System organization 1-23
.’
System capacities
-
Network terminating capacity
The Superloop Network Card (NT8DO4AA) has four network loops
grouped as one superloop. One superloop can serve up to, two Intelligent
Peripheral Equipment
UEMs
(IPE)
(NT8D37AA/DC).
Network traffic capacity
Each superloop is capable of carrying 3500 CCS (or 875 CCS/Ioop) of
combined station, trunk, attendant console and
Digitone
traffic during
Average Busy Season Busy Hour (ABSBH) subject to the following grades
of service:
-
the loss of no more than 1% of the incoming terminating calls, provided
the called line is free
-
the loss of no more than 1% of the originating outgoing calls in the
system, provided an idle trunk is available
.
-
the loss of no more than 4% of the intra-office calls, provided that the
called line is free
-
no more than 1.5% of the originating calls wait longer than 3 seconds
for dial tone
-
the loss of no more than 1% of tandem calls, provided an idle outgoing
trunk is available
Memory capacity
The memory capacity is a function of the machine type. Memory
requirements are a function of the system size and features available. See
Table l-10 for the memory capacities of each system:
Table l-10
Memory capacity per system
System Memory
Option 21 768K words
Mbytes
1.5
1
Options 51 and 61 1 768K words
1
2.3
I
Option 71
1
1.5M
words
1
4.5
I
System engineering 553-3001-l 51