Table 4. Screen Abbreviations - ADTRAN 220 HDSL4 Installation And Maintenance Practice

Many portable personal computers use power-saving
programs that are known to interfere with applications
running on the personal computer. If using a portable
personal computer with terminal emulation capability,
communication between the computer and the HDSL4
unit may be periodically disrupted if power saving
programs are being used on the personal computer.
The symptoms may include misplaced characters
appearing on the screen and/or the occurrence of
screen time outs. These symptoms are not disruptive
to the operation of the circuit and are avoidable if the
power saving options are disabled or removed.
Abbreviation Definition
ES ....................... Errored Seconds
DSX/DS1
SF ....... Second in which a BPV or frame bit error occurs
ESF ..... Second in which a BPV or CRC error occurs
HDSL4 ...... Second in which a CRC error occurs
SES ..................... Severely Errored Seconds
DSX/DS1
SF ....... Second in which 1544 BPVs or 8 frame bit errors occurs
ESF ..... Second in which 1544 BPVs or 320 CRC errors occur
HDSL4 ...... Second in which 50 CRC errors occurs
UAS .................... Unavailable Seconds
DSX/DS1 .. Second in which there is a loss of signal or sync
HDSL4 ...... Second in which there is a loss of signal or sync
SF ........................ Superframe Format
ESF ..................... Extended Superframe Format
B8ZS ................... Bipolar with 8 Zero Substitution
AMI .................... Alternate Mark Inversion
LBO .................... Line Build Out
BPV .................... Bipolar Violation
DSX/DS1 .. Second in which a bipolar violation occurs
NIU ..................... T1 Network Interface Unit
S/N ...................... Serial Number
15M ..................... 15-minute period
24H ..................... 24-hour period
61222401L1-5C
Operation
For abbreviations used in the screen diagrams, see
Table 4.
The screens illustrated in Figure 6 through Figure 21
are for an HDSL4 circuit deployed with ADTRAN's
HDSL4 technology. The circuit includes an H4TU-C,
up to two H4Rs and an H4TU-R. Other
configurations are possible, and the displays will vary
slightly from those shown in this section.

Table 4. Screen Abbreviations

7