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DEFINITY Enterprise Communication Server Release 9
Installation and Maintenance for Survivable Remote EPN
555-233-121
Issue 2
November 2000
SREPN Maintenance
2-37
110 block cross-connect pins
2
110 block cross-connect pins
Table 2-12.
110 block cross-connect pins
SRP Aux
EPN Aux
Amphenol
Pin
Number
Color
Cross-
Connect
Pin
Number
Lead
Designation
a
a.
When the loop between Cust A (alarm) and Cust Rtn (return) closes, the SRSwitch configures the SRP into
Restore mode, overriding the faceplate switch setting. Closure of the customer alarm relay is controlled by
an SRP SAT command which closes the customer alarm relay on the SRP processor.
Pwr Fail (-48V) is grounded when the TN2301 detects that its -48V redundant power is bad.
Cust A (alarm) - see above.
SRPresent is always grounded, indicating to the TN775C (Maint.) that it is connected in a SREPN.
SRActive is generated by TN775C (Maint.) to disconnect links from Release 9r to SRP in Survive mode.
-48V In/Rtn is input and return used by DC/DC converter for supplying redundant power to the optical
transceivers.
SR Cntrl/Rtn, when active, connects to the SR Cntrl Rtn signal on the TN775C (Maint.). Loop closed -
TN2301 goes into Survive mode; loop open - TN2301 cannot come out of Survive mode without manual or
remote reset.
Cross-
Connect
Pin
Number
Color
Amphenol
Pin
Number
23
G-V
46
Cust Rtn
3
W-O
27
SRP Aux
SRP Switch
Amphenol
Pin
Number
Color
Cross-
Connect
Pin
Number
Lead
Designation
Cross-
Connect
Pin
Number
Color
Amphenol
Pin
Number
27
W-O
3
Pwr Fail (-48V)
46
G-V
23
48
V-G
45
Cust A
23
BK-O
37
EPN Aux
SRP Switch
Amphenol
Pin
Number
Color
Cross-
Connect
Pin
Number
Lead
Designation
Cross-
Connect
Pin
Number
Color
Amphenol
Pin
Number
02
O-W
4
Cust Rtn
24
O-BK
12
28
W-G
5
SRPresent
47
V-BR
49
29
W-BR
7
SRActive
48
BR-V
24
46
V-BL
41
-48V Rtn
41
V-BL
46
21
BL-V
42
-48V In
42
BL-V
21
48
V-G
45
b
b.
Momentarily short these two leads on the EPN Aux to verify the detection circuit on the TN2301 and the
Maintenance (TN775C) circuit pack wiring.
SR Cntrl
43
V-O
47
23
G-V
46
b
SR Cntrl Rtn
44
O-V
22