Lucent Technologies DEFINITY Enterprise Communications Server Release 8.2 Installation And Maintenance For Survivable Remote EPN Manual

							DEFINITY® Enterprise Communications Server Release 7 Installation and 
Maintenance for Survivable Remote EPN  555-233-102  Issue 2
June 1999
SREPN Maintenance 
2-5 SREPN connections 
2
Expansion Interface connections
nTN570C Exp ansion Interfac e (EI) c irc uit p ac ks use either the 9823A 
(multimod e) or the 300A (sing le mod e) transc eivers.
NOTE:
A new SREPN system inc lud es the TN570C EI c irc uit p ac k. Earlier EI 
c irc uit pac ks (for examp le, TN570B) are not sup p orted .
DS1 CONV connections
nTN1654 DS1 Converter sup p orts T1/E1 remoting  and  wid eband  
applications.
nStand ard  and  Hig h Reliab ility systems use p airs of TN1654, not mixed  with 
the earlier TN574.
nCritic al Reliab ility systems req uire TN1654 c irc uit p ac ks on the d up lic ate 
pair. 
						

							DEFINITY® Enterprise Communications Server Release 7 Installation and 
Maintenance for Survivable Remote EPN  555-233-102  Issue 2
June 1999
SREPN Maintenance 
2-6 SREPN connections 
2
Transfer sequence to Survive mode
Transfer from Normal to Survive mode is automatic  and  is c ontrolled  b y the 
TN775C Maintenanc e b oard . Fi g u re  2 - 3
 shows a schematic of the link switc hing  
within the TN2301 c irc uit p ac k.
Figure 2-3. TN2301 link switching schematic
The transfer seq uenc e to Survive mod e is:
1. Links from the Release 7r PPN to one of its c onfig ured  SREPNs fail.
2. The TN775C Maintenanc e c irc uit p ac k (A-c arrier SREPN) d etec ts the link 
failure and  sig nals the TN2301 to d isc onnec t its links to the Release 7r and  
c onnec t the SREPN Exp ansion Interfac e.
3. The TN790B Survivab le Remote p roc essor (SRP) takes over c ontrol of the 
EPN in Survive mod e on Link A. Link B is left op en while the SRP is in 
c ontrol of the SREPN.
NOTE:
In Survive mod e, the SRSwitc h (TN2301) p uts the EI/SNI c irc uit p ac k in the 
Release 7r into loop b ac k mod e. Figure Notes:
1. Release 7r
2. Survivable Remote EPN (SREPN)3. SRSwitc h (TN2301)
4. Survivab le Remote p roc essor (R7si)
cydfsrp2 KLC 022499
AA
BBTN2301
1
3
4
AB
2 
						

							DEFINITY® Enterprise Communications Server Release 7 Installation and 
Maintenance for Survivable Remote EPN  555-233-102  Issue 2
June 1999
SREPN Maintenance 
2-7 SREPN connections 
2
Tab le 2-3 shows the sequenc e of events to transfer to the Survive mod e, the 
ap p roximate times for eac h event, and  the servic e affec ted  at eac h stag e.
TN2301 (SRSwitch)
The SRSwitc h c irc uit p ac k (TN2301) oc c up ies 6 slots in the SRP c ab inet. Fi g u re  
2-4 shows the fac ep late switc h and  LEDs for the TN2301 c irc uit p ac k.
Table 2-3. Transfer sequence to Survivable Remote mode
If the link between 
the Release 7r and an 
EPN is down for  Then Service affected
1 minute Emerg enc y Transfer Mod e activated .
Only established  c alls 
p reserved.
1
1. Similar to Emerg enc y Transfer mod e, only established , intra-EPN calls are preserved . No new or 
originating calls can be made. 2-3 minutesSystem “ waits”  to d etermine whether the 
Release 7r is g oing  throug h a reset 3. 
3 minutes Survive mod e activated  for eac h SREPN.
2
2. Transfer to Survive mod e inc lud es a cold  restart of the SREPN.Estab lished c alls 
terminated  (restart)
5-6 minutes Transfer seq uenc e c omp leted ; EPN servic e 
restored.Intra-EPN c alls p ossib le
3
3. Calls using  the link b ac k to the Release 7r are not p ossib le. 
						

							DEFINITY® Enterprise Communications Server Release 7 Installation and 
Maintenance for Survivable Remote EPN  555-233-102  Issue 2
June 1999
SREPN Maintenance 
2-8 SREPN connections 
2
Figure 2-4. TN2301 faceplate switch and LEDs
Faceplate switch
Tab le 2-4 ind ic ates the 3 p ositions for the fac ep late switc h and  the use for eac h.
Table 2-4. Faceplate switch positions and uses
Label Position Use
RSTR Top Forc es c ontrol to the Release 7r b y switc hing  from Survive mod e 
to Normal mod e
1
1. This switc h p osition overrid es the restore survivable-remote-link command  from the SAT 
terminal. See ‘‘Restore from remote location’’ later in this chapter for more information.
AUTO Mid dle Ready to g o into Survive mod e. The switc h should  be in this 
p osition excep t d uring  installation, testing , or releasing the SRP 
from Survive mod e.
TEST Bottom Forc es control to the SRP (Survive mode). Links to the SREPN are 
throug h the SRP (TN790B Proc essor).
1
!CAUTION:
This is for installation and testing  only. Do not leave the 
switc h in this p osition.
ckdf02fo RPY 022398
BKUP
DATA
AUTO
RSTR
AUTO
TEST
SURVIVE
MODE ON 
						

							DEFINITY® Enterprise Communications Server Release 7 Installation and 
Maintenance for Survivable Remote EPN  555-233-102  Issue 2
June 1999
SREPN Maintenance 
2-9 SREPN connections 
2
SREPN connections
Fi g u re  2 - 5 shows a d etailed view of the rear p anel c onnec tors.
Figure 2-5. SREPN rear panel - detail
scdfsre4 RPY 022398
PI EI
TX S.R.
SW ITCHEPN B EPN APPN B PPN A
TX TX TX
RX RX RX RXAUX
DCE TERM 
						

							DEFINITY® Enterprise Communications Server Release 7 Installation and 
Maintenance for Survivable Remote EPN  555-233-102  Issue 2
June 1999
SREPN Maintenance 
2-10 SREPN connections 
2
Fi g u re  2 - 6 shows the hard ware c onnec tions in the d irec t fib er system.
Figure 2-6. Detailed SRP direct fiber connections Figure Notes:
1. Fib er transmit (TX) and rec eive (RX) 
p airs for A and  B c arriers.
2. SRP AUX B25A 25-p air c ab le; max. 
leng th =  50 ft. (15.25 m):
nMajor SRP p ower failure alarm lead
nRemote restore sig nal lead s
3. TN2301 - SRSwitc h B25A 25-p air 
cable; max. length =  50’  (15.25 m):
n-48V from SREPN (through wall 
field)
nSRSwitc h -48V major SRP p ower 
failure alarm lead
nSRSwitc h -48V sig nal lead s4. SREPN AUX c onnec tor B25A 25-p air c ab le; max. 
leng th =  50 ft. (15.25 m). Refer to the ‘‘
MDF 
c onnec tions’’ in Chap ter 1:
n-48V to SRSwitc h (throug h wall field )
nSRP A la r m
nSRSwitc h sig nal lead s
5. Fib er transc eivers (9823A)
6. 14-inc h (35.5 c m) Y-Cab le (Comc od e 847245750)
7. Fib er op tic  c able pairs
8. Release 7r switc h
cydfsrpn KLC 011199
A
B
E
I
E
IT
N
7
7
5
CB-carrier
A-carrier
AUX
System
Access
Terminal
E
I
E
I
SRPSREPN cabinets
5
52
Collocated equipment
1
2
3
48
S.R.
switchA B
5
5
7
6
EI
AUXTransmit (TX)
and receive (RX)
fiber pair
Wall field
LGIU 
						

							DEFINITY® Enterprise Communications Server Release 7 Installation and 
Maintenance for Survivable Remote EPN  555-233-102  Issue 2
June 1999
SREPN Maintenance 
2-11 SREPN connections 
2
Fi g u re  2 - 7 shows the hard ware c onnec tions in the DS1-CONV system.
Figure 2-7. Detailed SRP DS1-CONV connections  Figure Notes:
1. Fib er transmit (TX) and rec eive (RX) 
p airs for A and  B c arriers.
2. SRP AUX B25A 25-p air c ab le; max. 
leng th =  50 ft. (15.25m):
nMajor SRP p ower failure alarm lead
nRemote restore sig nal lead s
3. TN2301 - SRSwitc h B25A 25-p air 
c ab le; max. length =  50 ft. (15.25m):
n-48V from SREPN throug h wall field
nSRSwitc h -48V power failure alarm 
lead
nSRSwitc h sig nal lead s4. SREPN AUX c onnec tor B25A 25-p air c ab le; max. 
leng th =  50 ft. (15.25m). Refer to the ‘‘
MDF connections’’ in Chapter 1:
n-48V to SRSwitc h throug h wall field
nSRP A la r m
nSRSwitc h sig nal lead s
5. TN1654 (DS1C) c an b e used only in c ombination 
with another TN1654.
6. Fib er transc eivers (9823A - multimod e)
7. 14-inc h (35.5 c m) Y-Cab le (Comc od e 848101440)
8. Fib er op tic  c able pairs
9. Release 7r switc h
cydfsrn2 KLC 011199
A A
B B
D
S
1
CE
I
D
S
1
CE
IT
N
7
7
5
CB-carrier
A-carrier
CSU CSU
Wall field
System
Access
Terminal
D
S
1
CS
N
I
S
N
I D
S
1
C
SRPSREPN cabinets
DS1
5
52
Collocated equipment
AUX
S.R.
switch
EI AUX
9
1
2
3
4
5
5
5
66
6
6
7
8
8
Transmit (TX)
and receive (RX)
fiber pair 
						

							DEFINITY® Enterprise Communications Server Release 7 Installation and 
Maintenance for Survivable Remote EPN  555-233-102  Issue 2
June 1999
SREPN Maintenance 
2-12 Maintenance procedure 
2
Maintenance procedure
Sinc e Survive mod e is invoked  bec ause of a link failure b etween the Release 7r 
and  an EPN, the maintenanc e strateg y is to:
1.‘‘
Check system status’’
2.‘‘Rep air the link c onnec tion’’
3.‘‘Rec onnec t the Release 7r to the EPN’’
4.‘‘Post-reset check’’
The final sec tions of this c hap ter p rovid e information for resolving
n‘‘Power alarms’’
n‘‘System resets’’
Check system status
Beg in the troub leshooting  p roc ess b y g athering  information ab out the system 
c omp onents.
n‘‘Circ uit pac k LEDs’’
n‘‘Whic h EPN is survivab le?’’
n‘‘EI interac tions’’
n‘‘Testing  the TN2301 func tion and  wiring’’
n‘‘Health of Port Network Connec tions (PNC)’’
n‘‘Ad ministered  links’’
Circuit pack LEDs
SRSwitch (TN2301) LED interpretation
Tab le 2-5 lists the c ond itions ind ic ated  b y the LEDs on the TN2301 c irc uit p ac k.
Table 2-5. TN2301 LED interpretation 
LED (color) Condition Interpretation
BKUP - Backup  p ower 
(red )On stead y Backup  p ower (-48v) from the SREPN to the TN2301 
has failed .
DATA (yellow) On stead y Data p assing throug h the TN2301 to/from the A-c arrier 
EI  b o a r d  i n t h e EPN .
Continued on next page 
						

							DEFINITY® Enterprise Communications Server Release 7 Installation and 
Maintenance for Survivable Remote EPN  555-233-102  Issue 2
June 1999
SREPN Maintenance 
2-13 Maintenance procedure 
2
Expansion Interface (TN570C) LED interpretation
The Exp ansion Interfac e c irc uit p ac k has red , g reen, and  yellow LEDs. The red  
and  g reen LEDs show the stand ard  c ond itions:
nRed  ind ic ates an alarm c ond ition
nGreen ind ic ates maintenanc e testing  in p rog ress
The yellow LED is used  to p rovid e useful visual status information:
nAc tive EI c irc uit p ac ks:
— Have their yellow LED on solid  (for an inter-EPN EI in a 
d irec t-c onnec t system)
— Blink a p attern of 2 sec ond s on and  200 ms off.
nThe stand b y PNC EI c irc uit p ac ks should  have their yellow LEDs off.
NOTE:
Another way to d etermine whic h PNC (and  therefore, whic h EI in a p ort 
network) is ac tive and  whic h is stand b y, use the status port-network
 and 
status PNC
 commands.
See Tab le 2-6
 for the p ossib le EI yellow LED states.
Off If off and  no servic e-affec ting  c ond itions are p resent, 
Critic al Reliab ility B-c arrier links to the Release 7r are 
up .
AUTO (g reen) On stead y Indic ates that the TN2301 fac eplate switc h is in the 
AUTO p osition. This is normal when in-service.
SU RVI VE M OD E ON  
(red )On stead y Survive mode ac tivated  either b y the Maintenanc e 
c irc uit p ack c ontrol or the facep late switch is in the TEST 
position.
Table 2-5. TN2301 LED interpretation  — Continued
LED (color) Condition Interpretation
Continued on next page 
						

							DEFINITY® Enterprise Communications Server Release 7 Installation and 
Maintenance for Survivable Remote EPN  555-233-102  Issue 2
June 1999
SREPN Maintenance 
2-14 Maintenance procedure 
2
Table 2-6. Expansion Interface circuit pack 
Yellow LED Flashing States 
Condition LED On LED Off
Fib er Out-of-Frame
1
1. This flashing  state c orresp onds to Error Codes 769 and  770 from the 
Hard ware Error Log and ind icates a failure of Test #238. These error cod es 
are usually ac c ompanied  by Error Cod e 1281 (no Exp ansion Interfac e or 
Switc h Nod e Interface detected on op p osite end  of fib er). This condition may 
b e c aused  by the ab sence of the neig hb or Exp ansion Interfac e or Switc h 
Nod e Interface circuit p ac k, a b roken or missing  fiber, or a missing  lig htwave 
transc eiver on either end p oint (Exp ansion Interfac e or Switch Nod e Interface 
c irc uit p ac ks).
When the SRP is in Survive mode, this flash rate at the Release 7r EI/SNI 
circ uit pac k is normal, b ecause the TN2301 puts the fib er into loop around  
b ac k to the Release 7r.
0.1 second 0.1 sec ond
In Frame-No Neig hb or
2
2. This c orresp ond s to Error Cod e 1281 from the Hard ware Error Log  and  
ind ic ates a failure of Test #237. This condition is usually d ue to the failure of 
this Expansion Interface c irc uit p ack or a failed  Exp ansion Interfac e or Switc h 
Nod e Interfac e c irc uit p ac k c ounterp art.
When the SRP is in Normal mode, the Expansion Interfac e c ircuit p ack’s 
yellow LED flashes at this rate. THIS IS NORMAL. The links to its c ounterp art 
in the R7r ARE down and  are not re-established  until the SRP g oes into 
Sur v iv e m od e .
0.5 second 0.5 sec ond
Exp ansion Interface Active
3
3. This is the normal state for an Ac tive EPN Expansion Interfac e c ircuit p ac k 
that is also the bus master (Exp ansion Arc hang el) in the EPN.2 sec ond s 0.2 sec ond
Exp ansion Interface Active
4
4. This is the normal state for an Ac tive Exp ansion Interface circuit p ack that is 
not the bus master (Exp ansion Arc hang el) for an EPN. This ap p lies only in 
d irect-c onnec t config urations where the Exp ansion Interface circuit p ack in 
an EPN is c onnec ted throug h a fib er link to an Exp ansion Interfac e circuit 
p ac k in the other EPN. This state also ap p lies for an active Exp ansion 
Interfac e c irc uit p ac k located  in the PPN.Solid  on Never off
Exp ansion Interface Standb y
5
5. This is the normal state for a stand b y Expansion Interface c ircuit p ac k in the 
PPN  a nd  EPN .
Never on Solid off
Continued on next page