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Technical
Specifications:
VCL-CB-INT / VCL-CB-BR
Intelligent E1 Channel Banks
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 -³12dB
600Hz - 3400Hz - ³15 dB |
| Longitudinal Balance |
³ 46dB between 300Hz
to 3400Hz |
| Ring frequency detection |
25Hz and 20 Hz |
| Ring voltage detection |
³30 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
|
0°C to 50°C, 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:
VoIP SS7 and C7 Solution
E1 VOIP-GSM Gateway
GSM Gateways / GSM Channel Banks
Echo Cancellers
Digital Access Cross Connect Switch (DACS)
Groomers (Hi-Z Non-Instrusive Monitoring)
Multiplexers
Technical specifications are subject to
change without notice.
All brand names and trademarks are the property of their respective owners.
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