-to-Radio Loopback
Performs a loopback at the line interface inside the TRACER 2210 unit directed back toward the host 3202
unit. This loopback is useful for diagnosing problems in the TRACER 3202 radio units.
unit. This loopback is useful for diagnosing problems in the TRACER 3202 radio units.
Radio Cable Loopback
Performs a loopback at the line interface inside the TRACER 3202 radio unit directed back toward the host
2210 unit. This loopback is useful for diagnosing the radio cable connecting the 2210 and 3202 units, in
addition to differentiating between radio link errors on the remote or local ends of the link.
2210 unit. This loopback is useful for diagnosing the radio cable connecting the 2210 and 3202 units, in
addition to differentiating between radio link errors on the remote or local ends of the link.
Far 2210 Loopback
Effectively performs a 2210-to-Radio loopback on the remote TRACER 2210 unit. This loopback
exercises the majority of the system circuitry and is useful for verifying end-to-end operation from a single
location.
exercises the majority of the system circuitry and is useful for verifying end-to-end operation from a single
location.
7.
TEST PATTERNS
The TRACER 2210/3202 has several data test patterns available to test bit integrity throughout the system.
Typically these patterns are used in conjunction with a loopback option to determine which system device
is demonstrating faulty behavior. The available patterns are a 511 pattern, a QRSS pattern, and a 1-in-8
pattern (1:8). Additionally, most third party test equipment will recognize and can operate with these three
standard patterns.
Typically these patterns are used in conjunction with a loopback option to determine which system device
is demonstrating faulty behavior. The available patterns are a 511 pattern, a QRSS pattern, and a 1-in-8
pattern (1:8). Additionally, most third party test equipment will recognize and can operate with these three
standard patterns.
1-in-8 Pattern
The 1-in-8 (1:8) pattern is simply a repetition of the binary data sequence 10000000. The 1:8 pattern is
useful when needing to identify a regular data stream through the system.
useful when needing to identify a regular data stream through the system.
511 Pattern
The 511 pattern is a pseudo-random data sequence that repeats every 511 bits. It is a relatively short
periodic sequence that can be used to simulate live data. The 511 pattern is generated by a length-9 shift
register with the logical exclusive-or of registers 9 and 5 being fed back to register 1.
periodic sequence that can be used to simulate live data. The 511 pattern is generated by a length-9 shift
register with the logical exclusive-or of registers 9 and 5 being fed back to register 1.
QRSS Pattern
The QRSS pattern, or quasi-random signal sequence, is a test sequence designed to simulate live data
traffic. It is based on a length-20 shift register with the logical exclusive-or of registers 17 and 20 being
fed back to register 1. The shift register contents are monitored for runs of 14 consecutive zeros, in which
case the QRSS generator will force the output to logic-1 to proceed the run of zeros. The QRSS pattern is
designed to have a 1-to-0 ratio of 1:1.
traffic. It is based on a length-20 shift register with the logical exclusive-or of registers 17 and 20 being
fed back to register 1. The shift register contents are monitored for runs of 14 consecutive zeros, in which
case the QRSS generator will force the output to logic-1 to proceed the run of zeros. The QRSS pattern is
designed to have a 1-to-0 ratio of 1:1.
.... 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 ....