E1,
Voice Compression (DCME)
Technical
Specifications
VCL-LD, E1
DCME Voice Compression Equipment provides 30, Toll-Quality, very clear and sharp, voice
channels using an 8:1 compression ratio (10:1 Compression Ratio without signaling channel)
, for long-distance telephony, in a bandwidth of 256 Kbps. |
 |
The
interface to the local PSTN network is ITU-T G.703, G.704 compliant E1 with signalling
support for R2, CAS (ABCD) Digital Signalling, PRI ISDN (Q.931), SS7 and C7 Signalling.
|
Digital Network (PSTN) Interface 2048
Kbps Telco - E1
| Number of E1
Interfaces |
1 |
| Maximum Number
of Voice Channels per E1 Interface |
30 |
| Conformity |
G.
703 |
| Frame Structure |
As per ITU-T
(CCITT) G.704 |
| PCM Sampling
Rate |
8000 samples /
sec. |
| Encoding Law |
A law as per
ITU (CCITT) G.711 |
| Bit Rate |
2048 Kbps ± 50
ppm |
| Code |
HDB3 |
| Nominal
Impedance |
120 W Balanced (75 W Unbalanced* - Optional) |
| 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 |
6 dB at 1 MHz |
| 2048KHz to 3072
KHz |
>14dB |
| Jitter
Tolerance |
As per ITU
(CCITT) G.823 |
| Supported
Signaling |
Channel
Associated Signaling, R2 Signaling PRI (Primary Rate) ISDN Signaling (Q.931), C7 and SS7
Signaling. |
Clock Synchronization
| Synchronization
Sources |
Internal Clock
or Time derived from the E1, HDB3 link (Loop Timed Clock) |
| Default Option |
Internal Clock |
Digital
Carrier Interface 256Kbps (Fractional E1)
Compressed - E1
| Number
of E1 Interfaces |
1,
Fractional E1 Interface @ 256Kbps |
| Number
of DS-0's |
4 (First
Four Time Slots) |
| Conformity |
G.703 |
| Frame
Structure |
G.704 |
| Bit
Rate |
2048
Kbps ± 50 ppm |
| Code |
HDB3 |
| Nominal
Impedance |
120 W Balanced (75 W Unbalanced - Optional) |
| 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 |
6
dB at 1 MHz |
Return
Loss at:
51.2 KHz to 102.4 KHz
102.4 KHz to 2048 KHz
2048KHz to 3072 KHz |
>12dB
>18dB
>14dB |
| Jitter
Tolerance |
As
per ITU (CCITT) G.823 |
Power
Supply
| Input DC voltage |
-48V DC (nominal) |
| Range of input |
-40V to -60V DC |
| Power Consumption
|
Less than 20 Watts (at full load) |
| -48V DC input Voltage Reversal
Protection |
Provided Standard |
93V AC -267V AC, 47Hz-63Hz,
Auto Sensing |
Optional (External Supply) |
Echo Canceller
Technical Specification
| Provides voice echo cancellation of up to
128ms |
| Conforms to ITU-T G.165 and ITU-T G.168 |
| G.164 / G.165 disable tone detection |
| Non-Linear Processor with Comfort Noise
Insertion |
| Narrow-Band Detector |
| Eliminates long echo tail. |
Environmental
| Cooling |
Natural, Convection cooling |
| Temperature |
0°C to 50°C, Ambient |
Mechanical
Dimensions
| Rack Mounting |
Standard 19 inch DIN rack |
| Height |
3U, (133.35 mm) |
| Depth |
292 mm |
| Width |
482 mm |
| Weight |
8.50
Kgs. |
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Technical specifications are subject to change without
notice.
All brand names and trademarks are the property of their respective owners.
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