Rev G REF TEK 130 Multi-Channel Users Guide 5/14/2021
96223-00-UG
42 Reftek Systems Inc.
Operating the 130-MC with the SLM Modem
This section provides general procedures for setting up and operating the REF TEK 130-MC with
a SLM modem module
SLM Modem module
The SLM2456 modem module is used in the 130-Modem and as the internal modem for the 130-
MC. The SLM2456 is a complete, modem module that is based on the Si2456 chipset. The Si2456
is an ITU-V.90 compliant, 56 kbps modem chipset with integrated direct access arrangement (also
called DAA it includes parallel phone detect, over-current detection and global PTT compliance).
This provides a programmable line interface to meet global telephone line requirements. It is a
single design that includes a DSP data pump, a modem controller, on-chip RAM and ROM, an
analog front end (AFE) a DAA, and analog output.
The 130-8279 modem cable is used with the 130-MC when supplied with an internal modem.
Modem features
The SLM2456 accepts standard modem AT commands and provides connect rates up to
56/33.6/14.4 kbps full-duplex over the Public Switched Telephone Network (PTN). It also features
a complete set of modem protocols including all ITU-T standard formats up to 56 kbps.
Note: This material is part of the Silicon Laboratories® Si2456/33/14 data sheet document revision 1.0. See the
Si2456/33/14 Users Guide (“AN70:Si245/Si2433/Si2414/Si2403 Modem Designer’s Guide) for detailed feature
explanations.
Note: The internal modem requires the jumper installed on the RT580 lid board to assign the serial PPP port to the
internal modem and therefore disable the serial PPP port coming out of the NET connector.
SMCC Modem Configuration
The SMCC command and control program is a multi-platform REF TEK program for command-line
command and control of the 130-MC over a TCP/IP (LAN/WAN) connection through RTPD or
through a serial connection. SMCC is a client-server application that serves up HTML pages to
web browser clients.
The modem parameters section of the SMCC display is used to define up to 10 different time
windows in which an external modem is supplied power. Used to define the delay time between
turning on external power and trying to talk to the modem (regardless of whether it is an internal
or external modem). If the internal modem is used, or no modem is attached, the init string is
not sent.
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