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posted:: 12/2/2011
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9f4355c6-1ef1-4285-8f75-7d70aefa8450.xls
This spreadsheet is subject to change- it should be downloaded on each use to ensure you are using the latest version.

This is the Introduction Tab; experienced users may wish to select the "Calculator" tab..

Blue fields means user should add data
Orange fields are for the calculator use only
Green fields are for descriptive text information
Yellow fields are for fields describing input text

Step by Step Instructions

This calculator is used to estimate maximum "reach" from a power converter to a SureReach unit. The
SureReach unit powers an [ONT]. The reach depends on the maximum power needs of this device. Each
device's power need may be different depending on vendor, number of lines active, and state (I.e. if it is in
start up, some devices require double the "steady-state" power for the length of the start up).

1. Familiarize yourself with the terminology in the description and pictures in the "Model Description Tab".
Typically, the "device" is an ONT, and the "upstream port" is +/- 190 volt (which is 380 VDC total) module or
card on a rack in the Central Office or a field cabinet/pedestal.

2. Find the max. power required for a device. Some typical examples are:

Steady-State Peak/Surge
Power in Watts power in Watts Device
18 36 Vendor 12 Volt ONT
24 48 Vendor 48 Volt MDU-ONT
[users may add their own]

Note that many devices have separate "peak" or "surge" power requirement that may last as long a seconds
and may not always be documented on product sheets. Such events as start-up, restart, off hook, and
ringing, for ONTs, for example, require more power. In many cases this is a result of the basic nature of
supporting a telephone and not the electronics of the ONT. Thus a configuration should be designed to
handle the peak or surge power.

3. Select your model. If you want to compare max. reach for different configurations, use Model A. If you
have an actual loop, with possibly multiple gauges in the field, use Model B. Model C is used if you have
measured the actual loop resistance (typically used for troubleshooting lines).

4. If Model A

a. click on the "Calculator" tab and use the "Max. Power" for the device
b. Blue fields are for data entry; the results are in the orange fields

c. Enter the steady-state and peak/surge power required for each device as in the table above

d. If you are powering more than one of the above described devices off of one SureReach, then
enter the number next. Note that the total wattage can not exceed 55 watts.

e. To save upstream ports, you can have multiple SureReach units sharing one upstream port,
as long as you don't exceed the max. 100 watts supported by the upstream port; note that the
loop resistance uses up some of that power budget as well. Enter the number here.; if you get a
warning, you have exceeded the max. power for the upstream port.

f.. Enter the "gauge" of the twisted pair wire from the upstream port to the SureReach. If you
have multiple gauges, you have to use Model B.

g. You can extend the distance and/or power by joining multiple twisted pairs together. Enter the
number of twisted pairs connected together that will be used between the upstream port and the
SureReach units.

h. Here is an example of a single port powering one SureReach powering one 36 watt ONT over
a single 24 gage twisted pair wire.

Steady-state Power required by each device 12
Peak/surge Power required by each device (surge <1 32
Number of Devices, "n", powered by each SureReach 2
Number SureReach units "m", sharing one upstream port 1
Wire Gauge of Transmission Line Pair: 19,22,24 or 26 24
Number of Transmission Line Loop Pairs, "t" 1

i. The Maximum "reach" field will be automatically calculated; if in the field the device in at a
particular location is at a greater distance than this reach, try increasing the number of pairs. You
then know how may pairs you need from the Upstream [CO] to power the device.

5. If Model B, first create a loop "makeup". This is a Telco term for the length by gauge of the twisted pair
wire from the Central Office/Node to the location

a. Click on the "Calculator tab

b. Blue fields are for data entry; the results are in the orange fields

c. Enter the configuration values as above, and then enter the line makeup values in feet in the
blue field in Model B (example below):
Number feet of 19 gauge 1000
Number feet of 22 gauge 1000
Number feet of 24 gauge 1000
Number feet of 26 gauge 1000
Number of Transmission Line Loop Pairs, "t" 1
d.. You can extend the distance and/or power by joining multiple twisted pairs together. Enter the
number of twisted pairs connected together that will be used between the upstream port and the
SureReach units.

e. The max. number of watts available for that twisted pair "makeup" will be automatically
calculated. If the max. power is less than the power required, increase the number of
transmission line loop pairs in the blue field; this will tell you how may twisted pairs you need to
bring from the Upstream (CO) to deliver the required power.

5. If Model C, measure the actual total loop resistance of the loop

a. Click on the "Calculator tab

b. Blue fields are for data entry; the results are in the orange fields

c. Enter the configuration values as above, and then enter the measured resistance in ohms in
the blue field (example below):

Measured loop resistance in ohms 770

e. Note: The max. power in watts available for that twisted pair "makeup" will be automatically
calculated. If the max. power is less than the power required, increase the number of
transmission line loop pairs in the field, and re-measure the loop resistance.

7. Note: SureReach units are rated for a maximum power of 55 Watts All DC/DC converters use some
power themselves which is turned into heat; the higher the load the higher the heat. It is normal for the
SureReach to be warm to the touch. While SureReach can handle higher loads in short surges (up to 70-75
watts), the max. temperate the unit can handle is based on 55 watts steady-state.
sing the latest version.
Description:
Model A: See picture to right. SureReach is a voltage converter unit that uses Network Line
Power to provide reliable power to devices on the outside of buildings or at other outdoor locations.
NLP has two parts: 1) a power supply port in the Central Office (the "upstream" power) and 2)
SureReach units (the "downstream power") which supply devices such as Optical Network
Termination Devices (ONT), media converters, repeaters, ect. with power. The two are connected
by one, two, or "t" Transmission Line Pairs of twisted pair copper called the local line loop. Each
upstream power module port can provide 100 watts maximum at +- 190VDC.

Multiple or "m" downstream SureReaches can be installed off the upstream port over one or more
twisted pairs, and the total power required by the "m" units plus the power loops of the loop should
not exceed 100 watts. For FTTH applications, the SureReach unit will typically power ONTs; for
FTTB it may power MDU-ONTs, media converters, repeaters or other devices. Multiple or "n"
such devices can be powered off one SureReach if they are only a short distance from the unit and
the total power required is less than 55 watts. See illustration to the right.

Loop model B: See picture to right. Line loops from Central Offices are often more complex than
the single loop gauge assumed in Model A. Often, loops start off with the thinnest (26) gauge wire,
then shift to higher gauges, in order to keep the total loop resistance under an acceptable minimum.
For this model, the max power load supported by SureReach for a given wire loop "makeup" can be
calculated. As with Model A, it is possible to have multiple Devices off a single SureReach, or
multiple line loops "t" supplying power. subject to the 100 watt upstream port and 55 watt
downstream SureReach limits.

Since twisted pairs have some resistance depending on wire gauge, and the resistance depends on
length, the maximum "reach" of the given system can be calculated for a particular combination of
the above parameters. This calculator will work for either the 12VDC or 48VDC option for
SureReach. Note 1: Power losses due to the resistance in cabling between SureReach and the
Device are not included in this calculator. Note 2: Power maximum in practice is a function of
environmental conditions- temperature, wind, sun, placement, etc.- which are not included in this
theoretical calculation, and may vary from device to device depending on load, manufacturer, and
other conditions.

Loop model C See picture to right. Line loops from Central Offices sometimes do not
follow makeup, or the records are not available for the network. For this model, the max
power load supported by SureReach for a given wire loop can be calculated from an actual
measured value in ohms. As with Model A, it is possible to have multiple Devices off a
single SureReach, or multiple line loops "t" supplying power. subject to the 100 watt
upstream port and 55 watt downstream SureReach limits.
9f4355c6-1ef1-4285-8f75-7d70aefa8450.xls
A B C F G H

for +/- 190 VDC Supply
1

2 SureReach Network Line Power Calculator
3

4 Project Description [optional]:
5 office

6 site

7 Model A: (typically used for planning)
8 Given Device power and cable gauge, find max. reach for a configuration
9
10 Inputs: (enter data in blue field- all power is in watts)
11 Steady-state Power required by each device 5
12 Peak/surge Power required by each device (surge <1 second) 5
13 Number of Devices, "n", powered by each SureReach 1
14 Number SureReach units "m", sharing one upstream port 1
15 Wire Gauge of Transmission Line Pair: 19,22,24 or 26 24
16 Number of Transmission Line Loop Pairs, "t" 1
17
18 Outputs:
19 Steady-state Power required from each SureReach 5
20 Max. peak/surge power required from each SureReach 5
21 Total steady-state power required for all devices on port 5
22 Total Peak/surge power required for all devices on port 5
23 Maximum Reach in feet if steady-state power is limit 105,205
24 Maximum Reach in feet if peak/surge power is limit 105,205
25 Calculated Loop Resistance in ohms if steady-state power is limit 5,401
26 Calculated Loop Resistance in ohms if steady-state power is limit 5,401
27

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A B C F G H
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32 Model B: (typically used to aid installation)
33 Given loop "makeup" , find max. available power for a configuration
34
35 Configuration Inputs: (enter data in blue field)
36 Steady-state Power in watts required by each device 5
37 Peak Power in watts required by each device (surge <1 second) 5
38 Number of Devices, "n", powered by each SureReach 1
39 Number SureReach units "m", sharing one upstream port 1
40 Makeup Inputs:
41 Number feet of 19 gauge 0
42 Number feet of 22 gauge 0
43 Number feet of 24 gauge 14,600
44 Number feet of 26 gauge 0
45 Number of Transmission Line Loop Pairs, "t" 1
46
47 Makeup Outputs:
48 Total distance in feet 14,600
49 Calculated Combined Paris Looped Resistance in ohms 750
50 Max. Power Available for all Device's on port in watts 36.43
51
52 Configuration Outputs: (watts)
53
54 Steady-state Power required from each SureReach 5
55 Max. peak/surge power required from each SureReach 5
56 Total steady-state power required for all devices on port 5
57 Total Peak/surge power required for all devices on port 5
58 Tolerance (spare power) steady-state 31.43
59 Tolerance (spare power) peak/surge 31.43
60 Calculated steady-state (loaded) SureReach input voltage 317.4
61 Calculated steady-state (loaded) loop current 0.0817

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A B C F G H
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63
64 Model C:
65 Given measured loop resistance , find max. power
66
67 Configuration Inputs: (enter data in blue field)
68 Steady-state Power in watts required by each device 5
69 Peak Power in watts required by each device (surge <1 second) 5
70 Number of Devices, "n", powered by each SureReach 1
71 Number SureReach units "m", sharing one upstream port 4
72
73 Measured Inputs:
74 Measured loop resistance in ohms for one pair 750
75 Number of Transmission Line Loop Pairs, "t" 4
76
77 Loop Outputs:
78 Max. Power Available for all Device's in watts 73.40
79 Combined "n" pair resistance 188
80 Configuration Outputs:
81 Steady-state Power required from each SureReach 5
82 Max. peak/surge power required from each SureReach 5
83 Total steady-state power required for all devices on port 20
84 Total Peak/surge power required for all devices on port 20
85 Tolerance (spare power) steady-state 68.40
86 Tolerance (spare power) peak/surge 68.40
87 Calculated steady-state (loaded) SureReach input voltage 329.26
88 Calculated steady-state (loaded) loop current 0.2632
89
90
91
92

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Note: This Calculator is based on mathematical models only, using standard estimates for good copper lines and normal
power converter efficiency. Actual values may vary for power parameters and line resistance in loops in the field. This
calculator is for information purposes only, and is subject to Change. Generonix does not guarantee that actual field
conditions will match predicted results. The user should note that many devices are rated for steady-state power and
surges may occur for varying lengths and durations beyond the ability of SureReach to handle. This information is provided
as is without any express or implied warranties. While effort has been taken to ensure the accuracy of the information
contained in this text, the authors/maintainers/contributors assume no responsibility for errors or omissions, or for damages
93 resulting from the use of the information contained herein.
94
95 Annealed Copper Wire resistance taken from: Reference Data for Engineers, 1956 Edition 4;
96
97 Line and Loop resistance of Annealed Copper Wire in ohms per foot
98 gauge line resistance loop res.
99 19 0.008051 0.016102
100 22 0.01614 0.03228
101 24 0.02567 0.05134
102 26 0.04081 0.08162
103
104
105
106
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