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|   E1 Analogue Channel Banks with Voice Detection    |

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Technical Specifications
 
Comarra intelligent E1 Channel Banks, with answer supervision and voice activated answer supervision. PRI ISDN (Euro ISDN) also available as an optional extra.

The VCL-CB-INT offers Voice Activity Detection (VAD) voice activated "answer supervision" and "disconnect supervision" to connect VoIP (Voice over IP),

Voice over Frame Relay and Voice over ATM networks to analog PSTN (POTS) lines that do not provide any type of answer supervision / battery reversal functions.

VCL-CB-BR provides provides answer supervision / battery reversal / polarity reversal support and is used in applications to deliver voice over an end-to-end E1 (radio / fiber / HDSL) links. Features include complete line protection against difficult field condition.

The interface to the analog PSTN (POTS*) lines have been ruggedized to provide complete protection against line card failures which occur from induced voltages from AC power lines and lightening strikes and difficult field conditions.

Analog Interfaces available

FXO interface cards - connect to the analog PSTN (telco) lines.
FXS interface cards - connect to analog telephone sets.
E&M interface cards - connect to E&M switches / interfaces.

Digital Interface 2.048 Mbps, E1 Interface

Number of E1 Interfaces 1
Conformity (Electrical)        G. 703
Frame Structure As per ITU (CCITT) G.704
Signaling R2 Digital (Channel Associated Signaling in accordance with ITU-I Q.421 / Q.422 Rec).

Optional: PRI ISDN (Q.931) Euro ISDN Signaling

PCM Sampling Rate 8000 samples/sec
Encoding Law A Law as per ITU (CCITT) G.823
Bit Rate 2048 Kbps 50 ppm
Code   HDB3
Nominal impedance 120 W balanced (75 W unbalanced - option on request)
Connector   RJ-45 (120 ohms impendence)
Peak Voltage of a mark
For 120
W Balanced interface
75
W Unbalanced interface   
3.0 V 0.3 V
2.37 V 0.237 (Optional)
Peak Voltage of a space
For 120
W Balanced interface  
75
W Unbalanced interface
0V 0.3V
0V 0.237 V
Nominal Pulse Width  244ns
Pulse Mask As per ITU (CCITT) Rec. G.703
Output Jitter <0.05 UI (in the frequency range of 20Hz to 100 Khz )
Permissible Attenuation 6dB at 1 MHz
Return Loss at:
51.2 Khz to 102.4 KHz       
102.4 Khz to 2048 Khz       
2048KHz to 3072KHz       
>12dB
>18dB
>14dB
Jitter Tolerance  As per ITU (CCITT) G.823
Loss and recovery of frame alignment : As per clause 3 of ITU (CCITT) G.732
Loss and recovery of multi frame alignment: As per clause 5.2 of ITU (CCITT) G.732

2 Wire , Analog PSTN Interface - POTS Interface

Maximum Number of Channels    30
Transmission performance  Fully compliant to ITU (CCITT) G.712 specifications
Line Impedance 600W (900W optional)
Connector RJ-11
Voice Channel Frequency 300Hz-3400Hz
Insertion Loss      -2dB Nominal (User adjustable range of -2dB to -7dB)
Idle Channel Noise -65dB
Return Loss  300 Hz - 600Hz -12dB
600Hz - 3400Hz -
15 dB
Longitudinal Balance 46dB between 300Hz to 3400Hz
Ring frequency detection 25Hz and 20 Hz
Ring voltage detection 30 volts RMS
Overload Level   +3.14 dBm 0.5 dBm
Data Transmission Supports V.34 modems
33.6Kbps (download data transmission rate)

Clock Synchronization

Synchronization Sources         Internal Clock or timing derived
From the E1 HDB3 link (Loop-Timed)
External Clock Input As per ITU (CCITT) Rec G.703
Default Option Internal Clock

Power Supply

Input DC voltage -48V DC (nominal)
Range of Input -40V to -60V DC
Input Voltage Reversal Protection Provided

Environmental

Cooling Natural, Convection cooling
Temperature                 0C to 50C, Ambient

Mechanical Specification

Rack Mounting  Standard 19 inch DIN rack
Height  3U (133.33 mm)
Depth    260 mm
Width 477 mm
Weight 7.50 Kgs.

Notes

FXO interface cards - connect to the analog PSTN (telco) lines.
FXS interface cards - connect to analog telephone sets.
E&M interface cards - connect to E&M switches / interfaces.

Others Links:

  Multiplexers
  STM SDH Multiplexers
  E1 VoIP-GSM Gateways
  VoIP SS7 and C7 Solution
  Echo Cancellers and VQE Solutions
  GSM Gateways / GSM Channel Banks
  E1 and T1 over Ethernet (TDM over IP)
  Digital Access Cross Connect Switch (DACS)
  E1, T1, E3, DS3, Ethernet Converter (IP over TDM)

Technical specifications are subject to change without notice.
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