Multitech MMH956K Product Update

Multi-tech multimux mmh956k modems: install guide

Model MMH956K/MMV1656K

56K Internal DSU Upgrade Kit

Product Update

PN S000339A

4/02/04

This Product Update covers installing an internal 56K DSU in the MultiMux MMH900 series or the MMV1600/

3200 series. The first procedure covers installing the DSU in an MMH900 series and the second procedure

covers installing the DSU in an MMV1600/3200 series.

MMH900 Series DSU Upgrade Procedure

Step

Procedure

Check the contents of your upgrade kit to ensure that it contains the parts listed below:

a) Screwdriver

b) Mounting screws (2)

c) MMH956K DSU

d) Serial tag label

Turn the MultiMux power switch to OFF and unplug the MultiMux power cord from the wall outlet.

Turn the MultiMux upsidedown and remove the four screws securing the cover to the base.

Slide the cover off the base.

Plug in the Internal 56K DSU to the connector on the motherboard and the back 6-pins on the side 10-

pin connector. Be careful to align the 6-pins of the DSU with the pins on the 10-pin connector that

are the farthest from the modem 96-pin connector.

MMH900 Cover

Base

Table of Contents

Do you have a question about the MMH956K and is the answer not in the manual?

Page 1 Check the contents of your upgrade kit to ensure that it contains the parts listed below: a) Screwdriver b) Mounting screws (2) c) MMH956K DSU d) Serial tag label Turn the MultiMux power switch to OFF and unplug the MultiMux power cord from the wall outlet.
Page 2 Secure the DSU to the base using the two plastic mounting screws provided in the upgrade kit. One of the screws goes into the connector and the other one into the standoff on the motherboard. Set switch position 2 of the 8-position DIP-switch to the OPEN (UP) position. Slide the cover onto the base and replace the four cover screws.
Page 3 10 If the Voice/Fax board is in the chassis, remove the ribbon cable between the Aggregate board and the Voice/Fax board. 11 Remove the Aggregate board from the chassis. 12 Plug the DSU into either link A or link B on the Aggregate board being careful to align the 4-pin connector with the receptacle on the mother board.
Page 4 19 Ensure that the boards are seated into the back panel. 20 Ensure that the pc board chassis locks will seat into the boards. Then loosen, pry down and retighten the screws. WARNING: Ensure that the power cable connector pins align with the connector on the power supply board and that the power cable connector has the locking notch facing upward.

Mmv1656k