General QuestionsWhat is a T1 or E1?
T1 and E1 refer to telephone trunks that carry digitized voice in Time Domain Multiplexed (TDM) channels. T1 based interfaces are pre-dominantly used in USA. Each T1 has 24 voice ports.
E1 based interfaces are pre-dominantly used in Europe, Asia and Latin America. Each E1 has 30 voice ports.
One voice port equates to one phone call.
What is an ISDN PRI?
T1 ISDN PRI refers to a T1 based trunk that uses 23 bearer time slots and 1 signaling time slot. It is also popularly referred to as 23B + D.
E1 ISDN PRI refers to an E1 based trunk that uses 30 bearer time slots and 1 signaling time slot. It is also popularly referred to as 30B + D.
What is a VoIP/SIP trunk?
Voice over IP refers to carriage of voice calls over the Internet. Session Initiation Protocol (SIP) is a signaling protocol that is used for setting up VoIP connections. The VoIP/SIP trunk operates over a standard Ethernet interface.
What interfaces does USN support?
USN supports the following TDM interfaces:
- T1 ISDN PRI
- T1 E&M Wink Start
- E1 ISDN PRI
- E1 R2MF
USN supports the following Voice over IP interface:
- VoIP/SIP over Ethernet.
- H.323 over Ethernet
What is the capacity of a USN?
A USN can handle up to 16 T1 or E1 trunks per chassis. That equates to 384/480 voice channels. The available voice channels can enter/exit the system either over T1/E1 lines or over VoIP Ethernet interface or shared between the two. For example, following configurations are possible:
- 384 T1 TDM ports and 0 VoIP ports
- 480 E1 TDM ports and 0 VoIP ports
- 0 TDM ports and 480 VoIP ports
- 240 E1TDM ports and 240 VoIP ports
What is the incremental capacity of a system?
- For systems equipped with T1 and VoIP interfaces, the port capacity can be increased from 24 to 384 in increments of 24. This applies to both TDM and VoIP capacity.
- For systems equipped with E1 and VoIP interfaces, the port capacity can be increased from 30 to 480 in increments of 30. This applies to both TDM and VoIP capacity.
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