DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-785EXP-INTF (Expansion Interface Circuit Pack)
9
Figure 9-40. Center Stage Switch Configuration with Duplicated PNC
In a duplicated center stage switch configuration, two EIs are needed in each
port network. One is located on the A-side PNC and the second one is located on
the B-side PNC. Note that PNC designation (A or B) does not relate directly to
carrier location. The EI that is on the active PNC is the one that is acting as the
Archangel (TDM Bus Master) for the EPN. This is the EI that should have its
yellow led blinking at a rate of 2 seconds on and 200 ms. off. The standby PNC EI
should have its yellow led off. The PPN EI circuit packs are located in the first slot
of the switch node carriers, although they may be located in port carriers.
An EPN (and thus, the EIs contained in that EPN) can be remoted via a DS1
converter complex. This requires that the associated fiber link which provides
connectivity to the remoted EPN, be administered with a DS1 converter complex.
The DS1 converter complex consists of two TN574 DS1 converter (DS1 CONV)
circuit packs connected by from 1 to 4 DS1 facilities. Figure 9-41
shows where
the DS1 converter complex fits into an EI to SNI, or EI to EI fiber link. For more
information, refer to the DS1 CONV circuit pack Maintenance documentation.
FIBER
FIBER
A-PNC
FIBER
FIBER FIBER
21
21
10
1 1
1 2 10
13
13 1 2 10 12
N N
N
N N N
N
I I I I I
I
I
I
I I
C C
C C
CARRIER D
SN #1
SN #1
CAB 1
CAB 1
CARRIER D
Slot #
Slot #
EPN EPN
CAB 2
CAB 2
CARRIER B
CARRIER B
CARRIER A CARRIER A
CAB 3
CAB 3
Slot #
Slot #
SN #2
SN #2
CAB 2
CAB 2
CARRIER E
CARRIER E
E
E
E
E
E
E
I
I I
I I
I
S S S S S S S
S S
S
S S S
S
N N N N N N N
1
2
2
2 10
13
13 2 1
20
20
B-PNC
METALLIC
METALLIC
CABLE
CABLE
FIBER
