Avaya Communication Manager Administrator's Manual page 899

Slip Detection
Slips — synchronization errors — slow digital transmissions and can result in data loss. The
server maintains a slip-count record for each DS1 interface to detect errors and evaluate their
severity (the type of alarm). If as many as 50 percent of those spans administered for slip
detection are experiencing slips (with respect to the primary), then a decision is made to switch
to the secondary.
!
CAUTION:
Always enter y for DS1 circuit packs that serve as primary or secondary
CAUTION:
synchronization references.
Valid entries
y
n
Block Progress Indicator
This field allows you to block sending of the progress indicator in the SETUP message. It
appears when the Country Protocol field is set to 1 and the Protocol Version field is set to b.
Valid entries
y
n
Usage
Enter y to allow maintenance software to measure the
slip-rate of this circuit pack and determine whether it's
excessive. Typically, enter y for DS1 spans used for
data applications and for spans used as synchronization
references. This excludes all T1-spans connecting
channel banks, unless the channel bank is externally
timed. This entry enables switching between the primary
and secondary synchronization references and an
internal high-accuracy clock.
Enter n for DMI-BOS links or when testing is not
required. Normally, enter n for DS1 spans that are used
exclusively for voice and that do not serve as the
primary or secondary synchronization source.
Usage
Enter y(es) to prevent the progress indicator from being
sent in the SETUP message.
Enter n(o) to allow the progress indicator to be sent.
DS1 Circuit Pack
Issue 1 June 2005 899