| Bhumika
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
| 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.
