Voice Interface Card Installation

This section introduces the performance, installation and connecting method of different voice interface card.

Function&Feature

Interface usage

FXS interface

FXO interface

E&M interface

The voice interface card transfers the voice signal into IP packet or frame form on the data network.The voice interface card supplies different kinds of interface to connect telephone equipment or network.The interface cards supplied now are :2-portFXS,2-portFXO,2-portE&M.They can be used on any slots of 1750/2620/2621 router, slot1/slot3 of 2630 router and slot1/slot4 of 2650router.

Picture1 voice interface card

 

Function&feature

1.      Supply  2-port full-flex voice channel.

2.     Support the following compressed voice number:

G.723.1 6.3/5.3 kbps,

G.729 AnnexA 8k,

G.727 32k 32k/40k,

G.726 32k 40k,

G.711 alaw 64k,

G.711 ulaw 64k

3.        Meet FRF.11 VoFR IA.voice frame form

4.        Support G.168 回波抵消协议

5.        TIA 464B DTMF test and produce  

VAD/CNG(Silence Suppression): G.729 B for G.729A coders,

G.723.1A for G.723.1 coders. High Grade proprietary for G.711,

G.726/727 &NetCoder;

6.        Supply FXS/FXO interfaces and so on.Easy to change.

7 .      Support to connect to many telephone equipment and PBX.

Interface usage

Voice module includes three interfaces: FXS,FXO,E&M and can connect to telephone and PSTN as following:

 
 

 

FXS interface

The interface locates between the user's line and digital exchange network to solve the problems between users and exchanging network.The terminal is CCITT Z port which can connect the telephone of the user and supply low-speed data connecting by Modem.

1.  Function:

A.       Battery Feed,Over Voltage Protection,Ringing,Supervision,Codec,2/4 Hybrid, Test of every user.

B .     The digital exchange network can only transmit TTL electrical digital signal and can not used for Battery Feed, Ringing, Supervision and Test ,so use the special cable (FXS interface).

C.       The common telephone line is double line and transfer the analog signal,so the users must use 2/4 line exchange and module/data exchange to connect the user's line and digital exchange network.

D.      The  interruption of thunder and eletricity  is possible because the line of analog user is very complex.. However the equipment used by the router is low voltage ,so the Over Voltage Protection should be added.

E.       Add the line management  for the line test.

F.       The concentration and  deconcentration  of traffic service .Above-line connects multi-terminal of the users and concentrated on the IP network.Below-line deconcentrates the voice flaw on the IP network to many terminals.

G.       Supply recognizability, counting and Ringing flaw control.

H.       Collect the signal of the users to supply the router choices.

 

There is one indicator lamp on evry port of the rear panel: In Use——State indicator lamp, indicates the port is using, show as picture :


FXO interface

The local call can be connect to PSTNor PBX on FXO interface which is supplied by a standard telephone.

1.   Performance:

A.     The control treatment including bell stream inspection, picking up and hanging up the telephone, dialing-up and etc…

B.       The transformation between analog signal and digital voice signal

C.      Impedance matching and 2/4 line transfer. Circuit protection

D.      Every port of FXO rear panel has two indicator lamp

E,      Use---- Mode indicator light, used to indicate the current interface mode.

As the following picture:
 

 

Cable

FXS/FXO interface uses standard RJ11 connector cable:

RJ11 pin:

Pin

Signal

1

-

2

-

3

Ring

4

Tip

5

-

6

-

Note :Do not connect FXS interface to PSTN directly.

Interface features

Entry

parameter

Loop impedance: according to the national standard of Z interface of the user

A User

B local-used equipment

 

 

 200ohm+(560ohm//0.1uF)

200ohm+(680ohm//0.1uF)

Terminal impedance balances circuit return loss

(TBRL) no less than 16dB within the zone (300~3400Hz)

The peak value of the bell stream is no less than

58V

Bell value frequency

25Hz

Select the signal type

DTMF (double audio frequency)

Command signal type

China No.1 command signal (Channel Associated Signaling CAS)

Dialing tone

450Hz

Answering tone

450Hz, communicate within 1 second, stop within 4 seconds

Busy tone

450Hz, communicate within 1 second, stop within 1 second

Flapping bell feature

communicate within 1 second, stop within 4 seconds

 

E&M interface

1. Function:

Analog relay line used to connect auto-system(such as,PBX)and network(such as,center office),The relay mode commonly used is E&M interface ,like serial port,E&M interface has DCE/DTE type.In communication, the relay is similar to DCE and used as CO.The E&M interface we designed is used at the interface side ,and the other  signal side, similar to DTE,is PBX.

The signal of E&M interface has five types of physical configuration (Types 1-5),The voice interface also has two types of interface signals(2/4 cable):

· E ("Ear" or "Earth") - the signal line from the relay (CO) to signal(user)

· M ("Mouth" or "Magnet") - the signal from the user  (user) to the relay (CO)

· SG ("Signal Ground") - use E&M type ,touch ground sometimes but sometimes not

· SB ("Signal Battery") - use E&M type ,touch ground and 48V sometimes but sometimes not

· T/R ("Tip/Ring") - only use on 4-line current with voice T1/R1("Tip-1/Ring-1") from the user to relay(CO)----- - 4 line circuit , bring from the relay to (CO)to the user;2-line current supplies full flex voice channel.

2. Line performance:

A. Line impedance: 600M

B. The max current of E line: 40mA

C. M line index: impedance :10Kohm            max current:40mA

D. Signal command type: Wink Start Delay Dial Immediate Start

E. E&M type: I、II、III、V

F. The type of traffic interface: 2/4 line, G. control signal: DTMF

3. Lug:

Use standard RJ45 connector as picture7

  RJ45 cable

RJ45 pin is as follows:

Pin

Signal

1

SB

2

M-lead

3

R(4line:voice input;2line:no use)

4

R or R1(4line:voice output;2line:voice input/output)

5

T or T1(4line:voice output;2line:voice outpput/input)

6

T(4line:voice input;2line:no use)

7

E-lead

8

SG

table3 RJ45pin

 

4. The compatibility problems of E&M signal unit and relay current terminal

E&M gives conception to every connecting between relay current and signal unit.D-Link analog E&M interface works at signal unit ,so consider another as relay .The two ends can be connected back-to-back by crossing the signal when E&M chooses II or V types and not when the E&M chooses Ior III types.The E&M relay of most PBX can work on relay current and signal unit.The relay configuration of PBX must be changed to work on the relay terminal because the D-Link analog E&M interface works on signal unit.Type I or III is the only method for PBX works with D-Link E&M interface. Some PBX equipments can only work with E&M signal unit of the interface . This means that if you choose I or III type of E&M interface it can not work with D-Link E&M interface but it can connect to D-Link E&M interface if you choose II or V type of E&M.

Every E&M type has only one model and connecting picture:

(1)、E&M type I interface model:

Note:

The two units can not be connected back-to-back .

The type I signal unit side and relay circuit side should all be grounded.

D-Link touch-grounged  equipment and PBX is very important ,or it is easy to interrupt the E&M signal.

The connecting of typeI& interface of 2 line uses 4 leads.

The connecting of typeI& interface of 4 line uses 6 leads.

 

(2)、E&M II interface model:

Note:

E&M interfaces can connect back-to-back by crossing the signal line.

The connecting of typeI& interface of 2 line uses 6 leads.

The connecting of typeI& interface of 4 line uses 8 leads.

 

(3)、E&M III interface model

Note:

The two sides can not connect back-to-back.

The connecting of typeIII& interface of 2 line uses 6 leads.

The connecting of typeIII& interface of 4 line uses 8 leads.

 

(4)、E&M V interface model:

Note:

Do not isolate ground when it uses typeV.

The two units can not be connected back-to-back .

The connecting of typeV& interface of 2 line uses 4 leads.

The connecting of typeV& interface of 4 line uses 6 leads.

 

The connecting of E&M interface is complex for the different socket connectors of PBX E&M interface.So the interface cable is not supplied. The connecting of E&M interface refers to" PBX Information".

 

5. E&M panel lamp

There is one indicator lamp of evry port on the E&M rear panel: In Use--state indicator lamp,used to indicate the port is using.

VIM-2E&M rear panel picture:

VIM-4E&M rear panel picture: