Encore Networks

Frequently Asked Questions - Signaling

1. What is the SignalPath™ Signaling Gateway?
The SignalPath™ Signaling Gateway is a line of advanced signaling protocol converters designed to resolve protocol incompatibilities that exist between communications networks. The combined product line, which includes the SP230, SP201, and SP201-SA products, can collectively handle conversions for SS7, C7, C5, PRI ISDN, NI2 ISDN, R1, R2, DTMF,and SGCP, as well as a large number of custom protocol variants.

2. What is the difference between in-band and out-of-band?
In-band signaling: A signaling method in which network control and call setup signals are sent over the same path as the user's transmission. With inband call setup signals occupying the communications pathway, transmission of the user message must wait until the call setup process is completed.

Out-of-band signaling: A signaling method in which network control and call setup signals are sent over a separate digital channel, called a signaling link. This method allows for the transport of more data at higher speeds since setup signals and transmission of user messages can be sent simultaneously.

3. What is the difference between the Signaling Gateway products?
The SP230 has a modular design, with a capacity of up to 52 E1 or T1 interfaces, allowing users to scale the product to fit small or large applications while incurring a low upfront investment. Depending on the software loaded on the card(s), it can handle conversions for SS7, C7, PRI ISDN, NI2 ISDN, CAS (R1, R2, DTMF), and SGCP.

The SP201 features a compact 1U height designed for budgeted space, with a capacity of up to 4 E1 or T1 interfaces on one Aggregate Card for the customer with low-end requirements. Depending on the software loaded on the one card, it can handle conversions for SS7, C7, PRI ISDN, NI2 ISDN, or CAS (R1, R2, DTMF).

The SP-201-SA is a very small, economical unit that provides one T1 or E1 trunk connection for protocol conversions between CAS (R1, R2, DTMF) and ETSI PRI ISDN or NI2 ISDN networks. It was developed specifically for PBX, IP-PBX, and video-conferencing applications.

4. Can different types of protocol conversions be mixed within a SignalPath product chassis?
The SP230 features this capability.

5. What is the difference between C7 and SS7 signaling?

  • C7 refers to the Signaling System No. 7 specified by ITU-T recommendations. 
  • For the Integrated Services User Part (ISUP), these recommendations are Q.767, Q.701- Q.704, Q.705, Q.708, Q.709, Q.780- Q.782, Q.784, and Q.788.
  • SS7 refers to the Signaling System No. 7 specified by BellCore TR-NWT-00264, ANSI T1.111a, T1.112, T1.113a, T1.114, T1.116, and T1.234-T1.236.

6. How many SS7 links can the SignalPath products support?

  • The SP230 supports up to 52 SS7 links per chassis.
  • The SP201 supportsup to 4 SS7 links per chassis.

7. How many T1 or E1 trunks can the SignalPath support?

  • The SP230 supports up to eight E1 or T1 trunks per Aggregate card, or up to 104 full duplex trunks, per chassis.
  • The SP201supports up to four E1 or T1 trunks, or eight full duplex trunks, per chassis.
  • The SP201-SA supports one T1 or one E1 trunk, bi-directionally.

8. How many channels (or DS0s) do the SignalPath products support?

  • The SP230 supports up to 248 channels per Aggregate Card (AGC), or up to 3,224 channels per chassis. Each chassis can contain up to 13 AGCs.
  • The SP201 supports up to 31 channels per trunk, or up to 248 channels per chassis.
  • The SP201-SA supports up to 30 channels per chassis.

9. Does the bearer traffic have to pass through the SignalPath?
This depends on the application. For an ANSI SS7 to ITU-T SS7 conversion, the bearer traffic needs to pass through the SignalPath 230 only if T1 to E1 rate conversion is required. For an R2 and PRI ISDN to SS7 conversion, the bearer traffic must pass through the SignalPath for the conversion to be properly handled.

10. What speed is the SS7 channel?
You can configure the SS7 channel for either 56 kbps (T1) or 64 kbps (E1).

11. How is the SS7 channel assigned? 
Can it be mapped to a port? You can configure the appearance of the SS7 channel on any one of the timeslots in the T1 link or in timeslots 1–31 in the E1 link using either the command console interface or the System Controller Module. Timeslot 0 is reserved for framing per G.703/704 ITU-T requirements.

12. Which country protocols are supported?
A complete list of country protocols and variants we support is available under Country List

13. Do I need to add additional modules to perform a T1 to E1 conversion?
No. T1 to E1 rate conversion is performed within the same modules that handle protocol conversion.

14. How do I provision the SignalPath?
You can perform system provisioning locally or remotely through the System Controller Module.

15. Does the SignalPath support redundancy?
The SP230 supports redundancy. You can order additional power supplies, alarm cards, provisioning System Controller cards, and signaling links to provide redundancy.

16. What is the lead time for ordering a SignalPath with a standard configuration?
The standard delivery is 30 days (typically less) ARO for an off-the-shelf product. If additional work is required to add a new protocol variant, the delivery timeframe increases proportionally to the amount of time required to implement the new variant. We can provide a firm delivery commitment upon review of the line and register signaling specifications for your specific application.

 
 
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