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Power Requirements for Digital Central Office Equipment
UNITED STATES DEPARTMENT OF AGRICULTURE
Rural Electrification Administration
BULLETIN 1751E-302
SUBJECT: Power Requirements for Digital Central Office Equipment
To: All Telephone Borrowers
REA Telephone Staff
EFFECTIVE DATE: Date of Approval
EXPIRATION DATE: Three years from effective date
OFFICE OF PRIMARY INTEREST: Central Office Equipment Branch,
Telecommunications Standards Division
PREVIOUS INSTRUCTIONS: This bulletin replaces REA
Telecommunications Engineering & Construction Manual (TE&CM) Section 302, Power Requirements for Community Central Office Equipment, Issue No. 6, dated April 1989.
FILING INSTRUCTIONS: Discard REA Telecommunications Engineering & Constructions Manual (TE&CM) 302, Power Requirements for Digital Central Office Equipment, Issue 6, dated April 1989, and replace it with this bulletin. File with 7 CFR 1751 and on REANET.
PURPOSE: This bulletin provides REA borrowers, and other interested parties with information concerning power requirements for digital central office equipment.
James B. Huff Sr. 10/15/93
____________________________ ___________________________
Administrator Date
TABLE OF CONTENTS
1. GENERAL.....................................................4
2. BASIS FOR CALCULATIONS......................................4
3. CALCULATIONS................................................6
FIGURE 1 - NORTHERN TELECOM, DMS-100......................8
FIGURE 1.1 - NORTHERN TELECOM DMS-100 (EXAMPLE).............9
FIGURE 1.2 - NORTHERN TELECOM DMS-100......................10
FIGURE 1.3 - NORTHERN TELECOM DMS-100 (EXAMPLE)............11
FIGURE 1.4 - NORTHERN TELECOM DMS-10 400 SERIES............12
FIGURE 1.5 - NORTHERN TELECOM DMS-10 400 SERIES (EXAMPLE)..13
FIGURE 1.6 - NORTHERN TELECOM DMS-10 400 SERIES............14
FIGURE 2 - SIEMENS STROMBERG-CARLSON DCO DCO-E/DCO-SE....16
FIGURE 2.1 - SIEMENS STROMBERG-CARLSON DCO DCO-E/DCO-SE....19
FIGURE 3 - REDCOM MDX....................................22
FIGURE 4 - AT&T 5ESS SWITCH..............................23
FIGURE 4.1 - AT&T 5ESS SWITCH (EXAMPLE)....................25
FIGURE 5 - MITEL GX5000..................................27
FIGURE 5.1 - MITEL GX5000 (EXAMPLE)........................28
FIGURE 6 - TRANSMISSION ELECTRONICS CURRENT DRAIN........29
FIGURE 7 - ESTIMATING TELEPHONE BATTERY SIZES............30
FIGURE 8 - CHARGER CAPACITY..............................31
INDEX:
Power Requirements For Digital Central Office Equipment
ABBREVIATIONS
AC Alternating Current
AH Ampere Hour
AM Administrative Module
AMAF Automated Message Accounting Frame
BHA Busy Hour Attempts
BMC Billing Media Converter
BTU British Thermal Unit
CC Common Control
CCS Hundred Call Seconds
CM Communication Module
CMF Control and Maintenance Frame
COE Central Office Equipment
CPU Central Processing Unit
CUA Circuit Unit Assembly
DAT Digital Analog Trunk
DC Direct Current
dc-ac direct current - alternating current
dc-dc direct current - direct current
DCI Digital Carrier Interface
DCM Digital Carrier Module
DCO-E Digital Central Office Exchange
DCS-SE Digital Central Office Small Exchange
DCTU Digital Carrier Trunk Unit
DLTU Digital Line & Trunk Unit
DTC Digital Trunk Controller
DTMF Dual - Tone Mutlifunction
GDSU Global Digital Service Unit
GPIO General Purpose Input Output
LCE Line Concentrating Equipment
LCE Line Concentrator Equipment
LGC Line Group Controller
LLS Local Line Switch
LTF Line Trunk Frame
LU Line Unit
MDX Modular Digital Exchange
MMSU Modular Metallic Service Unit
MSU Modular Shelf Unit
MTM Maintenance Trunk Module
OPM Outside Plant Module
OPSM Outside Plant Subscriber Module
P.E. Peripheral Equipment
PCCM Power Cooling Control Module
PDC Power Distribution Center
PWBA Printed Wire Board Assembly
RLCM Remote Line Concentrator Module
RLG Remote Line Group
RSLE Remote Line Subscriber Equipment
RSLM Remote Subscriber Line Module
SCM Subscriber Carrier Module
SLC Subscriber Loop Carrier
T&M Trunk and Maintenance
TM Trunk Module
TMF Toll Multifunction
TU Trunk Unit
v volts
1. GENERAL
1.1 This bulletin is intended to provide REA borrowers, consulting engineers, contractors and other interested parties with technical information for use in the design and construction of REA borrowers' telephone systems. It discusses, in particular, the methods used in calculating the power requirements for central offices. It provides means to calculate the required capacities of the storage batteries and charging equipment for particular applications.
1.2 This bulletin replaces REA TE&CM 302, Power Requirements for Digital Central Office Equipment, Issue No. 6, dated April 1989. This bulletin provides power calculation methods for various digital, stored program controlled central office equipment.
1.3 General specifications governing storage battery and charging equipment for proposed Central Office Equipment (COE) are covered in Items 12.1 and 12.2, Part III, of Bulletin 1753E-001 (Form 522), "REA General Specification for Digital, Stored Program Controlled Central Office Equipment." Based on these general specifications, determination of the required capacities of battery and charger is made by the manufacturer.
2. BASIS FOR CALCULATIONS
2.1 Charging equipment furnished with a central office should have sufficient capacity to supply the dc power necessary for the satisfactory operation of the office during the busy hour. This includes the dc requirements for carrier, loop extenders, voice frequency repeaters, and dc-dc converters or dc-ac inverters to operate input/output devices.
2.1.1 Determination of the requirements for emergency generating and charging equipment is covered in Bulletin 1751E-320, "Emergency Generating and Charging Equipment." A suggested method of charger size computation is provided in Figure 8.
2.2 Charging equipment for digital central offices should be provided on one of the following bases:
(a) Two chargers either of which is capable of carrying the
full office load; or
(b) Three chargers each of which is capable of carrying
half the office load.
Arrangement (a) may be used in any central office power system. Arrangement (b) may offer potential cost savings when applied to power requirements in relatively large digital, stored program controlled offices.
2.3 Storage Battery
2.3.1 The storage battery furnished with a central office should have sufficient capacity to supply the dc power necessary to sustain satisfactory operation of the exchange for the period specified.
Specific REA minimum requirements are in 7 CFR 1755.522, which is also contained in Part III of REA Bulletin 1753E-001 (Form 522). Appropriate allowances should be included for any equipment which is normally ac operated but arranged for dc operation in case of an ac failure. See paragraph 1.3 of this bulletin for location of specific requirements in central office equipment specifications.
2.3.2 The minimum usable voltage to be delivered to the central office equipment during battery discharge should be determined using COE manufacturer's design criteria. When power flows from the battery through the power board to the equipment, a voltage drop (IR loss) is experienced as a result of the resistance of the current carrying conductors. In many cases equipment design is based on 44 volts being available at the power entry to the bay. Performance of the digital COE at voltages less than 44 volts becomes unpredictable. For effective design, voltage drop from the source to the equipment bay is considered by allocation as follows:
Battery to Power Board 0.5
Power Board to Equipment Bay 0.5
Minimum Equipment Voltage 44.0
Total 45V dc - 45.0 Vdc
In the case of a 24-cell battery (45/24) = 1.88 volts per cell becomes the minimum operating voltage.
2.3.3 The computation of battery size to meet the site power requirement is described in Figure 7 - Estimating Telephone Battery Sizes. This method permits computation with differing numbers of hours of reserve and numbers of cells in the battery string. The computation is applicable to lead-acid batteries, lead antimony, or lead-calcium batteries (see manufacturer's data for capacity, dimensions, etc.).
2.3.4 REA recommends that the battery provided should have the capacity to maintain the central office load for a period of 8 hours. Systems that are equipped with emergency generators are allowed to reduce the 8 hours to a 3-hour reserve time.
2.3.5 Determination of battery capacity to be supplied should be based on power outages experienced at the site and on the evaluation of the future performance of the ac power system. Another consideration is the size of the dc load to be supplied. Small electromechanical switching systems have a limited amount of fixed power consuming devices, while a large part of system devices only require power when in use. As a result battery capacity determinations were made assuming busy hour switching activity. The telecommunications industry considers 8 busy hour battery capacity appropriate for most small installations. The expectation of 8 consecutive busy hours of usage following a power interruption was negligible, resulting in battery power being usable for longer than the 8-hour period. Power consumption in digital switching equipment is almost constant, whether or not calls are being processed. In addition, the total power consumed by digital switches is greater than the electromechanical systems. The concept of "busy hour drain" has lost its impact in digital offices where the operating drain represents the constant load. The solution most often used is to provide an emergency generator to supply power on a long-term basis and to install a battery with 3 hours capacity.
3. CALCULATIONS
3.1 The following sample calculations describe the suggested procedure to determine the power requirements for digital, stored program controlled central office equipment. Sample calculations are included for the following switching equipment types:
System
Manufacturer Designation
Figure 1 - Northern Telecom DMS-100, DMS-10
Figure 2 - Siemens Stromberg-Carlson DCO
Figure 3 - Redcom MDX
Figure 4 - AT&T 5 ESS
Figure 5 - Mitel GX5000
3.2 Figure 6 lists various power requirements for loop extenders, voice frequency repeaters, carrier equipment and other equipment.
3.3 Figure 7 illustrates the method used in determining the capacity of a storage battery required for a particular application. This figure also illustrates, in Example 2, a method for calculating the ampere-hour reserve of existing batteries when the current requirement of the central office equipment is changed as a result of equipment additions or higher than anticipated calling rates, etc.
3.4 Figure 8 illustrates the suggested method used in determining charger capacity required for a particular application. If 110 percent of the rated output of the charger is equal to or greater than the calculated charger dc current requirement, the charger is considered as satisfactorily meeting the specification requirements. Three suggested solutions in terms of the number of chargers and their capacity are included.
3.5 In some cases specialized equipment requires power at a voltage different from the -48V dc central office battery. Dc-dc converters can be supplied at +24V dc, +48V dc, +130V dc and other values. These other voltages are used to supply radio and carrier equipment operated at -24 volts, coin collect circuits at +130 volts and other equipment. The power required by the dc-dc converters has to be included in the total load to be carried by the central office dc power system.
3.6 It should be kept in mind that the calculation methods shown in this section are to provide estimates only. Engineering judgment has to be used for each individual application. It is, therefore, recommended that the manufacturer of the system be consulted for specific applications.
Figure 1 NORTHERN TELECOM DMS-100
DC DRAIN
1. Basic (CPU) 78.5
CC Frame E/W 4 Memory Shelves
I/O Frame E/W 2 Disk + 1 Mag Tape
2. PDC Bays x 6.5 Amps _____
3. LAMA or CAMA (10 Amps) _____
4. Combined Network Frame x 24 Amps _____
5. Double Shelf Network x 14 Amps _____
6. DTC x 8.5 Amps _____
7. MTM x 3.3 Amps _____
8. TM x 2.2 Amps _____
9. LGC x 8.5 Amps _____
10. Line Circuits LCE _______ x 8.2 + 4W (Note 1) _____
Subtotal _____
Customer Drain _______ _____
DMS Current Total _______ _____
Note 1: W = 2 way CCS per line in unit drain formula
Figure 1.1 NORTHERN TELECOM DMS-100
E X A M P L E
1000 Lines, 50 Digital Trunks, 50 Analog Trunks, 3.2 CCS/Line
DC DRAIN
1. Basic (CPU) 78.5
CC Frame E/W 4 Memory Shelves
I/O Frame E/W 2 disk + 1 Mag Tape Drive
2. PDC Bays 1 x 6.5 Amps 6.5
3. LAMA or CAMA, 10 Amps _____
4. Combined Network Frame 1 x 24 Amps 24.0
5. Double Shelf Network x 14 Amps _____
6. DTC 1 x 8.5 Amps 8.5
7. MTM 4 x 3.3 Amps 13.2
8. TM 1 x 2.2 Amps 2.2
9. LGC 1 x 8.5 Amps 8.5
10. Line Circuits LCE 1 x 8.2 + 4W (Note 1) 21.0
(Sample = 1 x 8.2 + 4 x 3.2 = 21)
Subtotal 162.4
Customer Drain 20 20.0
DMS Current Total 182.4
NOTE 1: W = 2 way CCS per line in unit drain formula
Figure 1.2 NORTHERN TELECOM DMS-100
HEAT DISSIPATION
Heat
Dissipation
Per Frame Total Heat
Type of Frame Quantity (Watts/Hr) Dissipation
Central Control Complex 1720 ___________
Input/Output Frame 850 ___________
Miscellaneous Equipment 220 ___________
Network Combined 1000 ___________
Digital Trunk Equipment 1120 ___________
Trunk Module Equipment
Frame 480 ___________
Line Concentrating
Equipment 1050 ___________
Line Group Equipment 980 ___________
Power Distribution Center 200 ___________
TOTAL WATTS/HOUR ___________
Figure 1.3 NORTHERN TELECOM DMS-100
E X A M P L E
1400 Lines, 50 Digital Trunks, 50 Analog Trunks, 3.2 CCS/L
HEAT DISSIPATION
Heat
Dissipation
Per Frame Total Heat
Type of Frame Quantity (Watts/Hr) Dissipation
Central Control Complex 1 1720 1720
Input/Output Frame 1 850 850
Miscellaneous Equipment 1 220 220
Network Combined 1 1000 1000
Digital Trunk Equipment 1 1120 1120
Trunk Module Equipment
Frame 2 480 960
Line Concentrating
Equipment 1 1050 1050
Line Group Equipment 1 980 980
Power Distribution Center 1 200 200
TOTAL WATTS/HOUR 8100
Figure 1.4 NORTHERN TELECOM STANDARD DMS-10 400 SERIES
DC DRAIN
Basic System 25.0 Amps
DCM Shelves x 4.0 = Amps
DCI Shelf x 3.0 = Amps
SCM-10S x 10.0 = Amps
P.E. Shelf x 0.75 = Amps
LCE Lines x 0.015 = Amps
BMC x 5.0 = Amps
D.C./A.C. Inverter (0.5 KW)________ x 15 = Amps
Total = Amps
Heat Dissipation
D.C. Drain
Northern Telecom DMS-10 400 Generic (3 Bay)
Basic System 30.0 Amps
P.E. Shelf x 0.75 = Amps
DCM Shelf x 4.0 = Amps
LCE Lines x 0.015 = Amps
Total = Amps
Heat Dissipation
D.C. Drain x 52 Watts
Figure 1.5 NORTHERN TELECOM STANDARD DMS-10 400 SERIES
Example #1
5000 Lines, 576 Trunks, 1 RLCM, 1 SLC-96, 1 RSLE, 1 RSLM
@ 3.2 CCS/line
DC Drain
Basic System 25.0 Amps
DCM Shelves 4 x 4.0 = 16.0 Amps
DCI Shelf 1 x 3.0 = 3.0 Amps
SCM-10S 1 x 10.0 = 10.0 Amps
P.E. Shelf 2 x 0.75 = 1.5 Amps
LCE Lines 5000 x 0.015 = 75.0 Amps
BMC 2 x 5.0 = 10.0 Amps
D.C./A.C. Inverter (0.5 KW) 1 x 15.0 = 15.0 Amps
Total = 155.5 Amps
Heat Dissipation
DC Drain 155.5 x 52 = 8086 Watts
Example #2
Northern Telecom DMS-10 400 Generic (3 Bay)
1280 Lines, 144 Trunks, @ 3.2 CCS
Basic System 30.0 Amps
P.E. Shelf 2 x 0.75 = 1.5 Amps
DCM Shelf 1 x 4.0 = 4.0 Amps
LCE Lines 1280 x 0.015 = 19.2 Amps
Total = 54.7 Amps
Heat Dissipation
D.C. Drain 54.7 x 52 = 2844 Watts
Figure 1.6 NORTHERN TELECOM STANDARD DMS-10 400 SERIES
(Page 1 of 2)
1 - Standard 400 Series AMPS
Basic System Current Drain 25.0
Network Module (Max. = 2 Modules) 12.0
DCM Shelf 4.0
DCI Shelf 3.0
SCM-10 (DMS-1) Shelf 4.0
SCM-10S (SLC-96) Module 10.0
Mag Tape Bay 7.8
BMC (each) 5.0
DC/AC Inverter 0.5 KW 15.0
DC/AC Inverter 1.0 KW 26.0
P.E. Lines 0.020
P.E. Shelf (with service circuits) 0.75
LCM Lines (per line) 0.015
2 - DMS-10 400 Series (3 bay) AMPS
Basic System Current Drain 30.0
(includes combination CPU/Network
shelf and GPIO shelf)
3 - DMS-10 400 series (2 bay) AMPS
CONTROL AND TRUNK BAY
CPU/Network Shelf (5.8 amps ea. two required) 11.6
GPIO Shelf 4.8
T & M Shelf 2.9
PCCM Shelf 1.5
DAT Shelf 2.9
LINE AND TRUNK BAY
Two Shelf LCM (E/W 640 Lines) 9.6
Bay Supervisory Panel 0.2
DAT Shelf each (max. = 2 shelves) 2.9
4 - DMS-10 400 Series (1 bay) AMPS
CPU/Network Shelf (5.8 amps ea. two required) 11.6
T & M Shelf 2.9
PCCM Shelf 1.5
DAT Shelf 2.9
FSP (Frame Supervisory Panel) and
LCM Shelf (E/W 256 lines) 4.8
Figure 1.6 NORTHERN TELECOM STANDARD DMS-10 400 SERIES
(Page 2 of 2)
5 - OPM AMPS
One Cabinet 15.0
Line Current 0.015/L
6 - OPSM AMPS
One Cabinet 9.0
Line Current 0.015/L
7 - RSLM AMPS
RSLM Bay 6.0
Line Current 0.015/L
8 - RSLE AMPS
RSLE Bay (up to 512 lines) 10.5
RSLE Bay (from 512 to 1024 lines) 21.0
Line Current 0.015/L
9 - RLCM AMPS
RLCM Bay 10.0
LCE Bay 0.015/L
Figure 2 SIEMENS STROMBERG - CARLSON DCO-E/DCO-SE
(Page 1 of 3)
DC DRAIN
1. CONTROL & MAINTENACE FRAME (CMF) WATTS
DCO-E CMF (ONE PER DCO-E) 1 X 2400 =_____
DCO-SE CMF (ONE PER DCO-SE) 1 X 2000 =_____
2. LOCAL LINE SWITCH FRAME (LLS) (DCO-E & DCO-SE)
Quantity of Lines ________ x ____CCS/L X 0.069 (LOAD) =_____
Quantity of Lines _____ X 0.158 (IDLE) =_____
Quantity Of Line CUAs _____ X 30.0 =_____
Quantity of RLG Host CUAs _____ X 31.0 =_____
Quantity of SLC Host CUAs _____ X 158.0 =_____
Quantity of LLS Frames _____ X 306.0 =_____
TOTAL LLS FRAME POWER REQUIREMENTS =_____
3. LINE/TRUNK FRAME POWER (LTF) (DCO-E ONLY) WATTS
Quantity of DTMF Receiver PWBAs _____ X 19.3 =_____
Quantity of DTMF Sender PWBAs _____ X 5.0 =_____
Quantity of TMF Receiver PWBAs _____ X 8.5 =_____
Quantity of TMF Sender PWBAs _____ X 3.9 =_____
Quantity of Busy Verification PWBAs _____ X 2.3 =_____
Quantity of Analog Trunk PWBAs _____ X 8.2 =_____
Quantity of LTF CUAs _____ X 19.3 =_____
TOTAL LTF POWER REQUIREMENTS =_____
4. DIGITAL TRUNK FRAME POWER (DTF) (DCO-E ONLY) WATTS
Quantity of T1 Interface PWBAs _____ X 11.2 =_____
Quantity of Message Assemblers _____ X 57.3 =_____
Quantity of DTF CUAs 67.4 =_____
TOTAL DTF POWER (WATTS) =_____
5. POWER RINGING & TEST FRAME POWER (PRTF) (DCO-E ONLY) WATTS
Power Ringing & Test Frame 1 X 92.0 = 92.0
TOTAL PRTF POWER REQUIREMENTS = 92.0
Figure 2 SIEMENS STROMBERG-CARLSON DCO-E/DCO-SE
(Page 2 of 3)
DC DRAIN
6. DATA COLLECTION FRAME POWER (AMAF)/(DCF) (DCO-E & DCO-SE) WATTS
AMA Frame (E/W Tape Drives) _____ x 495.0 =_____
CODC Data Collection Frame _____ X 523.0 =_____
TOTAL AMAF/DCF POWER REQUIREMENTS =_____
7. COMMON EQUIPMENT FRAME POWER (CEF) (DCO-E) & DCO-SE) WATTS
Variable (Dependent on OEM Equipment Installed)
TOTAL CEF POWER REQUIREMENTS =_____
8. UNIVERSAL POWER FRAME (DCO-SE ONLY) WATTS
Universal Power Frame (UPF) 1 X 92.0 = 92.0
Expanded Ringing CUA _____ X 70.0 =_____
*Universal Service CUA _____ X 155.0 =_____
*Universal Trunk/Service CUA _____ X 155.0 =_____
*Universal Trunk CUA _____ X 132.0 =_____
*Customber Trunk Group CUA _____ X 107.0 =_____
Quantity of DTMF Receiver PWBAs _____ X 19.3 =_____
Quantity of DTMF Sender PWBAs _____ X 5.0 =_____
Quantity of TMF Receiver PWBAs _____ X 8.5 =_____
Quantity of TMF Sender PWBAs _____ X 3.9 =_____
Quantity of Busy/Verification PWBAs _____ X 2.3 =_____
Quantity of Analog Trunk PWBAs _____ X 8.2 =_____
TOTAL UPF POWER REQUIREMENTS =_____
9. REMOTE LINE SWITCH POWER (RLS) WATTS
RLS Frame (1080 Lines Maximum) 1 X 906.0 =906.0
Quantity of Lines _____ X _____ CCS/L X 0.069 (LOAD) =_____
Quantity of Lines _____ X 0.158 (IDLE) =_____
Quantity of Line CUAs _____ X 30.0 =_____
Quantity of RLG CUAs _____ X 31.0 =_____
Quantity of SLC CUAs _____ X 158.0 =_____
TOTAL RLS FRAME POWER REQUIREMENTS =_____
*ONLY 3 CUAs TOTAL CAN BE EQUIPPED
Figure 2 STROMBERG-CARLSON DCO-E/DCO-SE
(Page 3 of 3)
DC DRAIN
10. REMOTE LINE SWITCH - 450 POWER (DC) WATTS
Basic DC Power (Maximum) = 1200
Maximum Allowed Customer Power = 250
RLS-450 DC POWER TOTAL WATTS (Maximum) = 1450
RLS-450 RATED AC POWER INPUT (Typical) = 6000
(Based on cold weather heating plus maximum short term load.)
SYSTEM DC POWER SUMMARY
11. DCO-E SYSTEM POWER WATTS
Total Control & Maintenance Frame Power = 2400
Total Local Line Switch Power =_____
Total Line/Trunk Frame Power =_____
Total Digital Trunk Frame Power =_____
Total Power Ringing & Test Frame Power = 92.0
Total AMA/Data Collection Frame Power =_____
Total Common Equipment Frame Power =_____
TOTAL DCO-E SYSTEM DC POWER REQUIREMENTS =_____ AMPS
TOTAL DCO-E DC BUSY HOUR LOAD (Total DC Power divided by
52.1 Volts) =_____
12. DCO-SE SYSTEM POWER WATTS
Total Control & Maintenance Frame Power = 2000
Total Local Line Switch Frame Power =_____
Total AMA/Data Collection Frame Power =_____
Total Universal Power Frame Power =_____
Total Common Equipment Frame Power =_____
TOTAL DCO-SE SYSTEM DC POWER REQUIREMENTS =_____
TOTAL DCO-SE DC BUSY HOUR LOAD =_____ AMPS
(Total DC Power divided by 52.1 Volts)
Figure 2.1 SIEMENS STROMBERG-CARLSON DCO-E/DCO-SE
(Page 1 of 3)
Example
1000 LINES AT 3.2 CCS
1. CONTROL & MAINTENANCE FRAME POWER (CMF) WATTS
DCO-E 1 X 2400 = 2400
DCO-SE 1 X 2000 = 2000
2. LOCAL LINE SWITCH FRAME (LLS) (DCO-E & DCO-SE) WATTS
Quantity of Lines 1000 X 3.2 CCS/L X 0.069 (LOAD) 220.8
Quantity of Lines 1000 X 0.158 (IDLE) = 158.0
Quantity of Line CUAs 12 X 30.0 = 360.0
Quantity of RLG Host CUAs 0 X 31.0 = 0
Quantity of SLC Host CUAs 0 X 158.0 = 0
Quantity of LLS Host CUAs 1 X 306.0 = 306.0
TOTAL LLS FRAME(S) POWER (WATTS) =1044.8
3. LINE/TRUNK FRAME POWER (LTF) (DCO-E ONLY)
Quantity of DTMF Receiver PWBAs 2 X 19.3 = 38.6
Quantity of DTMF Sender PWBAs 2 X 5.0 = 10.0
Quantity of TMF Receiver PWBAs 2 X 8.5 = 17.0
Quantity of TMF Sender PWBAs 2 X 3.9 = 7.8
Quantity of Busy Verification PWBAs 2 X 2.3 = 4.6
Quantity of Analog Trunk PWBAs 0 X 8.2 = 0
Quantity of LTF CUAs 2 X 19.3 = 38.6
TOTAL LTF POWER (WATTS) = 116.6
4. DIGITAL TRUNK FRAME POWER (DTF) (DCO-E ONLY)
Quantity of T1 Interface PWBAs 5 X 11.2 = 56.0
Quantity of Message Assemblers 0 X 57.3 = 0
Quantity of DTF CUAs 1 X 67.4 = 67.4
TOTAL DTF POWER (WATTS) = 123.4
5. POWER RINGING & TEST FRAME POWER (PRTF) (DCO-E ONLY)
Power Ringing & Test Frame 1 X 92.0 = 92.0
TOTAL PRTF POWER (WATTS) = 92.0
Figure 2.1 SIEMENS STROMBERG-CARLSON DCO-E/DCO-SE
(Page 2 of 3)
Example
6. AMAF/DATA COLLECTION FRAME (AMAF/CODC) (DCO-E & DCO-SE) WATTS
AMA Frame _____ X 495.0 =_____
CODC Data Collection Frame _____ X 523.0 =_____
TOTAL AMAF/DCF POWER (WATTS) = 0
7. COMMON EQUIPMENT FRAME POWER (CEF) (DCO-E) & DCO-SE)
Variable (Dependent on OEM Equipment Installed)
TOTAL CEF POWER (WATTS) = 0
8. UNIVERSAL POWER FRAME (DCO-SE ONLY) WATTS
Universal Power Frame (UPF) 1 X 92.0 = 92.0
Expanded Ringing CUA X 70.0 =______
*Universal Service CUA X 155.0 =______
*Universal Trunk/Service CUA 1 X 155.0 = 155.0
*Universal Trunk CUA 1 X 132.0 = 132.0
*Customber Trunk Group CUA 1 X 107.0 = 107.0
Quantity of DTMF Receiver PWBAs 2 X 19.3 = 38.6
Quantity of DTMF Sender PWBAs 2 X 5.0 = 10.0
Quantity of TMF Receiver PWBAs 2 X 8.5 = 17.0
Quantity of TMF Sender PWBAs 2 X 3.9 = 7.8
Quantity of Busy/Verification PWBAs 2 X 2.3 = 4.6
Quantity of Analog Trunk PWBAs 0 X 8.2 = 0
TOTAL UPF POWER (WATTS) = 564.0
9. REMOTE LINE SWITCH POWER (RLS)
RLS Frame (1080 Lines Maximum) 1 X 906.0 = 906.0
Quantity of Lines 1000 x 3.2 CCS/L X 0.069 = 220.8
Quantity of Lines 1000 X 0.158 = 158.0
Quantity of Line CUAs 12 X 30.0 = 360.0
Quantity of RLG CUAs _____ X 31.0 =______
Quantity of SLC CUAs _____ X 158.0 =______
TOTAL RLS FRAME POWER (WATTS) =1644.8
*ONLY 3 CUAs TOTAL CAN BE EQUIPPED
Figure 2.1 SIEMENS STROMBERG-CARLSON DCO-E/DCO-SE
(Page 3 of 3)
Example
10. REMOTE LINE SWITCH - 450 POWER (DC) WATTS
TYPICAL Basic RLS-450 (Maximum) = 1200
CUSTUMBER POWER (250W Maximum) = 0
TOTAL RLS-450 DC POWER TOTAL WATTS (Maximum) = 1200
RLS-450 Rated Ac Power Input (Typical) = 6000
(Based on typical cold weather heating plus maximum short term system load.)
11. SYSTEM DC POWER SUMMARY
1. DCO-E SYSTEM POWER
Total Common Control Frame Power =2400.0
Total Local Line Switch Power =1044.8
Total Line/Trunk Frame Power = 116.6
Total Digital Trunk Frame Power = 123.4
Total Power Ringing & Test Frame Power = 92.0
Total AMA/Data Collection Frame Power = 0
Total Common Equipment Frame Power = 0
TOTAL DCO-E SYSTEM DC POWER REQUIREMENTS =3776.8
TOTAL DCO-E DC BUSY HOUR LOAD (TOTAL WATTS/52.1 VOLTS) = 72.5 AMPS
12. DCO-SE SYSTEM POWER
Total Control & Maintenance Frame Power =2000.0
Total Local Line Switch Frame Power =1044.8
Total AMA/Data Collection Frame Power = 0
Total Universal Power Frame Power = 564.0
Total Common Equipment Frame Power = 0
TOTAL DCO-SE SYSTEM DC POWER REQUIREMENTS =3608.8
TOTAL DCO-SE DC BUSY HOUR LOAD (TOTAL WATTS/52.1 Volts) = 69.3 AMPS
FIGURE 3 REDCOM MDX
DC DRAIN
Quantity Multiply By Amps
MSU Shelves (One per 40 Lines) __________ 3.5 _______
HEAT DISSIPATION
Heat Dissipation (Watts) = 52.1 x DC Drain ________ = _______ Watts
E X A M P L E
150 Lines
DC DRAIN
Quantity Multiply By Amps
MSU Shelves (One per 40 Lines) 4 3.5 14
HEAT DISSIPATION
Heat Dissipation (Watts) = 52.1 x DC Drain 14 = 730 Watts
FIGURE 4 AT&T 5ESS SWITCH
(Page 1 of 2)
DC DRAIN
1. Basic (AM and CM) 55.76
2. No. of Disk Drive Units _____ x 1.30 Amps _______
3. No. of Switching Modules w 32Mb Memory _____ x 9.94 Amps _______
4. No. of MMSUs _____ x 0.20 Amps _______
5. No. of LUs _____ x 5.60 Amps _______
6. No. of TUs _____ x 0.18 Amps _______
7. No. of DCTUs _____ x 2.00 Amps _______
8. No. of GDSUs _____ x 0.61 Amps _______
9. No. of DLTUs _____ x 0.02 Amps _______
10. No. of DLTU Packs _____ x 0.12 Amps _______
SUBTOTAL _______
Additional Drains _______
TOTAL DC Drain _______
FIGURE 4 AT&T 5ESS SWITCH
(Page 2 of 2)
HEAT DISSIPATION
Heat
Dissipation
Per Frame Total Heat
Type of Frame Quantity (BTUs) Dissipation
Basic (AM and CM) ________ 9931.42 ______
No. of Disk Drives ________ 231.54 ______
No. of Switching Modules ________ 1770.41 ______
No. of MMSUs ________ 36.27 ______
No. of LUs ________ 997.42 ______
No. of TUs ________ 32.95 ______
No. of DCTUs ________ 356.22 ______
No of GDSUs ________ 108.05 ______
No. of DLTUs ________ 174.55 ______
TOTAL BTUs ______
FIGURE 4.1 AT&T 5 ESS SWITCH
(Page 1 of 2)
EXAMPLE
1 SM Office with 1000 Analog Lines,
12 Analog Trunks, and 192 Digital Trunk Circuits.
DC DRAIN
1. Basic (AM and CM) 55.76
2. No. of Disk Drive Units 4 x 1.30 Amps 5.20
3. No. of Switching Modules w 32Mb Memory 1 x 9.94 Amps 9.94
4. No. of MMSUs 11 x 0.20 Amps 2.20
5. No. of LUs 3 x 5.60 Amps 16.80
6. No. of TUs 4 x 0.18 Amps 0.72
7. No. of DCTUs 1 x 2.00 Amps 2.00
8. No. of GDSUs 3 x 0.61 Amps 1.83
9. No. of DLTUs 1 x 0.02 Amps 0.02
10. No. of DLTU Packs 8 x 0.12 Amps 0.96
SUBTOTAL 95.43
Additional Drains _______
TOTAL DC Drain 95.43
FIGURE 4.1 AT&T 5ESS SWITCH
(Page 2 of 2)
EXAMPLE
1 SM Office with 1000 Analog Lines,
12 Analog Trunks, and 192 Digital Trunk Circuits
HEAT DISSIPATION
Heat
Dissipation
Per Frame Total Heat
Type of Frame Quantity (BTUs) Dissipation
Basic (AM and CM) 1 9931.42 9931.42
No. of Disk Drives 4 231.54 926.16
No. of Switching Modules 1 1770.41 1770.41
No. of MMSUs 11 36.27 398.97
No. of LUs 3 997.42 2992.26
No. of TUs 4 32.95 131.80
No. of DCTUs 1 356.22 356.22
No of GDSUs 3 108.05 324.15
No. of DLTUs 1 174.55 174.55
TOTAL BTUs 17005.94
FIGURE 5 MITEL GX5000
D.C. DRAIN
EQUIPMENT QUANTITY MULTIPLY BY WATTS
First peripheral pair and Main
control (includes all features,
AMA, matrix and first cabinet) 1 460 460
Additional peripheral pair 96 ___
Additional cabinet 105 ___
Single Party line card (16 ckts) 10 ___
DS1 trunk card (2 spans) 29 ___
Universal line card (6 ckts) 9 ___
Total D.C. Drain Watts
Converted to AMPS (Watts/Battery Voltage) = Watts/52 = ____ Amps
Heat dissipation = _____ Watts or (3.41 X ____Watts) = ____ BTU
FIGURE 5.1 MITEL GX5000
Example System: 1008 lines, 96 Digital Trunks
D.C. DRAIN
EQUIPMENT QUANTITY MULTIPLY BY WATTS
First peripheral pair and Main
control (includes all features,
AMA, matrix and first cabinet) 1 460 460
Additional peripheral pair 2 96 192
Additional cabinet 1 105 105
Single Party line card (16 ckts) 63 10 630
DSI trunk card (2 spans) 2 29 58
Universal line card (6 ckts) 0 9 0
Total D.C. Drain 1,445 Watts
Converted to AMPS (Watts/Battery Voltage) = 1,445 Watts/52 = 27.7 Amps
Heat dissipation = 1,445 Watts or (3.41 X 1,445 Watts) = 4927 BTU
Figure 6 TRANSMISSION ELECTRONICS CURRENT DRAIN
48-Volt Battery Drain
Amperes Per Unit
Equipment
Loop Extenders 0.075
VF Repeaters
1. Negative Impedance 0.035
2. Hybrid 0.035
3. Automatic Gain Control 0.080
4. Loop Extender/Repeater Combination 0.100
5. Automatic Gain Control
Loop Extender/Repeater Combination 0.200
Carrier Systems
1. D1 or D2 3.0
2. D3 (24 Channel) 0.7
3. D4 (24 Channel) 0.35
4. T1 Span Line 0.6
5. Station Carrier (1 Channel) 0.04
6. Station Carrier (Multi-Channel) Per Channel 0.1
7. Pair Gain Devices (Switching)
(See Notes 1 & 2 for Office End)
Echo Canceller
1. VF (1 Channel) 0.075
2. Digital (24 Channel) 1.7
Remote Office Line Test
1. Test Console (110V ac, 0.4A) 0.7
2. Remote Terminal 0.7
120V, 60Hz Load
Maintenance and Control Center Amperes Per Unit (Note 3)
Co-located with COE:
Video Display (CRT) 0.5
Printer (1200 Baud) 0.5
Remotely Located:
Teletypwriter (e/w 300 Baud Modem) 0.35
NOTES:
1. Refer to the manufacturer's data sheets for specific current drain
requirements.
2. Line concentrators or other pair gain devices incorporating switching
functions are generally locally powered at remote site.
3. Voltage: 95 to 128V ac - Frequency: 48 to 65Hz
Figure 7 ESTIMATING TELEPHONE BATTERY SIZES
8-Hour Ampere Hour Capacity Required
for Each Ampere of Load
Number of Hours Final Cell Voltages
Reserve 1.75 1.80 1.85 1.88 1.90 1.95
1 2.2 2.5 2.8 3.2 3.5 5.0
2 3.2 3.4 3.7 4.3 4.7 6.2
3 4.0 4.3 4.7 5.2 5.6 7.5
4 4.9 5.1 5.6 6.1 6.5 8.6
5 5.7 6.0 6.5 7.0 7.4 9.6
6 6.5 6.8 7.3 7.8 8.2 10.6
7 7.2 7.6 8.1 8.7 9.1 11.6
8 8.0 8.3 8.9 9.6 10.0 12.6
9 8.8 9.1 9.6 10.4 10.9 13.7
10 9.5 9.9 10.4 11.4 12.0 15.0
Voltage (24 Cells) 42 43.2 44.4 45.1 45.6 46.8
EXAMPLES:
1. Required: The capacity of a 24-cell battery to handle a 3-hour load of 34.0 amperes to a limited voltage of 45 volts.
45/24 = 1.88
From the above chart, each ampere of load requires 5.2 ampere hours of capacity.
Total capacity required = 5.2 x 34.0 = 177 ampere hours. Select next larger catalog size.
2. Calculate the ampere hour reserve of an existing 24-cell, 480-ampere hour battery with the load increased to 69 amperes to a final voltage of 1.88 volts.
Formula: K = B/C
Where
K = 8-hour ampere hour capacity required for
each ampere of load.
B = Ampere hour capacity of existing battery.
C = Actual current drain of all equipment.
K = 480/69 = 7.0
On the chart, locate 7.0 in the 1.88-volt column
and to the left read 5 hours of reserve.
FIGURE 8 CHARGER CAPACITY
The battery charger has to supply power for operation of the COE. Its capacity should be great enough to carry the entire load, including peak power requirements, to avoid taking power from the battery. Additional capacity is required to recharge the battery after a power service interruption.
EXAMPLE:
Drain 66 Amps
Battery Discharged for 3 Hours and Recharged
in 12 Hours: 3 x 66 / 12 = 16.5 Amps
Calculated Charger DC Current Requirement 82.5 Amps
Rated Charger Capacity (as indicated in
Paragraph 3.4) 75 Amps
The charger capacity sizes commercially available include:
2 @ 75 Amps - Traditional arrangement with
load sharing between the two
chargers.
3 @ 50 Amps - Potential cost saving over
buying two larger units.
Potential operating cost
saving by operating only
two units.
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