DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Hardware Configurations
2-7Carriers in Multi-Carrier Cabinets
2
Switch Node Carrier (J58890SA)
Switch Node carriers house the com ponents of a Center Stage Switch (CSS). The
first switch node is located in carrier E of the PPN. If duplicated in a Critical
Reliability configuration, its d uplicate is locate d in carrier D of the PPN. The
second switch nod e is located in c arrier E of a non-remoted EPN. If duplicated in
a Critical Reliability config uration, its duplicate is loc ated in carrier D of the same
EPN.
Table 2-4. Switch Node Carrier Circuit Pack Slots
Slot Name Circuit
Pack Code Notes
POWER UNIT
(right side) Power Unit
(+5V) 649A Required for DC-powered systems
EXPN INTFC
DS1 CONV/ 1 DS1
Converter TN574 Provides fiber connectivity from DS1 facilities
to a remote EPN; this slot used in conjunction
with an SNI in one of slots 2 to 9.
Expansion
Interface TN570 Used for an EI board only in the PPN cabin et
in a system with duplicated PNC (Critical
Reliability); used in conjunction with adjacent
SNI
2 to 9, 13 to 20 Switch
Node
Interface
TN573 SNIs are added sequentially as needed
beginni n g w ith slo t 2 . I f a s e co nd switch n ode
is needed, (for more than 16 EPNs), up to 5
SNIs (those in slots 7, 8, 9, 13 and 14) are
connected to corresponding SNIs in the other
SN.
SWITCH
NODE CLOCK
/ 10
Switch
Node Clock TN572 Required
SWITCH
NODE CLOCK
/ 12
Switch
Node Clock TN572 Used in Hig h Reliability option only
(duplicated SPE, simplex PNC)
DS1 CONV/ 21 DS1CONV TN574 Used as above in conjunction with an SNI in
one of slots 13 to 20
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