(Page 1 of 1 in this chapter) Version


Chapter 7

AG 2000 E&M Board


7.1 Introduction
7.2 Different Board Features
7.2.1 DSPs
7.2.2 Signaling Modules
7.2.3 Connector
7.2.4 Status Indicator LEDs
7.2.5 External Power Connector
7.3 Configuring the Hardware
7.3.1 Configuring the DIP Switch
7.3.2 Configuring the Transmission Path
7.3.3 Configuring Audio Transmission Levels
7.3.4 Signaling
7.4 Cabling and Power Supply
7.4.1 E&M Power Supply and Associated Cable
7.4.2 Telephone Interface Cable
7.4.3 Two Wire, Type IA or Type IB Cross Connections
7.4.4 4 Wire, Type IB or Type VB Cross Connections
7.4.5 4 Wire, Type IA or Type VA Cross Connections
7.5 Editing the AG Configuration File
7.5.1 Naming Conventions for QSLAC Files
7.5.2 QSLAC Files and TCPs for E&M
7.6 Sample AG Configuration Files
7.6.1 AG 2000 E&M Without H.100 Connectivity
7.6.2 AG 2000 E&M With H.100 Connectivity
7.7 Verifying the Installation
7.7.1 Using ctatest With an AG 2000 E&M Board
7.8 E&M Trunk Interface Signaling Bits
7.8.1 E&M Transmit Signaling
7.8.2 E&M Receive Signaling
7.9 Hardware Specifications
7.9.1 Common Specifications
7.9.2 Compliance
EMC
Safety
Telecom

7.1 Introduction

E&M signaling is commonly used for trunk signaling when the two equipment pieces are located within the same building. It is commonly preferred because of the four wire option of the transmission path and the simplicity of the signaling. However, it can take up to six wires per telephone trunk, including both the transmission and signaling leads.

E&M signaling normally provides trunks to connect equipment within the building or campus. It is not commonly used to connect customer premise equipment directly to the public network.

7.2 Different Board Features

The AG 2000 E&M board has most of the features of the other AG 2000 models that are referenced in Section 1.2, AG 2000 Board Features. Refer to the preface in this manual for the generic information that applies to all AG 2000 boards. This chapter addresses only those areas where the AG 2000 E&M board differs from the AG 2000 loop start, subscriber loop, and DID boards.

7.2.1 DSPs

As shown in Figure 21, an AG 2000 E&M board has up to four high-performance digital signal processors (DSPs) which provide resources for 8 ports of call processing and programmable voice processing. Each DSP supports one or more tasks. These tasks include voice recording and playback, DTMF detection and generation, and call progress analysis.

7.2.2 Signaling Modules

The AG 2000 E&M board supports E&M signaling modules:

Figure 21. AG 2000 E&M Board

7.2.3 Connector

Due to the increased number of conductors at the interface, the connector on the AG 2000 E&M board is different from other AG 2000 boards. The AG 2000 E&M board has a DB-62 connector on the end bracket as shown in Figure 22:

Figure 22. AG 2000 E&M DB-62 Connector

7.2.4 Status Indicator LEDs

The AG 2000 E&M board has four indicators (LEDs) on the end bracket of the board (refer to Figure 23).

The board locate indicator identifies the board using the software. The status indicator remains on after the board is booted. For the AG 2000 E&M board, High Batt is set to ON which indicates that the LED must be lit for proper operation. It is not required for the Low Batt LED to be lit.

Figure 23. LEDs on the End Bracket

7.2.5 External Power Connector

As shown in Figure 24, the external power connector is located on the end bracket of the AG 2000 E&M board:

Figure 24. External Power Connector on the AG 2000 E&M Board

7.3 Configuring the Hardware

For information about installing the board, refer to Section 2.5.1, Installing the Board in Your System.

7.3.1 Configuring the DIP Switch

The AG 2000 E&M DIP switch is located on the component side of the board.

DIP switch S1 controls the H.100 bus termination. By default, all S1 switches are set to OFF (H.100 bus termination disabled). Setting switch S1 to ON enables H.100 bus termination. You should only set switch S1 to ON for the boards that are on the ends of the H.100 bus.

DIP switch S1 should be set to either all ON or all OFF.

7.3.2 Configuring the Transmission Path

This section explains how to configure the transmission path of the E&M signaling modules and the AG 2000 E&M board.

2 Wire or 4 Wire

The AG 2000 E&M board has two transmission modes:

The AG 2000 E&M board is shipped as 4 wire. 2 wire may be enabled by:

  1. Changing, on the baseboard, all S2 to ON for trunks 1 - 4 and changing S3 to ON for trunks 5 - 8.

    
    
    
    
    Figure 25. Changing Switches S2 and S3

    
    
  2. Changing SW5 on signaling module A for trunks 1 - 4 and changing SW5 on signaling module B for trunks 5 - 8. Refer to Figure 26 and to the following table:

    
    
    
    
    Figure 26. Changing SW5

This table presents the SW5 settings for either 2 wire or 4 wire:
Switch

2 Wire

4 Wire

1

ON

OFF

2

OFF

ON

3

ON

OFF

4

OFF

ON

5

ON

OFF

6

OFF

ON

7

ON

OFF

8

OFF

ON

9

ON

OFF

Also, the QSLAC file will automatically change to 2w from 4w when the system boots as a result of Steps 1 and 2.

7.3.3 Configuring Audio Transmission Levels

In E&M trunk interfaces, it is common for the far end to specify the audio transmission levels as TLP (Transmission Level Points). This defines the relative test tone power level at that point. The TLP specification can be converted to gain by the following tables.

Note: The sign changes from one table to the other. The default gain is 0 db. This should be used if no TLP is specified. Transmission Level Point to Gain Translation
Transmit

Receive

TLP -db

Gain -db

TLP -db

Gain -db

6

6

6

-6

5

5

5

-5

4

4

4

-4

3

3

3

-3

2

2

2

-2

1

1

1

-1

0

0

0

0

-1

-1

-1

1

-2

-2

-2

2

-3

-3

-3

3

-4

-4

-4

4

-5

-5

-5

5

-6

-6

-6

6

Refer to Section 6.3, Line Gain for more information on setting the gain value.

7.3.4 Signaling

The AG 2000 E&M board has four types of signaling:

We recommend that you order the correct signaling type and allow NMS to configure and test the board. If switches are incorrectly set, the board may be damaged.

The signaling information is conveyed by an E lead in one direction and an M lead in the other direction (E&M).

Type I signaling is the most common type in North America. Type IA must interface to type IB. Both signaling types use an earth ground as a reference. A common convention (not a rule) is that the A side is the public network or PBX and the terminal is configured to be the B side.

The nine switches on SW1, SW2, SW3, and SW4 on the AG 2000 E&M signaling modules must be set as follows for the IA, IB, VA, and VB signaling types:

IA

IB

VA

VB

1

On

Off

On

Off

2

Off

On

Off

On

3

Off

On

Off

On

4

On

Off

On

Off

5

On

Off

Off

Off

6

On

Off

On

On

7

Off

On

Off

Off

8

On

Off

Off

Off

9

Off

On

On

On

WARNING:

Disconnect the power supply before changing the switch settings.

The AG 2000 E&M board can be optioned for either the A side or the B side:

Figure 27. E&M Lead Signaling - Type I


The signaling wiring is connected from the A side E lead to the B side E lead as shown in Figure 28:

Figure 28. E&M Lead Signaling - Type V


Type V is common in Europe. Type I and Type V use earth ground as the reference.

7.4 Cabling and Power Supply

7.4.1 E&M Power Supply and Associated Cable

      1. Set the power supply to -48 VDC.

        
        
      2. Connect the E&M power cable to the power supply.
        This wire...

        Which is labeled...

        Goes to...

        Red

        BATT

        Minus terminal

        Dark black

        RETURN

        Positive terminal

        Light black

        GND

        Com

        
        
      3. Plug the other end of the power cable to the power connector on the board.

        
        
      4. If additional boards need power, use the internal 3-way power connector to connect up to three boards together.

        
        
        
        
        Figure 29. Connecting the E&M Power Supply to the AG 2000 Board

        
        Note:  Test level 5777 provides the E&M power supply and the E&M power cable.
        

7.4.2 Telephone Interface Cable

A custom cable (NMS part number 31728) is required to connect from the DB-62 connector to a 66 block (RJ-21 type 25 pair telco connector).

Figure 30. Cable for the DB-62 Connector and the RJ-21 Connector


The DB-62 connector has the following pinouts (X = no connection):
Pin

Connector

Pin

Connector

1

Tip 2A

32

Ring 8B

2

Ring 2A

33

X

3

Tip 2B

34

X

4

Ring 2B

35

E2

5

Tip 5A

36

M2

6

Ring 5A

37

E5

7

Tip 5B

38

M5

8

Ring 5B

39

E8

9

Tip 8A

40

M8

10

Ring 8A

41

X

11

Tip 8B

42

-48 V

12

X

43

Tip 1A

13

X

44

Ring 1A

14

E3

45

Tip 3A

15

M3

46

Ring 3A

16

E6

47

Tip 4A

17

M6

48

Ring 4A

18

X

49

Tip 6A

19

Batt Return

50

Ring 6A

20

Batt Return

51

Tip 7A

21

X

52

Ring 7A

22

Tip 1B

53

X

23

Ring 1B

54

X

24

Tip 3B

55

Frame Gnd

25

Ring 3B

56

E1

26

Tip 4B

57

M1

27

Ring 4B

58

E4

28

Tip 6B

59

M4

29

Ring 6B

60

E7

30

Tip 7B

61

M7

31

Ring 7B

62

X

The 25 pair telco connector has the following pinouts:
Pin

Description

Pin

Description

1

Ring 1A

26

Tip 1A

2

Ring 1B

27

Tip 1B

3

M1

28

E1

4

Ring 2A

29

Tip 2A

5

Ring 2B

30

Tip 2B

6

M2

31

E2

7

Ring 3A

32

Tip 3A

8

Ring 3B

33

Tip 3B

9

M3

34

E3

10

Ring 4A

35

Tip 4A

11

Ring 4B

36

Tip 4B

12

M4

37

E4

13

Ring 5A

38

Tip 5A

14

Ring 5B

39

Tip 5B

15

M5

40

E5

16

Ring 6A

41

Tip 6A

17

Ring 6B

42

Tip 6B

18

M6

43

E6

19

Ring 7A

44

Tip 7A

20

Ring 7B

45

Tip 7B

21

M7

46

E7

22

Ring 8A

47

Tip 8A

23

Ring 8B

48

Tip 8B

24

M8

49

E8

25

Batt Return

50

Frame Gnd

The signaling wiring is connected from the A side E lead to the B side E lead as shown in Figure 31, Figure 32, Figure 33, and in Figure 34.

7.4.3 Two Wire, Type IA or Type IB Cross Connections

As shown in Figure 31 and in Figure 32, the 2 wire with E&M interface actually consists of four wires: tip, ring, E lead, and M lead. The tip and ring leads form the two-way audio path. The E&M leads are used for direct-current signaling.

A side equipment sends signals on the M lead and receives signals on the E lead. B side equipment sends signals on the E lead and receives signals on the M lead.

Figure 31. 2 Wire, Type 1A or Type IB Cross Connections with AG 2000 E&M Board as B Side Equipment




Figure 32. 2 Wire, Type 1A or Type IB Cross Connections with AG 2000 E&M Board as A Side Equipment

7.4.4 4 Wire, Type IB or Type VB Cross Connections

The 4 wire with E&M interface consists of six conductor leads (or three pairs), as shown in Figure 33. Audio transmission toward the demarc from the customer equipment is carried over the T lead and the R lead. Audio transmission from the demarc toward the customer is over the T1 lead and the R1 lead.

A side equipment sends signals on the M lead and receives signals on the E lead. B side equipment sends signals on the E lead and receives signals on the M lead.

Figure 33. 4 Wire, Type IB or Type VB Cross Connections with AG 2000 E&M Board as B Side Equipment

7.4.5 4 Wire, Type IA or Type VA Cross Connections

The 4 wire with E&M interface consists of six conductor leads (or three pairs), as shown in Figure 33. Audio transmission toward the demarc from the customer equipment is carried over the T lead and the R lead. Audio transmission from the demarc toward the customer is over the T1 lead and the R1 lead.

A side equipment sends signals on the M lead and receives signals on the E lead. B side equipment sends signals on the E lead and receives signals on the M lead.

Figure 34. 4 Wire, Type IA or Type VA Cross Connections with AG 2000 E&M Board as A Side Equipment

7.5 Editing the AG Configuration File

Refer to Chapter 3 for detailed information about editing the AG configuration file. The following sections provide information that is specific to the AG 2000 E&M board.

7.5.1 Naming Conventions for QSLAC Files

For detailed information about QSLAC files, refer to Section 3.3.10, QSLAC Files.

All QSLAC files have an extension of .slc. All QSLAC files adhere to the following naming convention:

[pp][cty][ss][i].slc
Where...

Represents the...

pp

Two-position NMS product field:

a2 = AG 2000 board

q3 = QX 2000/80-4L

q4 = QX 2000/100-4L

w8 = WTI-8 board

cty

Three-position ISO country code or region code.

ss

Two-position signaling type:

2w = 2 wire E&M

4w = 4 wire E&M

i

One position line impedance field:

6 = 600 ohm

For example, a2usa4w6.slc represents the AG 2000 board/USA/E&M, 4 wire trunk/600 ohm line QSLAC file.

The system automatically loads the correct E&M QSLAC file and cannot be changed.

For more information about QSLAC files, refer to the AG CAS for Natural Call Control Installation and Developer's Manual.

If the default file is not used, an entry will be made in the error log file at boot time. If echo cancellation is enabled, there is no benefit in changing from the default QSLAC file.

7.5.2 QSLAC Files and TCPs for E&M

The following table lists the QSLAC files for E&M which may be selected for the United States:
File

Description

a2usa2w6.slc

This is the default file that is used for 600 ohm optimization for 2 wire E&M.

a2usa4w6.slc

This is the default file that is used for all 4 wire E&M.


The following table lists the TCPs that are applicable to the AG 2000 E&M boards:
Trunk Control Program

Description

wnk1.tcp

E&M bi-directional wink start protocol.

wnk0.tcp

E&M bi-directional wink start protocol.

nocc.tcp

No call control.

7.6 Sample AG Configuration Files

7.6.1 AG 2000 E&M Without H.100 Connectivity

The following sample AG configuration file describes one AG 2000 E&M board using an E&M protocol, without H.100 connectivity:

[AGBOARD]

#---------- COMMON section --------

  TCP = nocc.tcp       # no call control protocol
  TCP = wnk1.tcp       # E&M protocol

  AG2DspFile = tone.m54       # Beep, tone generation, dial
  AG2DspFile = callp.m54       # Call Progress detection
  AG2DspFile = signal.m54       # Out-of-band channel associated
signaling
AG2DspFile = dtmf.m54 # DTMF and silence/energy detectors AG2DspFile = voice.m54 # NMS ADPCM play and record AG2DspFile = ptf.m54 # Cleardown and precise tone detection RunFile = AG2000.cor RunModule = gtp.leo RunModule = svc.leo RunModule = voice.leo ClockRef = OSC EnableMvip = No IdleCode = mu-LAW #--------- BOARDS section ---------- Board 0 PCIBUS = 0 PCISLOT = 19 End Board

7.6.2 AG 2000 E&M With H.100 Connectivity

The following sample AG configuration file describes one AG 2000 E&M board using and E&M protocol with H.100 connectivity:

[AGBOARD]
#------------ COMMON section ---------
AG2DspFile = voice.m54 AG2DspFile = signal.m54 AG2DspFile = dtmf.m54 AG2DspFile = callp.m54 AG2DspFile = tone.m54 AG2DspFile = ptf.m54 TCP = nocc.tcp TCP = wnk1.tcp RunFile = AG2000.cor RunModule = gtp.leo RunModule = svc.leo RunModule = voice.leo IdleCode = MU-LAW EnableMvip = YES #--------- BOARDS section --------- Board 0 PCIBUS = 0 PCISLOT = 19 ClockRef = H100 #take the clock from the bus or =OSC be the
clock master
End Board

7.7 Verifying the Installation

7.7.1 Using ctatest With an AG 2000 E&M Board

For testing purposes, configure port 1 for 2w Type IA and configure port 2 for 2w Type IB. Connect the E leads, the M leads, and the tip and ring lines of the two ports together. Ensure that the external power connector is connected to a -48 VDC power supply (refer to Figure 14 in Section 2.7.1, Using 2 Wire Interfaces).

To use ctatest:

  1. Make sure that the ag.cfg file includes the following statement for the board that you will be using:

    
    TCP = wnk0.tcp
    If necessary, edit the ag.cfg file and re-start agmon.
  2. Start ctatest as described in Section 4.5 for port 1 and for port 2.

    
    The initial ctatest menu appears.
    Note: Perform steps 3, 4, and 5 for port 1 and for port 2.
  3. Enter OP to create a CTA context and open the ADI service.

    
    CTAEVN_OPEN_SERVICES_DONE is displayed on your screen.
  4. Start a protocol by entering SP.

    
    The following message appears:
    Enter protocol name ['nocc']:
  5. Enter the E&M protocol: wnko.

    
    The following message appears:
    Event: ADIEVN_STARTPROTOCOL_DONE, Finished
  6. From port 1, type PC for "Place Call".

    
    The following message appears:
    Enter digits to dial `123'
  7. Press Enter.

    
    The following message appears for port 1:
    Event: ADIEVN_PLACING_CALL
    The following message appears for port 2:
    Event: ADIEVN_INCOMING_CALL
    Called number = `123'.
  8. Answer the call on port 2 by entering AC.

    
    The following message appears:
    Number of rings [1]:
  9. Press Enter to answer in one ring.

    
    The following message appears on port 1:
    Event: ADIEVN_CALL_CONNECTED, Answered
    The following message appears on port 2:
    Event: ADIEVN_ANSWERED_CALL
    Event: ADIEVN_CALL_CONNECTED
  10. You can then generate a DTMF tone from port 1 by entering GD.

    
    The following message appears:
    Enter DTMF string [`1234567890ABCD*#']:
  11. Type 1 and press Enter.

    
    The following message appears on port 2:
    Event: ADIEVN_DIGIT_BEGIN, `1'
    Event: ADIEVN_DIGIT_END
  12. Quit the test programs by entering Q for port 1 and port 2.

7.8 E&M Trunk Interface Signaling Bits

There are no dependencies between E&M transmit signaling and E&M receive signaling.

7.8.1 E&M Transmit Signaling

Figure 35 shows transmit signaling for E&M line interfaces:

Figure 35. E&M Transmit Signaling


This table summarizes the transmit signaling for E&M line interfaces:
Bit

Hex Bitmask

Description

A bit

0x08

Signaling relay

Value Description

0 On-hook

0x08 Off-hook

B bit

N/A

Set to 0.

C bit

N/A

Reserved.

D bit

N/A

Reserved.

7.8.2 E&M Receive Signaling

Figure 36 shows receive signaling for E&M line interfaces:

Figure 36. E&M Receive Signaling


This table summarizes the receive signaling for E&M line interfaces:
Bit

Hex Bitmask

Description

A bit

0x08

Current detector

Value Description

0 Detect on-hook

0x08 Detect off-hook

B bit

0x04

Same as A bit.

C bit

N/A

Reserved.

D bit

N/A

Reserved.

7.9 Hardware Specifications

7.9.1 Common Specifications
Specification

E&M Line Interface Type

Connectors

Board: 1 62 pin D type subminiature connector.

Cable: RJ 21 (standard 25 pin interface)

Return loss (ref. 600 Ohms +2.2 uF standard)

20 dB min. (ERL) for 2 wire

4 to 2 wire gain Tolerance

+/- 1 dB

4 to 2 wire gain range

+6 to -6 dB

2 to 4 wire gain Tolerance

+/- 1 dB

2 to 4 wire gain range

+6 to -6 dB

Frequency response
300 Hz - 3200 Hz. Reference to 1 kHz

+/- 1.2 dB

Trans-hybrid loss @ 1 kHz

17 dB min. for 2 wire

>40 db min. 4 wire

Signal overload level

+3 dBm at 0 dB gain

CMRR

> 80 dB

T-R input impedance
(300 - 3200 Hz)

Voice band 600 ohms +2.2 uF standard

Idle channel noise through connection

< 20 dB rnC

Crosstalk transmit to receive channels

< -62 dB @ 1 kHz

T-R isolation to SELV

>1000VRMS

Off-hook detect

Guaranteed Detect
Current > 10 mA

Guaranteed No Detect
Current < 2.2 mA

Operating loop current

18 mA to 70 mA

Maximum cable distance

4 wire: 3,000 feet (900 m)

2 wire: 1,000 feet (300 m)

7.9.2 Compliance

Natural MicroSystems obtains board-level approvals certificates for supported countries. In some countries you will require, in addition to the approval obtained by NMS for the board and its associated software, a system level approval before connecting the system to the public network. To learn what approvals you require, contact the appropriate regulatory authority in the target country.

Refer to the NMS web site for a list of countries for which NMS has obtained approval for the AG 2000 board.

EMC
US and Canada

FCC Part 15, Subpart J

· AG2000-LS: Class B (with unshielded cables and a ferrite block)

· All other AG 2000 boards: Class A (with unshielded cables)

EU countries

EN55022 (1994 + Amendment 1)

· AG 2000-8LS and 4LS: Class B (with unshielded cable and ferrite block)

· All other AG 2000 boards: Class A (with unshielded cable)

EN50082-1 (1992)

Australia

AS/NZS 3548

Other countries

Refer to the NMS web site (http://www.nmss.com).

Safety
US and Canada

NRTL recognized to cUL (UL 1950, 3rd edition)

EU countries

EN60950 (1992) + Amendments 1 to 4

Australia

ACA TS001 (1997)

Other countries

Refer to the NMS web site (http://www.nmss.com).

Telecom
US

FCC Part 68

Canada

ISC CS-03

EU countries

4 and 8 loop start interfaces

CTR-21 approved

4 loop start interfaces/4 NMS Fusion ports

CTR-21 approved

4 loop start/4 subscriber loop interfaces

TBR-21 compliant

Australia

TS002 (1997), TS004 (1997)

Japan

JATE blue book

Other countries

Refer to the NMS web site (http://www.nmss.com).

This is a Class A product. In a domestic environment, this product may cause radio interference. The user may be required to take adequate measures.



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