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E1 DCME - Voice Compression
Technical Specifications |
DescriptionValiant Communications' VCL-LD™ DCME, Voice
Compression Equipment provides 30, toll-quality voice channels using an 8:1 compression ratio, (10:1 without signaling channel) in a
bandwidth of 256kbps.
Also available with fax and data modem support @ 33.6Kbps
data rates. This is accomplished using an advanced digital signal processor (DSP) based
Virterbi decoder with automatic voice/silence detection (VAD) and adaptive comfort noise
generation (CNG).
The interface to the local PSTN Network is ITU-T, G.703,
G.704 compliant E1 with Signaling support for R2 CAS Digital Signaling, PRI ISDN
Signaling, C7 and SS7 Signaling. |
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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 - Option available on request |
| 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, SS7
Signaling |
Digital Carrier Interface
256Kbps (Fractional E1) Compressed - E1 (voice only application)
| Number of E1
Interfaces |
1, Fractional
E1 Interface @ 256Kbps |
| Number of DSO'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 - Option available on request |
| 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 |
Digital Carrier Interface
384Kbps (Fractional E1)
Compressed - E1 (voice, fax and data modem support @ up to 33.6Kbps transmission)
| Number of E1
Interfaces |
1, Fractional
E1 Interface @ 384Kbps |
| Number of DSO's |
6 (First Six
our 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 - Option available on request |
| 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 |
Clock Synchronization
| Synchronization
Sources |
Internal Clock
or Timing derived from the E1, HDB3 link (Loop-Timed Clock) |
| Default Option |
Internal Clock |
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) |
93VAC -267VAC, 47Hz-63Hz,
Auto Sensing |
Optional (External Power Supply) |
E1 Echo Canceller |
| Provides voice echo
cancellation of up to 128ms. |
| Conforms to ITU-T
G.165 and ITU-T G.168 specifications |
| G.164 / G.165 disable
tone detection |
| Non-Linear Processor
with Comfort Noise Insertion |
| Narrow-Band Detector |
| Eliminates long echo
tails |
Environmental
| Cooling |
Natural, Convection cooling |
| Temperature |
0°C to 50°C, Ambient |
Mechanical Specifications
| Rack Mounting |
Standard 19 inch DIN rack |
| Height |
3U (133.35 mm) |
| Depth |
260 mm |
| Width |
477 mm |
| Weight |
8.500 Kgs. |
Ordering
Information
Related Links
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