E1/T1 Monitoring Probes
Corelatus E1/T1 probes extract signalling or voice data from E1 and T1 G.703 PCM links (2 or 1.5Mbit/s) in fixed, GSM and 3G UMTS mobile telephone networks. The probe connects to E1/T1 links, decodes layer 1 and layer 2 of the protocol stack, timestamps and then forwards the monitored data to an external server over TCP/IP.
Probes are permanently installed in the SS7 network, on GSM Gb, Abis, A, C, D, E and F links and on 3G Iub, Iucs and Iups links. The monitored data can be used for real-time billing, fraud detection and network supervision. It can also be used to create new services, for instance SMS welcome.
Radio Access Network E1/T1 Monitoring Probe
The Corelatus Radio Access Network Probe is designed to provide low cost monitoring of 3G Iub and GSM Abis links.
Radio Access Network E1/T1 Monitoring Probe Datasheet (PDF)
Hardware Features:
- Dual 48VDC power inputs
- Dual 10/100Mbit/s ethernet, both can use Power over Ethernet (PoE)
- Low power consumption (typical: 6W)
- No moving parts
- 19" rack mount, 1U high, 144mm (6" ) deep
- 64 E1/T1 receivers, i.e. capable of monitoring both directions of 32 E1/T1 links.
- E1/T1 inputs are compatible with -20dB and -30dB protected monitor points (ITU-T G.772) for non-intrusive monitoring and normal, unattenuated E1/T1 signals for connection to a MUX or DXC.
Layer 2 Signalling:
| Protocol | Capacity | Standards |
|---|---|---|
| 64kbit/s ISDN LAPD | 640 channels | ITU-T Q.921 |
| 16kbit/s ISDN LAPD | 768 channels | ITU-T Q.921 |
| ATM (AAL5, AAL2 and AAL0) | 32 channels, 64 Mbit/s | ITU-T I.361 ITU-T I.363.5 ITU-T I.363.2 ANSI T1.111.2A Bellcore/Telcordia GR-2878 |
Universal E1/T1 Monitoring Probe
The Universal E1/T1 Monitoring Probe connects to E1/T1 lines using the same interface as the Radio Acess Network probe, but provides a wider range of protocols. It can be connected to the GSM Gb, Abis, A, C, D, E and F links and on 3G Iub, Iucs and Iups links
Hardware Features
- Dual 48VDC power inputs
- Dual 10/100Mbit/s ethernet
- Low power consumption (typical: 27W per 1U chassis)
- No moving parts
- 19" rack mount, 1U high, up to 3 modules per chassis
- Configurations with 16, 32 or 48 E1/T1 receivers per 1U chassis, i.e. capable of monitoring both directions of 8, 16 or 24 E1/T1 links.
- E1/T1 inputs are compatible with -20dB and -30dB protected monitor points (ITU-T G.772) for non-intrusive monitoring and normal, unattenuated E1/T1 signals for connection to a MUX or DXC.
Layer 2 Signalling
| Protocol | Performance (per module) | Standards |
|---|---|---|
| ISDN LAPD | 72 channels | ITU-T Q.921 |
| SS7 MTP-2 (56/64 kbit/s) | 72 channels | ITU-T Q.703 ANSI T1.111.2 |
| SS7 MTP-2 (Nx64 kbit/s) | up to 72 channels up to 8Mbit/s |
ITU-T Q.703 Annex A ANSI T1.111.2 |
| Frame Relay | up to 64 channels up to 496 input timeslots |
ITU-T Q.922 |
| HSSL (ATM AAL5 based) | 6 channels, 12 Mbit/s | ITU-T I.361 ITU-T I.363.5 ANSI T1.111.2A Bellcore/Telcordia GR-2878 |
| ATM (AAL5, AAL2 and AAL0) | 6 channels, 12 Mbit/s | ITU-T I.361 ITU-T I.363.5 ITU-T I.363.2 |
In-band data access
For applications requiring unprocessed access to the data, for instance error analysis or voice quality measurements, the probe can forward the links to an external application without any L2 processing.
Data may be forwarded as separate 64kbit/s timeslots, or as a complete 2Mbit/s (1.5Mbit/s) span, using TCP/IP for the transport.
In-band signalling (DTMF, CAS MFC R2, SS5) can also be applied to voice timeslots.