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DEFINITY Enterprise Communication Server Release 9
Installation and Maintenance for Survivable Remote EPN 555-233-121
2
SREPN Maintenance
110 block cross-connect pins
110 block cross-connect pins
Table 2-12. 110 block cross-connect pins
SRP Aux
Amphenol
Pin
Number
Color
23
G-V
SRP Aux
Amphenol
Pin
Number
Color
27
W-O
48
V-G
EPN Aux
Amphenol
Pin
Number
Color
02
O-W
28
W-G
29
W-BR
46
V-BL
21
BL-V
48
V-G
23
G-V
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.
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.
Cross-
Connect
Pin
Lead
Number
Designation
46
Cust Rtn
Cross-
Connect
Pin
Lead
Number
Designation
3
Pwr Fail (-48V)
45
Cust A
Cross-
Connect
Pin
Lead
Number
Designation
4
Cust Rtn
5
SRPresent
7
SRActive
41
-48V Rtn
42
-48V In
b
45
SR Cntrl
b
46
SR Cntrl Rtn
EPN Aux
Cross-
Connect
Pin
a
Number
Color
3
W-O
SRP Switch
Cross-
Connect
Pin
Number
Color
46
G-V
23
BK-O
SRP Switch
Cross-
Connect
Pin
Number
Color
24
O-BK
47
V-BR
48
BR-V
41
V-BL
42
BL-V
43
V-O
44
O-V
Issue 2
November 2000
2-37
Amphenol
Pin
Number
27
Amphenol
Pin
Number
23
37
Amphenol
Pin
Number
12
49
24
46
21
47
22
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