Voice Interface Card Installation

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

Function&Feature

Installing Procession

Interface

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 MP-MLQ/ACELP at 6.3/5.3 kbps,

G.729/Annex A CS-ACELP at 8.0 kbps,

G.727 E-ADPCM at 16 to 40 kbps,

G.726 ADPCM at 16 to40 kbps,

G.711 PCM at 64 kbps. NetCoder at 6.4 to 9.6kbps。

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

4.        Support G.168 Echo counteract protocol

5.        TIA 464B DTMF test and produce

6.        VAD/CNG(Silence Suppression):

G.729 B for G.729A coders, and G.723.1A for G.723.1coders

High Grade proprietary for G.711, G.726/727 &NetCoder

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

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

Installing procession

Note:The voice interface card does not support hot swap for avoidingdamage the interface cards, so you should power OFF the router and disconnect the cable before installing/dismounting the interface card .

The steps of installing the voice interface card:

1.Power OFF.

2.Press the voice interface card into the slot in the rack and tighten the screws of the voice interface card.

3.Connect the cable to voice interface card and power ON.

4.If it necessary to change the voice interface card .Please react as step1-3.

Interface

The voice interface card of the router includs three kinds:FXS,FXO and E&M. They can connect telephone ,PBX  loop out relay and interface of PSTN analog user.As the follows:

picture2

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 evry user.

B . The digital exchange network can only transfer 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 recognition, counting and Ringing flaw control.

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

2.      Line performance:

A.       Ring impendance: Z interface of the users according to the nation standard.

B.       The terminal          200ohm+(560ohm/0.1uF)

C.       LAN computer         200ohm+(680ohm/0.1uF)

D.       Terminal impedance balanced return lose (TBRL) is no lower than 16Db within the zone (300~3400Hz).

E.        Max of Ringing flaw is not lower than      100V

F.        The frequency of Ringing flaw           25Hz

G.       Type of the choosing signal       DTMF(double voice frequency)

H.       Type of signal command            Chinese1 signal command(CAS)

I.          Voltage of battery Feed                >-24V

J.          Interface               RJ-11 connector(3 pinàRING 4 pinàTIP)

K.      Dial voice                   450Hz

L.        Answer voice                 450Hz1 second pass,4 second stop

M.     Busy voice                450Hz1 second pass,1second stop

N.      Ringing performance           1second pass,4second stop

3.        Lugs:

The standard RJ11 connector(see figure 3)

figure3: RJ11 cable

RJ11

Pin

Signal

1

-

2

-

3

Ring

4

Tip

5

-

6

-

table1RJ11

4.   FXS panel lamp

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 4:

 

picture4  rear panel of FXS network interface card

FXO interface

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

1.   Performance:

A.Control treatment including bell stream detection, pickup and hang up the telephone, dial-up and etc…

B.       The exchange of analog signal and digital voice signal

C.       Impendance and 2/4 hybrid

D.       Line protection

2.   FXO lug

FXO lug uses standard RJ11 connector 

picture5 RJ11 cable

RJ11

Pin

Signal

1

-

2

-

3

Ring

4

Tip

5

-

6

-

table2 RJ11 pin

3.    FXO panel lamp

        show as pictuer6

There are two lamp on every port of FXO rear panel:

Ring——call indicator lamp, indicates weather there is calling.

Use—— state indicator lamp, indicates the state of the port.

 

picture6 rear panel of FXO network interface card

 

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 curent , bring from the relay to (CO)to the user;2-line current supplies full flex voice channel.

2. Line performance:

A. Line  impendance : 600M

B. The max current of E line: 40mA

C. M line index: impendance--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

piture7 RJ45 cable

RJ45:

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 output/input)
6
T(4line:voice input;2line:no use)
7
E-lead
8
SG

table3 RJ45

 

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 signal unit and relay of type I must touch ground.

The direct “grounded connection” between D-Link device and PBX is very important, or it will easily generate E&M signal break and continuation.

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

 

picture8  E&M rear panel