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Acom Line Subrack (ALS)

025-9599A.1

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Limited Warranty

Buyer assumes responsibility for the selection of the Products to achieve buyer's or its customers intended results obtainedfrom the Products. If buyer has provided Zetron with any requirements, specifications or drawings, or if Zetron provides

buyer with such materials, such materials are provided solely for buyers convenience and shall not be binding on Zetronunless agreed in writing by the President of Zetron. ZETRON DOES NOT WARRANT THAT THE PRODUCTS OR ITSCUSTOMERS REQUIREMENTS OR SPECIFICATIONS OR THAT OPERATION OF THE PRODUCTS WILL BEUNINTERRUPTED OR ERROR FREE. SUBJECT TO THE LIMITATIONS SET FORTH BELOW, Zetron warrants that

all Zetron Products and Zetron Accessories will be free from material defects in material and workmanship for one yearfrom date of shipment (except where indicated otherwise in the Zetron Price Book). For buyers convenience, Zetron may

purchase and supply additional items manufactured by others. In these cases, although Zetrons warranty does not apply,

buyer shall be the beneficiary of any applicable third party manufacturers warranties, subject to the limitations therein.Zetron's warranty covers parts and Zetron factory labor. Buyer must provide written notice to Zetron within the warranty

period of any defect. If the defect is not the result of improper or excessive use, or improper service, maintenance orinstallation, and if the Zetron Products or Zetron Accessories have not been otherwise damaged or modified after shipment,AS ZETRON'S SOLE AND EXCLUSIVE LIABILITY AND BUYER'S SOLE AND EXCLUSIVE REMEDY, Zetron shall

either replace or repair the defective parts, replace the Zetron Products or Zetron Accessories or refund the purchase price, atZetron's option, after return of such items by buyer to Zetron. Shipment shall be paid for by the buyer. No credit shall beallowed for work performed by the buyer. Zetron Products or Zetron Accessories which are not defective shall be returned at

buyer's expense, and testing and handling expense shall be borne by buyer. Out-of-warranty repairs will be invoiced at the

then - current Zetron hourly rate plus the cost of needed components. THE FOREGOING WARRANTY AND THE THIRD

PARTY MANUFACTURER'S WARRANTIES, IF ANY, ARE IN LIEU OF ANY AND ALL OTHER WARRANTIESEXPRESSED, IMPLIED OR ARISING UNDER LAW, INCLUDING, BUT NOT LIMITED TO, THE IMPLIEDWARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE.

Limitation of Liability

Zetron makes no representation with respect to the contents of this document and/or the contents, performance, and functionof any accompanying software. Further, Zetron reserves the right to revise this document or the accompanying software and

to make changes in it from time to time without obligation to notify any person or organization of such revisions or changes.

ZETRON SHALL NOT UNDER ANY CIRCUMSTANCES BE LIABLE TO BUYER OR ANY THIRD PARTY FOR

ANY INCIDENTAL, SPECIAL, CONSEQUENTIAL OR INDIRECT LOSS OR DAMAGE ARISING OUT OF ORCONNECTED WITH BUYER'S PURCHASE OR USE OF PRODUCTS OR SERVICES, INCLUDING WITHOUT

LIMITATION, LOSS OF USE, LOSS OR ALTERATION OF DATA, DELAYS, LOST PROFITS OR SAVINGS, EVEN

IF ZETRON HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AND EVEN IF THE LIMITEDREMEDY ABOVE IS FOUND TO FAIL OF ITS ESSENTIAL PURPOSE. IN NO EVENT SHALL ZETRON'SLIABILITY (WHETHER FOR NEGLIGENCE OR OTHER TORT, IN CONTRACT OR OTHERWISE) EXCEED THE

PRICE PAID TO ZETRON FOR THE PRODUCTS.

IP networks by their nature are subject to a number of limitations, such as security, reliability, and performance. Anyone

using non-dedicated IP networks, such as shared WANs or the Internet, to connect to any Zetron Products or systems shouldconsider and is responsible for these limitations.

Zetron, Inc. All rights reserved. This publication is protected by copyright; information in this document is subject to changewithout notice. Zetron and the Zetron logo are registered trademarks of Zetron, Inc. Other company names and productnames may be the trademarks or registered trademarks of their respective owners. This publication may not be reproduced,

ranslated, or altered, in whole or in part, without prior written consent from Zetron, Inc.

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3

Compliance Statements

The regulatory compliance of an Acom Line Subrack (ALS) depends on the cards that are installed in the subrack. Forcompliance information, refer to the line cards manual of each type of line card installed in the ALS.

Products and batteries with the symbol (crossed-outwheeled bin) cannot be disposed as householdwaste. Old electrical and electronic equipment and

batteries should be recycled at a facility capable ofhandling these items and their waste byproducts.

Contact your local authority for details in locating arecycle facility nearest to you.

Proper recycling and waste disposal will helpconserve resources whilst preventing detrimentaleffects on our health and the environment.

Notice: The sign Pb below the symbol forbatteries indicates that this battery contains lead.

Information on Disposal of Old Electrical and Electronic Equipment and

Batteries (applicable for EU countries that have adopted separate wastecollection systems)

Safety Summary

STOP

Warning! For your safety and the protection of the equipment, observe these

precautions when installing or servicing Zetron equipment.

Follow all warnings and instructions marked on the equipment or included in documentation.

Only technically qualified service personnel are permitted to install or service the equipment.

Be aware of and avoid contact with areas subject to high voltage or amperage. Because somecomponents can store dangerous charges even after power is disconnected, always discharge

components before touching.

Never insert objects of any kind through openings in the equipment. Conductive foreignobjects could produce a short circuit that could cause fire, electrical shock, or equipmentdamage.

Remove rings, watches, and other metallic objects from your body before openingequipment. These could be electrical shock or burn hazards.

Ensure that a proper electrostatic discharge device is used, to prevent damage to electroniccomponents.

Do not attempt internal service of equipment unless another person, capable of rendering aidand resuscitation, is present.

Do not work near rotating fans unless absolutely necessary. Exercise caution to prevent fansfrom taking in foreign objects, including hair, clothing, and loose objects.

Use care when moving equipment, especially rack-mounted modules, which could becomeunstable. Certain items may be heavy. Use proper care when lifting.

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4 025-9599A.1

Change List for Rev A, 17 February 2010

First released version.

This document replaces the ALS section in 025-9574.

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Overview

5

Contents

Acom Line Subracks ........................................................................................ 7

Overview ................................................................................................................................ 7

Mounting ................................................................................................................................ 9Card Installation ................................................................................................................... 10Cloning an Acom ALS .................................................................................................. 12

Electrical Isolation ................................................................................................................ 13Grounding ............................................................................................................................ 15

Building Earth Conductors ........................................................................................... 15Acom Earth Connections ............................................................................................. 15

Signal Cable Connections ................................................................................................... 17Standard Cable Assemblies......................................................................................... 17Connection of Cable Shields........................................................................................ 18Surge Suppression and Protection .............................................................................. 18

Digital Trunked Radio Gateway ........................................................................................... 19Specifications ....................................................................................................................... 21

Power Connection ........................................................................................................ 21Absolute Maximum Ratings ......................................................................................... 21Physical Characteristics 19 in. Subrack .................................................................... 22Mean Time Between Failure ........................................................................................ 22

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Overview

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Overview

7

Acom Line Subracks

Overview

An Acom Line Subrack (ALS) is an enclosure that houses circuit cards for doing specific

functions. The circuit cards control the functionality of the Acom system. Each type ofcircuit card is specific to a type of function, and by installing different card combinations,gives the system new capability for performing different applications. Also, because the

cards are easy to install and combine, system redundancy and robustness are easy tocreate.

Figure 1: Cabinet Configurations

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Overview

8 025-9599A.1

Installation of the Acom Line Subracks may involve the following activities described inthis document:

Adequate and reliable power must be available to the subracks in accordancewith isolation and safety requirements described in applicable standards, local

statutes, and codes of practice.

All power connectors must be compatible with subracks.

Proper grounding must be available for the subracks.

ALSs are typically housed in 45 RU cabinets. 1 Rack Unit (RU) equals 1.75 in (4.45 cm).You can combine ALSs that have different card population types to create different

functionality.

In a redundancy configuration, if an ALS goes offline for any reason, the ChangeoverSubrack automatically switches operation to another ALS so that no functionality is lost.

The standby ALS becomes the main ALS. (SeeFigure 1.)

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Mounting

9

Mounting

The subrack is a 6-RU high, 19-inch card frame with dimensions as listed in the Acom

Line Subrack specifications. The Acom subrack has side mounting flanges with 7 mmdiameter holes spaced as shown inFigure 2.Recommendations for mounting a subrackare as follows:

A space of one RU minimum should be provided at the top and bottom of thesubrack to provide adequate ventilation. The space at the bottom of the subrack

also provides space for cable entry to line cards.

A minimum clearance of 50 mm must be provided at the rear of the subrack forelectrical clearance.

Connection of standard cable assemblies must be in accordance Zetron standards.

Installation of required primary surge protection devices (e.g., gas discharge

arresters) must be in accordance with Zetron standards.

Figure 2: Subrack Mounting Hole Arrangement

190 mm

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Card Installation

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Card Installation

An Acom Line Subrack (ALS) has positions for 13 plug-in cards. The positions are

numbered 0 to 12 from left to right across the subrack as shown inFigure 3.

The following lists the circuit cards that are typical to a system installation:

Card Description

CCC Changeover Control Card

COV-T 3-Way Coaxial Switch

COV-V or COV-R 48/96 Way Switch

DIU1-2 Data Interface Unit, RS-232, 6-channel

DIU1-4 Data Interface Unit, RS-422, 6-channel

EIE Exchange Interface Unit

EMU 4-Wire E&M Interface Unit

MCU Main Control UnitMSU Main Supply Unit

RGU Ring Generator Unit

RIU Radio Interface Unit

SMU Signaling Management Unit

TIE Telephone Interface Unit

UIO Universal Input/Output Unit

All system cards use DIN41612 style connectors to connect to the subrack backplane.Cards should be inserted carefully to ensure that the card edges are in the guide slots

before firmly mating the rear connector with the backplane.

Figure 3: Fully Populated ALS

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Card Installation

11

Some cards may require setting jumper links and DIP switches prior to installation in thesubrack. This information is provided in the installation description for each card. The

rules for installing cards at a system level are as follows and listed inTable 1.

An ALS must have an MCU card in slot 0; this card becomes the Primary MCU.

An ALS must have an MSU card in slot 12.

An additional MSU card may be fitted in Slot 11; in this slot the MSU works as aredundant/backup power supply. When there is no second MSU this slot becomesavailable to line cards.

Slot 1 can only be used for MCU, SMU, RGU, or UIO cards.

If fourteen G.703 interfaces are present (i.e., seven MCU duals), all cards mustbe installed before power-up. In this configuration the cards are no longer hotpluggable.

Figure 4: Acom ALS Layout

2 3 4 5 6 7 8 9

M

S

U

1210

Empty

slot

1110

M

C

U

Empty

slot

Empty

slot

Empty

slot

Empty

slot

Empty

slot

Empty

slot

Empty

slot

Empty

slot

Empty

slot

Empty

slot

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Card Installation

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Table 1: Acom Line Subrack Card Installation

Slot Number

0 1 2 3 4 5 6 7 8 9 10 11 12

MCU M

DIU1-2

DIU1-4

EIU

EMU

TIE

RGU SeeAcom Ring Generator Unit(P/N 025-9604)

RIU

RVA

EIE

SMU

UIO

MSU M

Legend:

M - (Mandatory) every subrack must have an MCU (single or dual) in slot 0 and an MSU in slot 12.

- A card of this type may be fitted to this slot if required.

- A card of this type must not be fitted to this slot.

Cloning an Acom ALS

Cloning the main configuration from the main rack to the backup rack is a fast way tocopy your changes to the standby ALS and keep both racks in sync. It is assumed that

both ALSs have identical cards. For the procedure, see Cloning an ALSinAcom

Maintenance(P/N 025-9574).

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Electrical Isolation

13

Electrical Isolation

The Acom system is designed to connect and operate with other information technology

and telecommunications equipment. An important aspect of this requirement is to provideisolation for the interfaces and power connections.

In general, the Acom system circuits connected to external lines or toTelecommunications Network Voltage (TNV) circuits have the facility to be isolated

from the backplane supplies. The channels for the EIE, TIE, EMU, RIU, and MSU cardsare intended for external line connection and can be isolated. The main interfaces of the

MCU are designed for G.703 compliance, and the signal lines are isolated with themetallic outer conductors grounded.

The Acom backplane is also designed to provide electrical isolation and is divided into anupper board and a lower board. The upper board carries the Safety Extra Low Voltage(SELV) circuits such as TTL and CMOS signals between cards. The lower board carries

TNV circuits such as the ring voltage, battery voltage. (These may carry hazardousvoltages from external transmission lines.)

Table 2: Acom SELV and TNV Circuits

Hardware SELV TNV

MCU G.703 Interfaces

MSU G.712 Interface

MSU Input Supply

MSU VBATand VV Supplies

TIE interfaces

EIE interfaces

EMU/RIU connected to SELV source

EMU/RIU connected to TNV source

EMU/RIU using backplane source

Ringer Output

Ringer External Input

Upper Backplane

Lower Backplane

External connections to subrack

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Electrical Isolation

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Additional isolation considerations are as follows:

Any cables bundled with external TNV cables are themselves considered to beTNV, even if the lines are local (e.g., to telephones in the same building).

The EMU and RIU have the option of being either TNV or SELV, depending onthe jumper settings of channels. If the jumpers are changed so that referencevoltage is taken from the front connector, the EMU and RIU are isolated from

both TNV and SELV and can be used for either application.

As a special case, if the only TNV connection to the system is through thecoaxial G.703 interfaces, the whole subrack is considered SELV. In this case aSELV approved power supply is required. The jumpers on the EMU could then

be used to provide battery voltage to the E&M leads from the backplane without

violating isolation.

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Grounding

15

Grounding

Building Earth Conductors

There are two types of earth connections required for an Acom installation: protectiveearth (PE) and telecom earth (TRC). PE is the normal building earth used to connectmains voltage. TRC is provided for connecting circuits to a clean earth and is notintended for safety purposes.

Typically, there should be one connection between PE and TRC in the building (subjectto installation requirements and local regulations). The connection point should be as

close to the incoming earth point (earth stake or earth grid connection point) as possible.

Acom Earth Connections

The Acom system provides a number of earth connections at the rear of the subrack. Theconnections provided are shown inFigure 5 on page16.

A description for each connection is described in the following table.

Table 3: Acom Earth Connection

Connection Description PE TRC SELV TNV

J15: 1 and 2 Subrack chassisconnection

J14: 2 and 3 SELV system earth

J18: 1 to 4 SELV electrostatic

discharge protection

J20: 1 +VBAT (DC power

positive supply)

J17: 2 to 4 TNV electrostatic

discharge protection

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Grounding

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Figure 5: Acom Subrack Earth Connections

J13-BATGNDGNDRING

J14

Upper BackplaneJ15

J13PROTECTIVE

EARTH

(PE)

J18

Lower Backplane

J20

J17

TNVESDGNDTELECOMEARTH

(TRC)

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Signal Cable Connections

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Signal Cable Connections

Standard Cable Assemblies

The recommended method of signal cable connection is to use standard cable assemblies,which are available in a range of lengths. The assemblies are fitted with ferrite coreswhen required for compliance to EMC standards. A sample of available types are listedin the following table.

TipMost cable assemblies will designate a length at the end of the part number.

An additional -M or -F indicates meters or feet.

For example, cable 709-7699-10-F D indicates a 10 foot long cable, revision D

(fourth revision of the cable with this number).

Table 4: Acom ALS Cable Assemblies

Part Numbers Cable Assembly

709-0065 Cat5e Cable

709-0146 COV-R to RJ21 Patch Panel Cable

709-7345 MCU Programming Cable

709-7592 SMU Diagnostic cable

709-7607 MSU to tail (Krone)

709-7608 CCC to Krone

709-7612 SMB to SMB

709-7613 BNC to BNC

709-7770 E1 Crossover Cable

709-0161 RIU to COV-R Upper Cable

709-0102 RIU to COV-R Lower Cable

709-7834 EIE to COV-R Upper Cable

709-7828 EIE to COV-R Lower Cable

709-7835 UIO to COV-R Upper Cable

709-7723 UIO to COV-R Lower Cable

709-7868 MCU(T1) to COV-R Upper Cable

709-7869 MCU(T1) to COV-R Lower Cable

950-0550 RJ-21 male to Krone

950-0551 RJ-21 female to Krone

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Signal Cable Connections

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Connection of Cable Shields

Shielding for the G.703 cables must be properly connected during installation toguarantee proper system operation. The metallic bodies of the G.703 SMB connectors

used on the 75-ohm version of the MCU may be connected to ground as required byG.703. Jumper links are provided on the MCU card to connect the shields for receive andtransmit lines as required.

Surge Suppression and Protection

The TIE, EIE, EMU and RIU cards have surge suppression circuits. To work effectivelythe subrack must to be grounded in accordance with the preceding section.

The protection provided by the Acom is considered secondary protection only. If the lines

connected to the Acom can be exposed to direct or near miss lightning strikes, the surgesgenerated can far exceed the rated capacity of the surge suppression circuits. External

protection systems must be installed to ensure that the circuits do not carry the full surgecurrent.

Note Warranty claims for card damage as a result of indirect orinduced lightning strikes will not be accepted.

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Digital Trunked Radio Gateway

19

Digital Trunked Radio Gateway

The Digital Trunked Radio Gateway configuration is used to transmit voice

conversations over data networks using Voice over Internet Protocol (VoIP). A typicalAcom Line Subrack can be configured to handle VoIP signaling requirements for theGateway configuration, allowing voice packet processing. The Digital Trunked RadioGateway contains three types of cards, MCUs, SMUs, and a single MSU. An example of

a Digital Trunked Radio Gateway Acom Line Subrack is shown in the following figure.

Figure 6: VoIP Acom Line Subrack Example

2 3 4 5 6 7 8 9

M

S

U

1210

Empty

slot

1110

M

C

U

M

C

U

S

M

U

S

M

U

S

M

U

S

M

U

S

M

U

S

M

U

S

M

U

S

M

U

S

M

U

CTRL VoiceVoice Voice Voice Voice Voice Voice VoiceHDLC

bridge

Each Digital Trunked Radio Gateway ALS can handle up to ten SMU cards; one controland up to nine voice. One MCU card is used as the main control unit for the entiresubrack and is connected to the DS3 Switch by an E1 link. A Secondary MCU may beused as the HDLC bridge to a hot standby Gateway. The main purpose of the HDLC

bridge is to transfer HDLC messages to keep the main Control SMU and standby Control

SMU in synchronization. Alternatively this link can be configured to operate via the maincommunication channel links between the ALS and the Acoms main switchingequipment. The MSU provides +5 and 12 Vdc power to all the cards in the subrack.

Each SMU card is equipped with one 10Base-T Ethernet controller for connecting to theEthernet LAN. Except for the dedicated control SMU, which processes control messages,all the SMU cards in the Digital Trunked Radio Gateway process VoIP packets and arereferred to as Voice SMUs. Each voice SMU can handle up to 6 talkpaths of voice traffic

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Digital Trunked Radio Gateway

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(incoming and outgoing calls). There is only one control SMU in the main system andone in the standby system.

When processing audio, the SMU card converts PCM data (circuit switch based voice

data) into IP voice packets (packet switch-based voice data) for the outgoing calls, andconverts IP voice packets into PCM data for the incoming calls.

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Specifications

21

Specifications

Power Connection

The input power to the subrack can be anywhere from 20 to 60 Vdc supply. Power isconnected to the subrack in the following ways:

To the MSU in slot 12, which converts the incoming supply to +5, +12 and 12volts and regulates the incoming supply for +VBAT and VBAT voltages. Theoutputs from the MSU are connected to the backplane that powers other cards in

the subrack.

To an optional MSU in slot 11. When two MSU cards are installed, the outputcurrent load is shared between the cards. One card will take up the load if the

other card fails or is switched off. To signaling circuits on the EMU and MSU. This may be required to isolate

signaling circuits from the subrack. Alternately, the signaling circuits may be fedfrom the backplane supply using jumper links on the card.

For card specifications and associated interfaces, refer to the specific cards manual.

Absolute Maximum Ratings

Table 5: Absolute Maximum Ratings

Parameter Conditions

Storage Temperature -10 to 70C (14 to 158oF)

Operating Temperature 0 to 60 C (32 to 140 F)

Operating Humidity 45% RH (non-condensing) @ 45 C (113 F)

Note Absolute maximum ratings for individual cards and associatedinterfaces are described in the card sections.

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Specifications

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Physical Characteristics 19 in. Subrack

Table 6: Physical Characteristics

Parameter Typical Units

Overall Width 482 (19) mm

Overall Depth 346 mm

Overall Height 265 (6 RU) mm

Weight of empty subrack 3.5 Kg

Mean Time Between Failure

Hardware Part Number MTBF (years)*

Backplane Upper 950-0502 237.9

Backplane Lower 950-0501 478.6

* Using HRD5 model (temperature controlled locations)