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Appendix H: ASU background information

This appendix provides background information on application-specific units (ASU) and the SuperNode platforms that support these ASUs.

Application-specific units and supported services

The following ASUs are described in this section:

link interface unit (LIU7)

Ethernet interface unit (EIU)

frame relay interface unit (FRIU)

X.25/X.75 link interface unit (XLIU)

network interface unit (NIU)

voice processing unit (VPU)

application processor unit (APU)

Link interface unit

The link interface unit (LIU7) provides an interface for common channel signaling 7 (CCS7). CCS7 supports a variety of services, including the following:

integrated user services part (ISUP) and connectionless (TCAP) -based services

enhanced 800 services (E800)

automated calling card system (ACCS)

custom local area signaling service (CLASS)

advanced intelligent network (AIN) services

Ethernet interface unit

The Ethernet interface unit (EIU) supports Ethernet connectivity on the DMS- 100 switch. The operating company can configure the EIU as either an IP or

DMS-100 Family EIU User Guide TELECOM12

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