AT&T System 85 Switched Requirements, Releases for Switched Applications, Switched Endpoints

DEFINITY High Speed Link

Switched Requirements

The following sections describe switched requirements.

Releases for Switched Applications

The switch releases which support the applications of the High Speed Link are:

System 75 R1V2 or later

System 85 R2V3 or later

DEFINITY G1, G2, and G3

All versions of the switch do not provide the same level of support. The biggest difference is in the type of network access arrangement that is supported.

Switched Endpoints

The Data Terminal Equipment (DTE) must be capable of communicating at 56 kbps or 64 kbps. Proper switched operation requires that the DTE supports a Data Terminal Ready (DTR) lead on its V.35 interface. The DTR lead provides the signal to the High Speed Link that it is ready to receive or originate a call. Before the High Speed Link can originate (dial) or answer a call, the DTR lead must be asserted (high) by the DTE. In addition, the DTE uses the DTR lead to signal the High Speed Link to drop a call. This is accomplished by turning off its DTR lead.

Switched Applications

Switched applications are applications using the switched network. ACCUNET Switched Digital Services (SDS) and Software Defined Data Network (SDDN) are examples of switched applica- tions. See Figure 2 for an example of a switched configuration. For additional information on switched applications, implementations, and administration, refer to the DEFINITY High Speed Link User’s Manual, 555-020-711, Appendix D: Applications and Switch Administration.

RS-366ideoV .35HRVSL366- DCP RSH -L366 G1

Network

DEFINITY G2SwitchedRSHL366- DCP .35HSLVV ideoDEFINITY

FIGURE 5-2. Switched Network Application

5-58