Lucent Technologies Definity Release 8.2 Atm Installation Manual

							DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration  555-233-124  Issue 1
April 2000
Troubleshooting 
6-37 Troubleshooting ATM-PNC 
6
ATM call control
Are ATM signaling connections being setup to ATM switch Call Control?
The UBR virtual c irc uits b etween the ATM switc h PPN p ort and  ATM switc h p ort 
and  b etween the 
EPN p ort and  ATM switc h p ort are ATM sig naling  c hannels 
b etween the p ort network and  the ATM switc h. They are used  to req uest 
c onnec tion setup s and  releases to other end  p oints suc h as another p ort 
network. These are estab lished  b y eac h TN2305/TN2306 when it c omes up, 
indep end ent of DEFINITY Call Proc essing.
Other UBR virtual c irc uits may exist b etween ATM switc h p orts that are not 
assoc iated  with DEFINITY p ort networks and  may b e sig naling  c hannels for other 
ap p lic ations (for examp le, d ata network traffic ).
Call processing (CaPro) Layer
Are control channels being established from the PPN to the EPN?
Diagnostics. 
nDo you g et a d ial tone on a set on the port network in q uestion?
nCan you ring  a set on the EPN d ialing  from the PPN and  vic e-versa?
Table 6-11. Observed Cause Codes
Cause 
Code Definition Observed Cause
3 No route to d estination The ATM add resses ad ministered in the ATM switch or 
in DEFINITY (display atm pnc) are inc orrec t.
31 Normal, unsp ec ified This is a normal return.
41 Temp orary failureThis “ try ag ain later”  cause c od e has been observed 
when the sourc e of the p roblem is on another port (for 
example, a routing  prob lem on another p ort that 
d isp lays c ause c od e 3).
47 Resourc es unavailab le, 
unsp ec ifiedDEFINITY c all volume is too high for the available 
resources in the ATM network.
63 Service or option unavailab le, 
unsp ec ifiedDEFINITY c all volume is too high for the available 
resources in the ATM network. 
						

							DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration  555-233-124  Issue 1
April 2000
Troubleshooting 
6-38 Troubleshooting ATM-PNC 
6
Are talk paths being established between port networks?
Diagnostics. 
nCan you talk b oth ways on a set on one p ort network d ialed  from another 
port network and vice versa?
— The CBR (Constant Bit Rate) virtual c irc uits (VCs) b etween ATM 
switc h PPN p ort and  ATM switc h EPN p ort are used for talk p aths 
b etween p ort networks (PPN to EPN, EPN to PPN, or EPN to EPN).
— They are estab lished  when c alls are first setup between p ort 
networks. Eac h virtual c irc uit rep resents one p arty of a c omp lete 
multip arty talk p ath.
— These virtual c irc uits may p ersist b eyond  the d uration of a p hone 
call. The DEFINITY Call Processing  software saves virtual circuits 
for a few sec ond s after the end  stations have hung  up in c ase the 
VC c an b e used  ag ain for another c all b etween the same two p ort 
networks. Also, c hec k 3-way c onferenc e c alling  ac ross 3 port 
networks.
— There may b e other CBR virtual c irc uits between ATM switc h p orts 
that are not assoc iated  with DEFINITY p ort networks. A c ommon 
CBR ap p lic ation is Circ uit Emulation, in whic h T-1, T-3, and  so forth 
c irc uits are c arried  over ATM.
Unusual ATM trouble conditions 
A few failure mod es in the DEFINITY ECS/ATM switc h c omb ination are 
p artic ularly d iffic ult to d iag nose. One examp le mig ht b e that you c annot make a 
completely succ essful c all even though most indications from DEFINITY ECS and 
the ATM switch look good. 
This sec tion d oc uments some hints and  c lues that may help d iag nose the 
following  failure mod es:
nIncorrectly typed or omitted EPN route or end system identifier (ATM 
switch)
nSwapped routes, end system identifiers, or fiber between a PPN and an 
EPN
nSwapped routes, end system identifiers, or fiber between A- and B-side 
TN2305/TN2306s on EPN
nSwapped routes, end system identifiers, or fiber between two EPNs 
						

							DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration  555-233-124  Issue 1
April 2000
Troubleshooting 
6-39 Troubleshooting ATM-PNC 
6
Incorrectly typed or omitted EPN route or 
end system identifier (ATM switch)
Symptoms
Talk p aths are one-way, from the PPN to the EPN: you c an hear tones from the 
PPN end  station to the EPN end  station b ut not vic e versa. Bec ause the sig naling  
c hannels are b id irec tional virtual c irc uits (VCs) estab lished from the PPN to the 
EPN, these c an b e routed  c orrec tly and  c ome up  just fine. Talk p aths are two 
unid irec tional virtual c irc uits, so a sing le c all has one VC from the PPN to the EPN 
(whic h is routed  c orrec tly) and  one VC from the EPN to the PPN (whic h c annot b e 
routed ).
Diagnostics
1. At the ATM switc h, c hec k the ATM ad dresses.
2. Look for a c ause c od e 3 (No route to destination
).
Action
1. Correc t the ATM ad d ress translations in the ATM switc h.
Swapped routes, end system identifiers, or fiber
between a PPN and an EPN
Symptoms
nAn inc orrec tly c onnec ted EPN TN2305/TN2306 c irc uit p ac k is not 
c omp letely inserted . 
nDial tone is p resent on end  stations on the PPN and  on c orrec tly 
c onnec ted  EPNs, b ut no d ial tone is p resent on the affec ted  EPN end  
stations.
nCalls c annot b e mad e b etween the PPN and  the c orrec tly c onnec ted  
EPNs b ec ause talk p aths c annot b e routed  c orrec tly.
Diagnostics
1. Chec k to see if the ATM switc h shows VBR c ontrol c hannels from the ATM 
switc h p ort intend ed for the inc orrec tly c onnec ted  EPN (b ut ac tually 
c onnec ted  log ic ally or p hysic ally to the PPN) that should  not exist.
Action
1. Correc t the ATM ad d resses (or swap  fibers) on the ATM switc h b etween 
the inc orrec tly c onnec ted  PPN and  EPN. 
						

							DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration  555-233-124  Issue 1
April 2000
Troubleshooting 
6-40 Troubleshooting ATM-PNC 
6
Swapped routes, end system identifiers, or fiber
between two EPNs
Symptoms
nAll TN2305/TN2306 c irc uit pac ks are c ompletely inserted .
nThe PPN c old  starts b oth inc orrec tly c onnec ted  EPNs as usual.
nBo t h  EPN s  lo g  m a n y WRONG BOARD INSERTED
 errors (list configuration 
all
 or display circuit-packs 
carrier), p rovid ing  the EPNs ac tually d o have 
d ifferent c irc uit p ac ks c onfig ured  in the same slots.
nSome end  stations may work if they are c onnec ted  to the c orrec t c irc uit 
p ac k in the same slot on b oth EPNs. Otherwise, end  stations on the PPN 
have dial tone, while end  stations on the EPNs d o not.
nAll ATM switc h d iag nostic  c ommand s look g ood .
Diagnostics
1. Check log for WRONG BOARD INSERTED
 errors (list configuration all
 or 
display circuit-packs 
carrier).
Action
1. Correc t the ATM ad d resses (or swap  fibers) on the ATM switc h b etween 
the inc orrec tly c onnec ted  EPNs.
Swapped routes, end system identifiers, or fiber
between A- and B-side TN2305/TN2306s on EPN
Symptoms
nThe PPN estab lishes links to what it thinks is the ac tive TN2305/TN2306 
c irc uit p ac k on the EPN.
nAs normal, it reb oots this TN2305/TN2306 c irc uit p ac k, and  when 
c omp lete, it resets the EPN. When this hap p ens, the ac tive (instead  of the 
stand b y) TN2305/TN2306 c irc uit p ac k reboots, d ropp ing  the links.
nTo rec over, the PPN re-estab lishes links to what it thinks is the ac tive 
TN2305/TN2306 c irc uit p ac k and  the c yc le repeats ind efinitely.
Diagnostics
1. Type status pnc
 and  p ress En t e r. The screen shows both the A-side and 
B-sid e State of Health
 field  as partially functional
.
Action
1. Correc t the ATM ad d resses (or swap  fibers) on the ATM switc h b etween 
the A and B side of the EPN. 
						

							DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration  555-233-124  Issue 1
April 2000
Troubleshooting 
6-41 Troubleshooting ATM-PNC 
6
DEFINITY ECS ATM-PNC troubleshooting
commands 
Wid e-area networks (WAN), esp ec ially those c onstruc ted  as an internet using  
p ub lic  network fac ilities, may take inter-PN c onnec tivity to the ed ge of 
ac c ep tab le p erformanc e. The switc h may exp erienc e d elays, b loc kag es, or 
c onnec tion losses b ec ause of c irc umstanc es b eyond  the c ontrol of switc h 
manag ement. Variations in p erformanc e may be exp ec ted  during  p eriod s of hig h 
traffic .
If ATM-PNC is enab led  (change system-parameters customer-options
), 2 
c ommand s b ec ome availab le:
nchange/display atm pnc-pairs 
lets you g et inter-p ort-network 
measurements for up  to 10 ord ered  p airs of port networks
nlist measurements atm pnc-latency
 rep orts d ata ab out ATM c ell latenc y 
and  c onnec tion times.
In b oth of these c ommand s, you must supp ly the following  information:
nthe numb er of c onnec tions req uested,
nthe averag e c onnec tion setup  time in millisec ond s, 
nthe numb er of ATM network setup  req uests required , and  
nthe averag e setup  time for the ATM c onnec tions. 
Sep arate sets of measurements are availab le for the A and  B sid es in c ritic al 
reliability systems.
change/display atm pnc-pairs
This c ommand  lets you selec t 10 p airs of port networks for whic h measurements 
can be reported. Screen 6-16
 shows the output for the c ommand . 
						

							DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration  555-233-124  Issue 1
April 2000
Troubleshooting 
6-42 Troubleshooting ATM-PNC 
6
Screen 6-16. PNC measurements pairs screen (change/display atm pnc-pairs)
Field descriptions
list measurements atm pnc-latency
This command reads and displays the collected information regarding ATM cell 
latenc y and  c onnec tion times. The c ommand -line syntax is: 
nlist measurements atm pnc-latency
 [last-hour, today-peak, 
yesterday-peak
] [print | schedule] 
NOTE:
If a PN p air is c hanged  d uring  a 24-hour p eriod, the p eak value rep orted  for 
the (new) p air is the hig hest latenc y measured  after the c hang e. If you typ e 
list measurements atm pnc-latency
 and press 
En t e r while the PNC 
d up lic ation feature is d isab led , the outp ut c ontains d ata for A-PNC only.
Measurements are d isp layed  only for administered  p nc -p airs. That is, if 5 p airs 
were ad ministered  on the ATM PNC Measurements Pairs sc reen, the list 
measurements atm pnc-latency
 outp ut c onsists of 5 measurement entries. If 
the system time has been mod ified throug h the set time
 c ommand  d uring  any 
measurement hour Y, that measurement hour is d isp layed  as Y** instead  of Y00, 
to ind ic ate that the d ata for that hour may b e invalid .Pair
Id entifies the p ort network p air numb er (read  only).
Orig PN
Dest PNThese entries id entify the originating port network and  the 
d estination p ort network for the measured  SVCs (values 
are b etween 1 and 44; d efault is blank
).
change atm pnc-pairs
                            PNC MEASUREMENTS PAIRS
Pair  Orig  Dest
      PN    PN
1     1 
    5 
2     1     8 
3     5     8 
4     5     7 
5     4     2 
6     10    11
7     10    12
8     10    1 
9     1     10 
						

							DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration  555-233-124  Issue 1
April 2000
Troubleshooting 
6-43 Troubleshooting ATM-PNC 
6
If an ad ministered pnc -p air is c hang ed , the next time measurements are 
g athered , the 
today-peak entry for the old  p nc -p air is rep lac ed  with an entry for 
the new pair, and  all c ounters are set to 0.
Screen 6-17
 shows the output for this c ommand .
Screen 6-17. ATM-PNC latency measurements
Field descriptions
Conserving ATM bandwidth 
Port Networks in a DEFINITY ATM-PNC c onfig uration, when used  with the Luc ent 
ac c ess c onc entrators or other ATM switc hes interfac ing  to 
b and wid th-c onstric ted  or c ong ested  fac ilities, c an inc ur c ontention for 
b and wid th, resulting  in failed  c all c omp letions. Figure 6-4
 rep resents a DEFINITY  Orig PN/Dest 
PNId entifies the orig inating p ort network and  the d estination p ort 
network for the measured  SVCs (d efault is b lank).
PN Count
The numb er of setup  attemp ts on the p ort network
Connection ms
The amount of time (in millisec ond s) for the c onnec tion
ATM NW Count
The numb er of setup  attemp ts on the ATM network
Setup ms
The amount of time (in millisec ond s) to set up  the c onnec tion.
Hour
The time of the d ata c ollec tion.
list measurements atm pnc-latency last-hour
Switch Name: _______________    Date: 7:23 pm  SAT MAR 21, 1998
                             
ATM PNC LATENCY MEASUREMENTS
            -----------A-PNC-----------            ---------B-PNC----------
Orig Dest PN Connection  ATM NW Setup  Hour    PN Connection  ATM NW Setup  Hour
PN   PN   Count     ms    Count   ms           Count     ms   Count    ms
1    5    2200     143    2055    153  1900
1    8    1219     78     1144    83   1900
5    8    2663     220    2386    245  1900
5    7    143      105    123     122  1900
4    2    7101     326    6845    338  1900
10   11   353      54     343     56   1900
10   12   3360     76     3326    77   1900
10   1    1570     71     1547    72   1900
1    10   1570     83     1547    84   1900
8    2    1100     62     1038    66   1900 
						

							DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration  555-233-124  Issue 1
April 2000
Troubleshooting 
6-44 Troubleshooting ATM-PNC 
6
ATM-PNC c onfig uration in whic h Inverse Multip lexing for ATM (IMA) is used  
g oing  into and  c oming  out of the network c loud . 
Figure 6-4. Bandwidth-constricted ATM network configuration
In this c onfig uration c onnec tions from the DEFINITY ECS switc h and the ATM 
b ac kb one switc h and  to the ATM ac c ess c onc entrator are OC-3/STM-1 throug h 
the TN2305/TN2306 ATM interfac e c irc uit p ac ks over fib er op tic  c ab le. When 
traffic  exc eed s the c ap ac ities of the IMA links, c ontention for ac c ess to the ATM Figure Notes
1 . D EFI N ITY EC S PPN
2 . D EFI N ITY EC S Ex p a n s io n  Po r t  N e t w o rk  (EPN )
3. OC-3/STM-1 c onnec tion
4. ATM switc h A
5. ATM switc h B6. DEFINITY ECS ac c ess terminal 
7. IMA c onnec tion
8. ATM network
9. Ac c ess c onc entrator
1 0 . D EFIN I TY EC S EPN
1
2
3
3
6
778
945
cydaband LJK 020100
10 
						

							DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration  555-233-124  Issue 1
April 2000
Troubleshooting 
6-45 Troubleshooting ATM-PNC 
6
network occurs. In such cases, SVC setups requested by DEFINITY can be 
d enied  b y the ATM network and  assoc iated  c omp onents, and  c alls are not 
completed.
In this sec tion, a failed  SVC setup  means that the ATM network has ac tively 
rejec ted  the req uest. A d elayed  SVC setup  means that the SVC setup  exc eed ed  
a time threshold , sp ecified  in milliseconds (ms).
Performanc e ind ic ators of b oth failed  and  d elayed  SVC setup s:
nThe c alled  p arty may hear ring ing , take the rec eiver off-hook, and  hear 
nothing . The c alled  p arty may eventually rec eive a d elayed  c all, b ut never 
rec eives a failed  c all.
nIf the c all was d elayed, the c alling  p arty hears silenc e if one of the SVCs is 
not up  or hears the c alled p arty if it is up .
nIf the c all is never c omp leted , the c aller eventually hang s up  without 
knowing  why the c all was not c omp leted .
Therefore, SVC failures that oc c ur more often than normal are most often 
evid enc e of an ATM network that is out of sp ec ific ation. 
The tools to manag e the DEFINITY ECS switc h and  the ATM network are
nAlarming out-of-spec conditions
nSVC latency commands
nAdministration threshold s to either allow or d eny c ompletion of c alls that 
req uire a new SVC over a p ath that rec ently exp erienc ed  a hig h numb er of 
delayed or failed SVCs.
Alarming out-of-spec conditions
Out-of-sp ec  c ond itions in the ATM network are reported  ag ainst the ATM-NTWK 
maintenanc e ob jec t in the Alarm Rep ort and  the Hard ware Error Rep ort (display 
errors
). Refer to one of the following  b ooks for an examp le of a Hard ware Error 
Rep ort with an ATM-NTWK alarm:
nDEFINITY Enterp rise Communic ations Server Release 8 Maintenanc e for 
R8 r
nDEFINITY Enterp rise Communic ations Server Release 8 Maintenanc e for 
R8 s i
nDEFINITY Enterp rise Communic ations Server Release 8 Maintenanc e for 
R8 c s i 
						

							DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration  555-233-124  Issue 1
April 2000
Troubleshooting 
6-46 Troubleshooting ATM-PNC 
6
SVC latency commands
Two rep orts are availab le to help  monitor the ATM network:
1. The ATM PNC Latenc y Histog ram rep ort (ac c essed  throug h the list 
measurements atm latency-histogram
 command) shows:
nSetup  c ount
nAd d Party c ount
ntotal
naverag e latenc ies
nhistog ram (21 d ifferent time b ins rang ing  from 0-9 msec . to + 10 
sec .)
Syn t a x : list measurements atm latency-histogram
 
current-hour | 
last-hour | today-total | yesterday-total [print or schedule]
Th e  list measurements atm latency-histogram
 outp ut is shown in Screen 6-18
.
Screen 6-18. ATM-PNC latency histogram report 
list measurements atm latency-histogram last-hour 
                                                                                                                                         
                                                          Page 1      SPE A
Switch Name:                                Date: 10:27 am TUE OCT 25, 1999
                           ATM PNC LATENCY HISTOGRAM
   Setup Count:  770      Average Latency (msec): 53        Failure Count: 3
AddParty Count:  538      Average Latency (msec): 92        Failure Count: 1
   Total Count: 1308      Average Latency (msec): 71        Failure Count: 4
    Range (msec) Setup AddParty Total   Range (sec) Setup AddParty Total
    0-9            0       0      0     1-1.9         1       0      1
    10-19        200       2    202     2-2.9         0       0      0
    20-49        400       3    403     3-3.9         0       0      0
    50-99        100       1    101     4-4.9         6       1      7
   100-149        50       6     56     5-5.9         0       0      0
   150-199        10       0     10     6-6.9         0       0      0
   200-249         3       0      3     7-7.9         0       0      0
   250-299         0       0      0     8-8.9         0       0      0
   300-399         0       0      0     9-9.9         0       0      0
   400-499         0       0      0      10 +         0       0      0
   500-999         0       0      0