DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Architecture
1-14Port Network Connectivity (PNC)
1
■ Two power units
Each power unit provides +5V to the circuit packs in its half of the SN and
to both SNCs.
■ Optionally in the PPN only, one Expansion Interface
■ Optionally, 1 or 2 DS1 converter (DS1C) circuit packs
The DS1 CONV circuit packs allow PNs to be located remotely up to 100
miles (161 km) between the two most distant PNs. The DS1 CONVs
provide DS1 facility transport for a subset of the fiber timeslots between
EIs in a direct connect system or between EIs and SNIs in CSS
configurations. They can also be located on port carriers.
■ TDM and PKT busses, and bus terminations
There are 16 data busses in the SN. Each SNI has a slot dependent data
bus on which it transmits data and has 16 inputs, one for each SN SNI slot,
including its own. The data busses are terminated by 4 AHF105 paddle
boards that mount on the backside of the backplane slots 2 and 20.
■ Power distribution and control leads
Figure 1-5
shows two examples of CSS configurations. Illustrations of the switch
node carrier hardware appear in Chapter 2.
