Lucent Technologies DEFINITY Enterprise Communications Server Release 8.2 System Description Manual

DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Site Requirements 
61 Cabinet Power Requirements 
Ground Isolation
Each peripheral connecting to a DEFINITY System, via the Asynchronous Electronic 
Industries Association (EIA) RS-232 interface, requires either a 105C, a 105D or a 116A 
Isolator Interface. The interface isolates ground between the system and external 
adjuncts.
The Isolator Interface is behind a PPN control carrier or behind an EPN...

Site Requirements 
62 Cabinet Power Requirements 
DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Figure 29 shows the DC-power distribution in some Multi-Carrier Cabinets with extended 
battery backup (large batteries). In R7r and later systems, the power distribution cables 
are on the right side of the cabinet only. This is because the 649A DC power converter 
circuit pack replaces 2 power converters at either end of each carrier. Switch node...

DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Site Requirements 
63 Cabinet Power Requirements 
Protective Grounds
Grounded Building Steel — The metal frame of the building where it is grounded by one 
of the following: acceptable metallic water pipe, concrete encased ground, or a ground 
ring. 
Acceptable Water Pipe — Underground water pipe, at least 1/2 inch 
(1.3 cm) in diameter, needs to be in direct contact with the earth for at least 10...

Site Requirements 
64 Cabinet Power Requirements 
DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Approved Floor Grounds
!WARNING:!
If the approved ground or approved floor ground can only be accessed inside a 
dedicated power equipment room, then connections to this ground should be 
made by a licensed electrician. 
Approved floor grounds are those grounds on each floor of a high-rise building suitable 
for connection to the ground terminal in...

DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Site Requirements 
65 Cabinet Power Requirements 
Single-Carrier Cabinet Power Systems
Each Single-Carrier Cabinet has 1 AC or 1 DC power supply that distributes DC-power 
and AC ringing voltage to the circuit pack slots in the cabinet.
AC Power Supply (1217A)
In an AC-powered cabinet, a single, plug-in, multi-output AC power supply is in the power 
supply slot. A power cord, with a 3-prong plug on...

Site Requirements 
66 Cabinet Power Requirements 
DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
DC Power Supply (676C)
In a DC-powered Single-Carrier Cabinet, a single, plug-in multi-output DC power supply 
is in the power supply slots.
The 676C DC power supply has a wide input voltage operating range of -42 to -60 VDC at 
up to 22A. The 676C produces the following outputs: +5.1 VDC at 0 to 55A, -5.1 VDC at 0 
to 5.5A, +12 VDC at 0 to 2A (surge...

DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Site Requirements 
67 Cabinet Power Requirements 
Compact Modular Cabinet (CMC)
AC Power Supply (650A)
In the Compact Modular Cabinet, a power cord, with a 3-prong plug on one end and an 
appliance connector on the other end, connects the supply to a dedicated AC power 
source. The power supply is a global power factor corrected AC/DC converter providing 
multiple DC outputs and AC ring outputs. It...

Site Requirements 
68 Cabinet Cooling Fans 
DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Cabinet Cooling Fans
Compact Modular Cabinet (CMC) Fan Unit
Two variable-speed fans are at the bottom of the cabinet. They receive +8 to +14 VDC 
from the power supply. An air filter, which can be removed and cleaned or replaced, is 
located above the fans. Air flows from the outside, into the bottom of the cabinet, around 
the circuit packs, and out...

DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Site Requirements 
69 System Protection 
Single-Carrier Cabinet Fan Unit
Four constant-speed fans at the top rear of the cabinet receive -48 VDC from the 
backplane. An air filter is located below the fan unit. Air flows down through the filter over 
the circuit packs. The filter is removable and is cleaned or replaced when necessary.
If the cabinet temperature reaches 158
o F (70o C), the...

Site Requirements 
70 System Protection 
DEFINITY Enterprise Communications Server Release 8.2
System Description  555-233-200  Issue 1
April 2000
Sneak Current Protection
Sneak current protection uses fuses to protect building wiring between the network 
interface and trunk circuits when exposed to extraneous power. The fuses also protect 
the circuit packs. 
All incoming and outgoing trunks and off-premises station lines pass through the sneak 
fuses. 507B Sneak fuse panels install on the system side...