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ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1
7-119
Interface This field is not available unless the Connect field is translated pbx. Field encodes
and their descriptions are:
●
●
user (default option)
network
NOTE: For ISDN-PRI private network connections, additional care must
be exercised in defining user and network sides. Specifically, only one end
must be administered user side, while the alternate must be defined as
network side. If the private network node is a tandem switch, then that
node may function as both user side and network side depending on the
particular facility.
Maintenance Options or Parameters
Slip
This option enables (y) or disables (n) switching between the primary, secondary,
Detection
and internal high-accuracy clock. The decision to switch from one source to the
other is based on an internal slip count calculation.
Remote
Loop
Around
NOTE: Those DS1/T1 facilities that are used to provide the primary and
secondary synchronization reference should be administered for slip detection
y. Typically, those other DS1/T1 spans that are used for data applications and
deemed important should also be administered for slip detection. All T1-spans
connecting channel banks are excluded, unless the channel bank is externally
timed. Normally, those DS1/T1 spans used exclusively for voice and not
assigned as the primary or secondary synchronization source should be
administered for slip detection of n. Refer to the network synchronization
diagram to determine which option to choose.
The digital switch maintains a slip count record for each DS1 Interface. The slip
count is used to determine if the T1-span is experiencing errors and, if so, the
severity of the errors (type alarm). Option y enables switching between the
primary, secondary, or internal high-accuracy clock.
NOTE: If as many as 50% of those spans that are administered for slip
detection are experiencing slips (with respect to the primary), then a decision is
made to switch to the secondary.
Option y is equivalent to a 1 in field 10 of procedure 260.
Option y is only used during some phases of DS1/DMI diagnostic testing. The
normal or operational choice is n. Option n is equivalent to a 0 in field 11 of
procedure 260.
Network Synchronization Options — DS1 and ISDN-PRI Applications
The
SYNCHRONIZATION PLAN screen is used to specify which of the two DS1/T1-spans (that were
previously administered with slip detection y) is the primary reference source and which is the
secondary reference source. Figure 7-62, Synchronization Plan Screen, depicts this procedure.