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DIDCSU E1 Version
Command
Tn
Test Pattern: Use this option to indicate one of the following options:
• None: This option indicates that no test pattern will be used.
• 3 in 24: Use 3-in-24 ONEs test pattern which consists of three pulses
in every 24-bit sequence (10001000 10000000 00000000). This
stress test is useful for testing circuits under extremely low density
conditions.
• QRSS: Use Quasi-Random Signal Sequence that limits the signal to a
maximum of 15 zeros that can be transmitted sequentially. These
signals contain a medley of 20-bit words (except for more than 15
consecutive 0s). It repeats every 1,048,575 bits. Also, it contains high
density sequences and low density sequences, and sequences that
change from low density to high density and vice versa (as defined by
ANSI T1.403).
20
•
: This pattern tests circuits for equalization and timing. It is the
2
-1
same as QRSS, but without the 15 zeros restriction.
• 1/8: This pattern tests the ability of a circuit to support a pattern
having the minimum ones density (containing 7 zeros indicating
empty pulses and 1 pulse-1000000). It helps discover a timing
recovery problem.
15
•
: This pattern tests circuits for equalization and timing using an
2
-1
alternate pattern for jitter testing. The pattern repeats every 32,757
bits.
• All 0s: This pattern is composed entirely of framed zeros (00000000).
• 55 Octet: The Daly 55 octet pattern is used to test circuits for line
card and timing recovery. By rapidly transitioning from a long
sequence of low density octets to high density octets, the circuit is
stress tested.
• All 1s: This pattern is composed entirely of framed ones (11111111).
It stresses circuits by maximizing power consumption.
E1 Port Diagnostics Menu
X
Exit the
Data Port
Diagnostics
Menu
4-18
Description
For diagnostics on the data port, enter "P" to access the Data Port
Diagnostics Menu. Commands on this menu activate or deactivate
loops from both the data equipment to the DIDCSU data port and
back to the data equipment, and from the network to the data port
and back to the network.
Verilink DIDCSU 2912 User Manual
Options
1) NONE
2) 3/24
3) QRSS
4) 2N20-1
5) 1/8
6) 2N15-1
7) ALL 0'S
8) 55 OCTET
(Daly)
9) ALL 1'S
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