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E1, DCME, Voice Compression Equipment provides 30, Toll-Quality, very clear and sharp,
voice channels using an 8:1 compression ratio, for long-distance telephony, in a bandwidth
of 256 Kbps. This is accomplished using an advanced, DSP based Viterbi decoder with
automatic Voice / Silence detection (VAD) and adaptive comfort noise (CNG) generation.
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
Interface 2048 Kbps |
| 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 |
| Signalling |
Channel
Associated Signalling, R2 Digital, PRI (Primary Rate) ISDN Signalling, SS7 Signalling |
| 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 |
|
Digital Carrier Interface
256Kbps (Fractional E1) |
| Number
of E1 Interfaces |
1, Fractional
E1 Interface @ 256Kbps |
| Number
of DSO's |
4 |
| Conformity |
G.703 |
| 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 Time Dericed Clock from the E1, HDB3 link (Loop Times Clock) |
| Default
Option |
Internal Clock |
|
Power
Supply |
| Input DC voltage |
-48V DC (nominal) |
| Range of input |
-40V to -60V DC |
| -48V DC input Voltage
Reversal Protection |
Provided Standard |
93VAC -267VAC, 47Hz-63Hz,
Auto Sensing |
Optional (External Supply) |
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Environmental |
| Cooling |
Natural, Convection cooling |
| Temperature |
0°C to 50°C, Ambient |
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Mechanical Specifications |
| Rack Mounting |
Standard 19 inch DIN rack |
| Height |
3U (133.33 mm) |
| Depth |
292 mm |
| Width |
482 mm |
| Weight |
8.5 Kgs. |
| Ordering Information |
| E1 Interface: DCME Carrier System |
For
Dedicated Point to Point Links
Part Number LD-0100 |
| E1 Interface: DCME Carrier System |
For
IP Transport (Powered by Cisco Routers)
Part Number LD-IP |
Related Links
E1, Digital Voice Compression
Equipment
E1, Digital Voice Compression Equipment -
Product Brochure (PDF)
E1, Analog Voice Compression (DCME)
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Technical
Specifications are subject to change without notice.
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