Programming instructions

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3300 ICP Technician’s Handbook
The result of this calculation gives a reasonable estimate of the number of
DSP devices and modules required to support the system configuration. If
the total number of DSP devices is very close to a Quad module boundary,
or if there are other issues with a complex system, contact Professional
Services for a detailed analysis of system resources and performance.
Voice mail notes:
• Program the additional voice mail ports, then add the DSP MMCs if
necessary (for the MXe, you need to add DSPs only for compression).
• With Release 5.0, voice mail ports support G.729a compression.
When you increase the number of ports you may also have to add
DSPs to handle the increased demand for compression.
Compression notes:
• Compression resources are assigned to the first DSP devices found
starting at the lowest-numbered available slot.
Table 6: Quad DSP Requirement Calculator (LX/MX
Basic Requirements 1.77 = 1.77
IP Lines × 0.0012 =
TDM Lines × 0.0025 =
IP networking (enter total users in
above equation, if IP networking is
enabled, otherwise enter zero)
× 0.002 =
FAX detection (Note 1) × 0.003 =
Voice Mail Ports: ÷ 15 =
Subtotal (Note 2) minimum = 4
Required telephony devices subtotal minus embedded
Compression Channels:
(round up result to next integer)
÷ 8 =
Total DSP Devices =
Quad DSP modules = Total DSP devices ÷ 4
(round up result to next integer)
Note 1. FAX detection only applied when IP trunks are active.
Note 2. Every system allocates a minimum of 4 DSP devices to telecom
applications.