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1152700 • Issue 1 • February 2001 • Section 2 Operation and Maintenance
Page 2-231
© 2000, ADC Telecommunications, Inc.
DLP-749
Page 3 of 3
Table 749-1. Timing Resource Configuration Options, continued
SELECTION
(PRIMARY OR SECONDARY)
DEFAULT OPTIONS DEFINITIONS
DS1 Transmit Mode AIS
Threshold
Generation
AIS Threshold
Generation
Message Pass
Through
Only available when Frame Format is
set to ESF. Requires transmitting AIS
over the derived DS1 signals if a clock
reference has degraded below the
threshold quality level.
FDL Receive Enabled Enabled
Disabled
A peer-to-peer protocol across a T1
line providing OA&M functions
(performance monitoring, loop back
etc.) implemented via the framing bits
in the T1 frame.
AIS Threshold N/A PRS
ST1
ST2
ST3
SMC
DUS
Primary Reference Source
Stratum 1 level source
Stratum 2 level source
Stratum 3 level source
SONET Minimum level Clock
Reference should not be used for
source.
Frame Format ESF ESF
SF
N/A
Extended Superframe
Superframe
Not Applicable when a DS1 Output is
not selected.
Encoding Rule B8ZS B8ZS
AMI
N/A
Bit 8 Zero Substitution
Alternate Mark Inversion
Not Applicable when DS1 Output not
selected.
PROTECTION
Switch Command None None
Enable
Manual
No switch command selected.
Enables a switch to take place when
needed, used after a manual switch to
release the manual condition..
Initiates a switch to stand-by clock
source.
Protection Mode
Non
Revertive
Revertive
Non Revertive
Switches back to recovered primary
source following a failure.
Does not automatically revert back to
primary source after a failure recovers.
Revertive Time
(if Revertive)
0 0 to 1800 seconds
N/A
Selectable up to 30 minutes.
Not Applicable if non-revertive.