iv
NOTE:
Before you replace a VPM, remove the SPU from the chassis. For information about removin
an SPU, see
"Replacing an SPU."
VPM (Voice Processing Module) functions to implement the encryption/decryption, EC and CNG of
voices. The following types of VPM modules are available on the MSR4000 routers:
256-channel voice processing module (256-VPM)
512-channel voice processing module (512-VPM)
Figure 40 VPM
Figure 41 SPU-200 structure
(1) Front panel (2)
VPM
To replace a VPM:
1. Pull the release latches away from the VPM at both ends so that the VPM springs up from the slot.
2. Holding the non-conductive edge, remove the VPM.
Keep the removed VPM for future use.
3. Align the polarization notch of a new VPM with the VPM slot on the main board and insert it into
the slot along the slide rails.
4. Carefully and firmly press the VPM at both ends until you hear a click. This indicates the VPM is
seated in the slot.
5. Verify that the release latches have firmly locked the VPM in position.
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