DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1590SYS-LINK (System Links)
9
Display Errors/Alarms
The output of the display errors or display alarm commands shows the location
of the syste m link for en tries with a Maint enanc e Na me of SYS- LINK. You can
restrict the scope of the outp ut of these commands by sp ecifying sys-link in the
Category field on the input form. The link type and c hannel number, if any, are
listed under the Alt Name field of the rep or t.
List sys-link
The list sys-link com mand lists all system links (loca tion, link type, and channel
number) present in the system.
NOTE:
In case of the X.25 link type, a single end point carries multip le links. A
combination of the endp oint and channel numb er is used to uniquely
identify the link. All other links can be uniq uely identified by their end points.
Common Procedure for Repairing Link Problems
The state of a system link is dependent on the state of the various hardware
components that it travels over. To resolve any problems as sociated with a
system link, use the following proc edure.
The switch maintains a list of hardware comp onents over which the link travels,
called the hardware pa th. There are two hardware paths: the current hardware
path and the faulted hard ware path for each of the system links. The cu rrent
hardware path is present only for those link s that are currently up. When a link is
down, the current hardware path is em pty. The faulted hardware path is always
present once the link has gone down and is

not cleared when the link

subsequently recovers.

The faulted path preserves the p ath that the link
traversed when it last went down. The time at whic h the faulted path was last
recorded is preserved and is accessib le through the status sys-link
location
and list sys-link commands. Therefore, the focus of attention for p roblems which
do not involve a link that is down is the current hardw are path. If the link is down,
faulted hardware path is the foc us of attention.
The status sys-link
location
command shows the state of b oth the hardware
paths (current and faulted ) along with the state of each of the comp onents in the
hardware path. When analyzing any system li nk problem
1. Look for alarms on the components list ed under desired ha rdware path.
2. If any alarms are present, then follow the maintenanc e procedures for the
alarmed components to clear those alarms first.
NOTE:
For systems using ATM EI PNC (TN2238 circuit pack) and where link
alarms are present, refer to ‘‘ATM-BCH (ATM B-Channel Trunk)’’ and
the ‘‘ATM Tips’’ section in Chapter 5.