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 expansion control 
carrier. The 105C, 105D, or the 116A installs at the RS-232 interface between the 
peripheral equipment and the interface connector. 
Figure 28 shows the power distribution in some Multi-Carrier Cabinets with short term 
battery holdover (small battery). In R7r and later systems, the power distribution cables 
are on the right hand 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 (SN) carriers require two 649As and 2 cables. 
Figure 28. Power Distribution in Multicarrier Cabinets
41
Fan unit
Power
distribution
unit Port carrier
Control
carrier 649A DC
power converter
circuit pack
Port or switch
node carrier
Port or switch
node carrier
649A DC power
converter circuit pack
Port or
control carrier
lcdfpdu1 LJK 071497
Small battery
(Inside cabinet) 
						

							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 (SN) 
carriers require two 649As and two cables. 
Figure 29. DC Power Distribution in Multicarrier Cabinets
DC Power Converter (649A)
The 649A converts the –48 VDC from the Power Distribution Unit to outputs of –48 VDC 
at 10 A, +5 VDC at 60 A, and –5 VDC at 6 A. These outputs distribute power to circuit 
pack slots in the carriers. 
AC and DC Grounding
Approved Grounds
An approved ground is the closest acceptable medium for grounding the building 
entrance protector, the entrance cable shield, or single-point ground of the system.
If more than one type of approved ground is available on the premises, bond the grounds 
together as specified in Section 250-81 of the National Electrical Code, or the applicable 
electrical code in the country where the equipment is installed.
Power
distribution
unit649A DC
power converter
circuit pack
649A DC power
converter
circuit pack
Control
carrierLarge battery
cabinets
Circuit
breaker
Switch node
carrier
lcdfpdu2 LJK 110797 
						

							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 feet (3 
meters). The pipe must be electrically continuous (or made electrically continuous by 
bonding around insulated joints, plastic pipe, or plastic water meters), to the point where 
the protector ground wire is connected. 
A metallic underground water pipe must be supplemented by the metal frame of the 
building, a concrete encased ground, or a ground ring.
If these grounds are not available, the water pipe ground can be supplemented by one of 
the following types of grounds: 
nOther local metal underground systems or structures — Local underground 
structures such as tanks and piping systems
nRod and pipe electrodes — A 5/8 inch (1.6 cm) solid rod or 3/4 inch (1.9 cm) 
conduit or pipe electrode driven to a minimum depth of 8 feet (2.5 meters)
nPlate electrodes — Must have a minimum of 2 square feet (0.18 square meters) of 
metallic surface exposed to the exterior soil
Concrete Encased Ground — An electrode encased by at least 2 in. (5 cm) of concrete 
and located within and near the bottom of a concrete foundation or footing in direct 
contact with the earth. The electrode must be at least 20 feet (6 meters) of one or more 
steel reinforcing bars or rods 1/2 inch (1.3 cm) in diameter, or at least 20 feet (6 meters) 
of bare, solid copper, 4 AWG (26 mm
2) wire.
Ground Ring — A buried ground that encircles a building or structure at a depth of at 
least 2.5 feet (0.8 meter) below the earths surface. The ground ring must be at least 20 
feet (6 meters) of 2AWG (35 mm
2), bare, copper wire. 
						

							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 the riser closet and to the cabinet equipment 
single-point ground terminal. Approved floor grounds may include the following: 
nBuilding steel
nThe grounding conductor for the secondary side of the power transformer feeding 
the floor 
nMetallic water pipes
nPower feed metallic conduit supplying panel boards on the floor 
nA point specifically provided in the building design for grounding 
NOTE:
Electrically connect all protective grounds together to form a single grounding 
electrode system.
Coupled Bonding Conductor
When using Coupled Bonding Conductor (CBC) grounding in an AC- powered cabinet, 
maintain a minimum 1 ft. (0.3 m) spacing between the CBC and other power and ground 
leads. 
In AC-powered systems, locate the system single-point ground terminal block on the AC 
load or AC protector cabinet. 
						

							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 one end and an appliance connector on 
the other end, connects the supply to a dedicated AC power source. 
The 1217A is a global power unit for Single-Carrier Cabinets. It has a wide input voltage 
operating range of 90 to 264 VAC and a 50/60 Hz autoranging input, multi-output power 
supply that provides regulated DC output. The 1217A also has a selectable 20/25 Hz AC 
ringer.
The inputs to the power supply can be (depending on list version):
n120 VAC, 60-Hz, 15-Amp to 20-Amp; 3 wires in the power cord: 1 hot wire, 1 
neutral wire, and 1 ground wire
n220 VAC or 240 VAC, 50-Hz, 10-Amp; 3 wires in the power cord: 1 hot wire, 1 
neutral wire, and 1 ground wire
The AC power supply produces the following DC outputs: +5 VDC, –5 VDC, –48 VDC, 
+12 VDC, and a battery-charging voltage. The DC outputs distribute power on the cabinet 
backplane to the circuit pack slots. Additionally, the -48 VDC output current capacity has 
been increased from 6.85 amps to 8.25 amps. A 50 amp load inrush requirement has 
been added to the -48 VDC output
A holdover circuit in the power supply allows a system to operate normally during AC 
power interruptions. If AC input power fails, reserve batteries supply power to the memory 
and processor circuit packs and fans for 2 minutes. All port circuit packs are inactive 
during this time. The power supply contains a battery charger to charge the holdover 
batteries. 
						

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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 to 2.8A for 350 ms), -48 VDC at 0 to 8.25A. The 
outputs distribute power on the cabinet backplane to the slots for the circuit packs. The 
AC ringing voltage output value and frequency depend on the country of use. The power 
supply has circuit breakers and EMI filtering.
DC Power Distribution Unit (J58890CG)
The J58890CG is used with Single-Carrier Cabinets. Individual DC output connectors can 
power up to 4 Single-Carrier Cabinets. Each output connector is separately fused at 25 A 
(fuses are inside the unit). The input to the DC distribution unit is from the DC power 
cabinet.
The J58890CG is required when the distance between the DC power cabinet and the 
cabinet stack is greater than 30 feet (9 m).
Enhanced DC Rectifier Cabinet (J58890R)
The J58890R is used with Single-Carrier Cabinets. Each rectifier assembly in the DC 
rectifier cabinet can supply up to 50 A of DC current. A minimum of two rectifiers install in 
each DC cabinet to supply a total of 100 A. A third rectifier assembly is used as a backup 
only. 
Each Single-Carrier Cabinet can draw up to 15 A. Up to 3 DC cabinets can be stacked to 
supply power to single-carrier cabinets stacks. 
Each output connector is separately fused at 25 A (fuses are inside each DC rectifier 
assembly).
NOTE:
A J58890CG DC Power Distribution Unit is required if the distance between the 
DC cabinet and the cabinet stack is greater than 30 feet (9 m).  
						

							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 is auto ranging 85 to 264 VAC, 47 to 63 Hz, at 
330 Watts, 4.5 A (100-120 VAC) or 2.3 A (200-240 VAC) at 500 VA.
The inputs to the power supply can be (depending on list version): 
n120 VAC, 50-Hz to 60-Hz, 6-Amp; 3 wires in the power cord: 1 hot wire, 1 neutral 
wire, and 1 ground wire
n220 VAC or 240 VAC, 50-Hz to 60-Hz, 3-Amp; 3 wires in the power cord: 1 hot wire, 
1 neutral wire, and 1 ground wire
The AC power supply produces the following outputs: +5 VDC, –5 VDC, and –48 VDC. 
The outputs distribute power on the cabinet backplane to the circuit pack slots. The AC 
ringing voltage output value and frequency depend on the country of use. The 650A also 
supplies power for neon message-waiting lamps (150 VDC). The power supply has EMI 
filtering.
Compact Modular Cabinet (CMC)
Uninterruptible Power Supply (UPS)
The UPS provides surge protection for all connected cabinets.
1. Connect the UPS to an electrical outlet capable of handling the power 
requirements of all cabinets. To calculate the number of amps drawn, use the 
following formulas. 
a. 100-200 VAC, multiply 3.5 amps times the number of cabinets.
b. 200-240 VAC, multiply 1.8 amps times the number of cabinets.
2. Cabinet A (control carrier) is always connected to an 
unswitched or always on 
electrical outlet on the UPS. 
						

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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 through the top of the cabinet.
If the cabinet temperature reaches 158
o F (70o C), the temperature sensor in the power 
supply shuts the system down and invokes the emergency transfer.
Multi-Carrier Cabinet Fans
A fan unit consisting of 6 fans, mounts near the center of the cabinet. The 3 front fans 
blow up and the 3 rear fans blow down. A removable air filter is provided above and 
below each fan unit. Four sensors monitor the cabinet temperature; 3 sensors are inside 
the cabinet top and 1 sensor is inside the cabinet bottom. One of the top sensors affects 
the speed of the front fans and the bottom sensor affects the speed of the rear fans. A 
speed control and thermal alarm circuit in each fan monitors the sensors. When a sensor 
indicates a change in cabinet temperature, the circuit in a fan changes that fan’s speed 
accordingly. 
A power cable from the Power Distribution Unit connects -48 VDC to each fan, +5 VDC to 
the speed control and thermal alarm circuit in each fan, and temperature sensor signals 
to the equivalent circuit in each fan. One pair of wires routes to each fan circuit. Alarm 
signals also route to the equivalent circuit in each fan. One pair of wires routes to each 
fan circuit. 
A minor alarm is sent to the processor circuit pack in the PPN cabinet and the 
maintenance circuit pack in an EPN cabinet if any fan’s speed drops below minimum. A 
minor alarm occurs if a fan has stopped due to loss of -48 VDC. A major alarm is sent by 
one of the cabinet top thermal sensors if the exhaust temperature reaches 149 
oF (65oC). 
Another cabinet top sensor senses if the exhaust temperature reaches 158 
oF (70 oC). If 
so, the system shuts down and the Emergency Transfer is invoked.  
						

							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 temperature sensor in the power 
supply causes the system to shut down and invokes the Emergency Transfer.
System Protection
Protections are established to keep the DEFINITY System active and on line. The 
following 4 types of system protection are provided:
nOvervoltage
nSneak current
nLightning
nEarthquake
Overvoltage Protection
Protection from hazardous voltages and currents is required for all off-premises 
(out-of-building) trunks, lines, and terminal installations. Both over-voltage protection 
(lightning, power induction, and so forth) and sneak current protection are required. The 
following devices protect the system from overvoltages:
nAnalog trunks use the 507B Sneak Protector. Over-voltage protection is normally 
provided by the local telephone company.
nAnalog voice and 2-wire DCP terminals can use 1 of the following (or equivalent) 
types of combined overvoltage and sneak current protection:
— Carbon block with heat coil for UL code 4B1C
— Gas tube with heat coil for UL code 4B1E-W
— Solid state with heat coil for UL code 4C1S
nDCP and ISDN-BRI terminals use the solid state 4C3S-75 with heat coil protector, 
or equivalent.
nDS1/E1/T1 circuits require isolation from exposed facilities. A CSU (T1), LIU (E1), 
or other equipment provides this isolation. 
						

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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 of the network interface.
Sneak current protectors must be either UL listed/CSA certified or must comply with local 
safety standards. Sneak current protectors must have a maximum rating of 350 mA and a 
minimum voltage rating of 600V, or as required by local regulations. 
Lightning Protection
A Coupled Bonding Conductor (CBC) in the cabinet ground wiring protects the system 
from lightning. The CBC runs adjacent to wires in a cable and causes mutual coupling 
between itself and the wires. The mutual coupling reduces the voltage difference 
between ground and the DEFINITY ECS. 
When using a CBC, be sure that it connects to telecommunication cable that is firmly 
connected to an approved ground. In multiple-story buildings, be sure to connect the CBC 
to an approved ground at each floor.
The CBC can be a 10 AWG (5.3 mm
2/2.6 mm) ground wire, a continuous cable sheath 
surrounding wires within a cable, or 6 unused pairs of wire within a cable, twisted and 
soldered together. The CBC connects from the cabinet single-point ground bar in an 
AC-powered cabinet or the ground discharge bar in a DC-powered cabinet to the terminal 
bar at the cross-connect field.
When there is an Auxiliary cabinet, a 6 AWG (13.3 mm
2/4.1 mm) wire connects the 
system cabinet single-point ground block to the Auxiliary cabinet ground block. The 
ground wire routes as closely as possible to the cables that connect the system cabinet to 
the Auxiliary cabinet.
If equipment is not present in the Auxiliary cabinet, plug the power supply for this 
equipment into 1 of the 2 convenience outlets on the rear of the Multi-Carrier Cabinet, to 
preserve ground integrity. The convenience outlet is fused at 5 Amps. A dedicated 
maintenance terminal plugs into the other convenience outlet.