Comtest Networks 2745 Manuale utente

Rev 1-0 May 2018 Page 1 of 4

Model 2745 24x12 Power Combiner Installation Guide

Comtest Networks Inc.

This guide provides the basic information required to install the Comtest Model 2745 24x12 Power Combiner Shelf

on a 19 or 23 inch rack assembly.

Unpackingthe2745Shelf

Before opening the 2745 shipping box, carefully inspect for any signs of damage. If the box has been damaged,

note the damage before opening the box. Open the box and remove the 2745 shelf and carefully examine it for

any damage. If the shelf is damaged, contact your supplier for instructions to return it for a replacement. If there is

no damage, verify that all packed items have been received. You should receive the following:

Comtest model 2745 shelf, part number SA-2745-1201

Quantity 1 Rack Mounting Bracket kit, part number SA-2745-0010

oQuantity 2 Rack Mount Brackets, part number PD-2745-0010

Quantity 1 Mounting hardware kit, part number SA-0000-0001

oQuantity 4, 10-32 x 3/8 screws, part number HW-PP06-05SS

oQuantity 4, #10 external tooth lock washers, part number HW-WE06-00SS

Quantity 1 Ground Kit, part number CA-2745-0013

Quantity 2 Power Combiner Cables, part number CA-2745-0014

Quantity 1 Installation Guide SA-2745-1217

If any of the above items are missing, please contact your supplier.

Installation

The 2745 requires ½U (0.875 inches) of rack space. The shelf is supplied with mounting brackets and hardware to

allow installation in a 19 inch or 23 inch rack.

Preparation for Mounting

19 Inch Mounting

For 19 inch mounting, the long side of the

mounting bracket is attached to the side of

the shelf. There are three positions to mount

the bracket on the shelf and four positions on

the mounting bracket. The Rack Mounting

Bracket can also be mounted with the flange

at the back. Thus, there are 24 possible

mounting positions for the Rack Mounting

Bracket. Choose a suitable mounting

position for the shelf then, using the provided

10-32 screws and lock washers, attach the

bracket to each side of the shelf. Place the

shelf in position on the rack and, using the

appropriate screws and lock washers, attach

the shelf to the rack. Please note the

hardware (screws) required to mount the

shelf to the rack is not supplied with the 2745

shelf mounting kit.

Rev 1-0 May 2018 Page 2 of 4

23 Inch Mounting

For 23 inch mounting, the short side of

the mounting brackets is attached to

the side of the shelf. There are three

positions to mount the brackets on the

shelf. Choose a suitable mounting

position for the shelf then, using the

provided 10-32 screws and lock

washers, attach the bracket to each

side of the shelf. Place the shelf in

position on the rack and, using the

appropriate screws and lock washers,

attach the shelf to the rack. Please

note the hardware (screws) required to

mount the shelf to the rack is not

supplied with the 2745 shelf mounting

kit.

CablingOverview

New Installations

The 2745 Shelf cabling configurations will vary depending on installation locations and the number of lines

supported by the DSLAM. However, the physical interface to the rear panel connectors is standard 50-pin RJ-21

type receptacle connectors. Each splitter card uses 24 pairs of the 25 pairs available on each 50-pin connector.

After the shelf has been attached to the rack, the cabling can be prepared as shown below

For improved DSL performance, Comtest recommends the use of CAT 5, or better, cabling on the DSL connectors

for our 2745 Power Combiner Shelf in order to ensure that optimum system performance is achieved and

maintained. Comtest suggest that the CAT 5 mating connectors used be equipped with either a 90oor 120ocover

so that routing of the cables is simplified.

CAUTION - To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cord/cable.

Install the cables in the following sequence:

Connect xDSL Cable first

Insert the screw through the connector

cover and into the RJ-21 connector, on

the back panel, and carefully tighten.

Connect SPAN Cable second

Assemble the connector cover and plug

as above.

Rev 1-0 May 2018 Page 3 of 4

xDSL IN

Combined xDSL & SPAN Power OUT

SPAN Power IN

Ring

Tip

Ring

Tip

Ring

Tip

DSL 1

DSL 1 + Power 1

Power 1

DSL 2

DSL 2 + Power 1

Power 2

DSL 3

DSL 3 + Power 2

Power 3

DSL 4

DSL 4 + Power 2

Power 4

DSL 5

DSL 5 + Power 3

Power 5

DSL 6

DSL 6 + Power 3

Power 6

DSL 7

DSL 7 + Power 4

Power 7

DSL 8

DSL 8 + Power 4

Power 8

DSL 9

DSL 9 + Power 5

Power 9

DSL 10

DSL 10 + Power 5

Power 10

DSL 11

DSL 11 + Power 6

Power 11

DSL 12

DSL 12 + Power 6

Power 12

DSL 13

DSL 13 + Power 7

DSL 14

DSL 14 + Power 7

DSL 15

DSL 15 + Power 8

DSL 16

DSL 16 + Power 8

DSL 17

DSL 17 + Power 9

DSL 18

DSL 18 + Power 9

DSL 19

DSL 19 + Power 10

DSL 20

DSL 20 + Power 10

DSL 21

DSL 21 + Power 11

DSL 22

DSL 22 + Power 11

DSL 23

DSL 23 + Power 12

DSL 24

DSL 24 + Power 12

ConnectorPinOuts

The Model 2745 is a 24 port combiner that provides the required filtering for running Strand Power (+/-190VDC) and providing

VDSL2 copper transport over the same copper pairs.

Grounding

For safety reasons, the 2745 needs to be grounded to the rack through a ground terminal located on the right side

rear of the shelf. Use the hardware provided to attach your ground wire to the shelf. Note, 8 AWG wire is

recommended for the ground.

Rev 1-0 May 2018 Page 4 of 4

Warranty

Comtest warrants all equipment manufactured by it and bearing its nameplate to be free from defects in

workmanship and materials, during normal use and service, for a period of three (3) years from the date of

shipment. In the event that a defect in any such equipment arises within the warranty period it shall be the

responsibility of the customer to return the equipment by prepaid transportation to a Comtest service centre prior to

the expiration of the warranty period for the purpose of allowing Comtest to inspect and repair the equipment. If

inspection by Comtest discloses a defect in workmanship or material it shall, at its option, repair or replace the

equipment without cost to the customer, and thereafter return it to the customer by the least expensive mode of

transportation the cost of which shall be prepaid by Comtest. In no event shall this warranty apply to equipment

which has been modified without the written authorization of Comtest, or which has been subject to abuse, neglect,

accident or improper application. If inspection by Comtest discloses that the repairs that must be made on the

equipment are not covered by this warranty, the regular repair charges shall apply to any repairs made to the

equipment.

This warranty constitutes the only warranty applicable to the equipment sold by Comtest and no other warranty or

condition, statutory or otherwise, expressed or implied shall be imposed upon Comtest nor shall any representation

made by any person including a representation by a representative or agent of Comtest be effective to extend the

warranty coverage provided herein. In no event (including, but not limited to the negligence of Comtest, its agents

or employees) shall Comtest be liable for special or consequential damages or damages arising from the loss of

use of the equipment and on the expiration of the warranty period all liability of Comtest whatsoever in connection

with the equipment shall terminate.

Canada Help

171 Macfarlane Rd., Unit E techhelp@comtestnetworks.com

Ottawa, Ontario 1-877-369-5499 (Canada)

K2E 6V4, Canada Fax: 1-613-368-4616

Tel: 1-613-369-5499

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