User Guide

DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-851MAINT (EPN Maintenance Circuit Pack)
10
In Figure 10-62, PROCR means a TN790 for a RISC Processor circuit pack,
NETCON is the NEtwork Control circuit pack (TN777B) (the Active NETCON
circuit pack in a high or critical reliability system), and MB stands for the EPN
Maintenance circuit pack. Figure 10-62
shows the connectivity for a system with
duplicated Expansion Interface Links.
Figure 10-62. EPN Maintenance Circuit Pack Message Flow
The EPN Maintenance circuit pack must be physically inserted into the
dedicated slot marked Maintenance in the A carrier of the EPN. The serial links
from the EPN Maintenance circuit pack to the Expansion Links physically
connect from this dedicated slot to slots 2A01 and 2B02 (2B02 is used only if
there are redundant Expansion Links). The serial link from slot 2A01 to the
maintenance slot is hard-wired into the backplane of carrier A, whereas the serial
link from slot 2B02 to the maintenance slot is a ribbon cable connecting the two
slots. The serial link from the EPN Maintenance circuit pack to the terminal is also
a ribbon cable which plugs into a connector labeled TERM on the back of carrier
A.
The maintenance strategy for the EPN Maintenance circuit pack consists of
checking the integrity of the communications path to/from the EPN Maintenance
circuit pack, testing individual hardware components on the EPN Maintenance
circuit pack, and keeping the system level LEDs up-to-date. The individual
hardware components include the serial interfaces which handle the serial links
connected to the EPN Maintenance circuit pack. There are three serial
interfaces, one for each possible Expansion Interface circuit pack and one for the
Manager I (G1) or G3MT terminal.
P
R
O
C
R
N
E
T
C
O
N
TDM
BUS
FIBER
SERIAL LINK
PPN EPN
FIBER
SERIAL LINK
M
G
R
1
E
X
P
I
N
T
F
E
X
P
I
N
T
F
E
X
P
I
N
T
F
E
X
P
I
N
T
F
M
A
I
N
T