user manual

ND-20292
CHAPTER 2
APRIL, 1990
220.7 ELECTRICAL NOISE GENERATORS
Equipment such as welding machines, thyristor-driven
power supplies, electric motors, etc., generate electrical
noise. As a stored program unit, the Electra Mark11
System is vulnerable to this noise. When this type of
machinery is present at an installation, the following
precautionary steps are urged:
1. Locate the CCUs terminal equipment and cabling
away from these machines.
2. If cables must pass near these machines, use
shielded cable with the shield grounded.
3. Ensure all machines of this type are well
grounded to a separate ground to minimize
noise interference.
220.8
ADDITIONAL EQUIPMENT
In addition to electronic station equipment (CCUs and
their components) other equipment is required. These
are cables, modular connecting jacks, quick-connect
blocks, etc. This additional equipment must be locally
supplied.
220.9 SYSTEM CAPACITY
1.
Electra Mark11 capacities are as follows:
System ports:
Outside lines:
Intercom paths
(Multiline Terminals):
128 ports max.
40 lines max.
Non blocking
;:
C.
d. Terminals:
e. DSS/BLF Consoles:
80 sets max.
6 units max; of which a
max. of 4 units can be
CO Add-On Modules.
80 buffers (16 digits
each).
20 buffers each station
(16 digits each) (110
buffers for
each
ETE-16K-1).
4 max.
4 modems max.
40 lines max.
f.
Is
System Speed Dial:
Station Speed Dial:
h.
i.
j.
Conference circuits:
Modem Pool:
E & M Tie Lines:
NOTE: These figures represent the maximum of
individual type devices. Since the system
capacity is defined by the 128 ports, some
devices may not be installed up to the
maximum numbers, depending upon the
system configuration.
Multiline Terminal,
DSSlBLFs, RN&E
DID,Tie LineSo-
I-
.
J+i
.
e
CO Add-On Modules, 1
Multiline Terminals
SLTs, Modems 1
] N%
I_
H ‘NE\%E
. . . . . . . . . . . . . . , . . . . . . . . . . . . . . .
; E&,S i-j ‘NFktsCE ;
. . . . . . . . . . . . . . I . . . . . . . . . . . . . . . a
l-
,-----m-q
& PSE-/g&DO-l ;
1 ---e-w- J
L.-.-.-,-.-
# PSEAYDD-1 i
b._ .-.-. _.d
+pq
,.*.*...........*
+; PSE-fStDD-1 i
I . . . . . . . . . . . . . ..I
COlPBX Lines, Modems 0
Night Chime De
NOTE 1: :;I;: installed in basic CCU
Installed in first expansion CCU
Installed in second expansion CCU
Installed in third expansion CCU
l-.-.-l
L.-.A
IRI
. . . ...*..
. . . . . . . . .
ti
External Tone Ring
BGM Sources or Dela
Announcer Unit
-‘I I
Voice Mail/Dictation 1-k
EquipmeWSLT, Auto
Attendant, Modems
I
Installed in any CCU
.
‘.
NOTE 2: interface cards are as follows:
.-,
ESI. SLI, COI, MFR. CNF, ECR.VMI, TLI
Figure 200-4
System Block 1
200-6
Diagram