Ring Generator Unit (Rgu); Modem Unit (Modu) - STARPLUS Triad 1 Product Description Manual

10-28
Chapter 10 - Triad 1/2 System Configuration

Ring Generator Unit (RGU)

The RGU provides the ring voltages to the SLIB circuits to ring the SLTs. Also, the RGU
provides the input to the Message Wait source on the SLIBs. The output of the RGU is 90V AC,
20Hz or 25Hz. There are two versions of the RGU, internal and external. The internal RGU can
support up to two SLIB boards. For three or more SLIBs, the external RGU must be used.
Wiring / Pinouts / Connections -- The RGU is mounted inside of the BKSU and connect via a
wiring harness.

Modem Unit (MODU)

The MODU provides an asynchronous modem for access to the system database and fault
reporting features from a remote site. The Module is optionally installed on the MPB and
incorporates a 2400 Baud modem. The modem may be connected to a pre-selected CO Line
through the system switching matrix. The local port may be connected to any CO Line via an
external modem or to a terminal. The MODU port is independent of the SIU standard RS232C
port, allowing system database access, etc. without the need to interrupt the SMDR output.
Figure 10-27: RGU (Ring Generator Unit)
Figure 10-28: MODU (Modem Unit)
Optional Units