Programming instructions

108
3300 ICP Technician’s Handbook
Calculating DSP Usage (CX/CXi)
Table 7: CX/CXi DSP Configurations
Base System
(2 total)
Base + T1/E1
Combo
(3 total)
Base + Dual
DSP
(4 total)
Base + T1/E1
Combo + Dual DSP
(5 total)
3 3-party conf.
4 voice mail ports
0 G.729a channels
24 IP phones
8 ONS phones
12 LS/CLASS
trunks
10 3-party conf.
16 voice mail ports
0 G.729a channels
64 IP phones
8 ONS phones
12 LS/CLASS
trunks
24 T1 trunks
10 3-party conf.
16 voice mail ports
0 G.729a channels
40 IP phones
8 ONS phones
12 LS/CLASS
trunks
10 3-party conf.
16 voice mail ports
16 G.729a channels
64 IP phones
8 ONS phones
12 LS/CLASS trunks
24 T1 trunks
3 3-party conf.
4 voice mail ports
8 G.729a channels
40 IP phones
8 ONS phones
12 LS/CLASS
trunks
Notes:
1. The number of conference, voice mail, and compression resources is fixed by
the purchased option and the number of DSP devices available; the other
values are adjustable. Compression alters the number of resources available
for the system. For example, by adding 8 compression resources to a system
with 4 DSPs total, the maximum number of three-party conferences drops to 3
and the maximum number of voice mail ports drops to 4.
2. The controller supports the G.711 and G.729a audio codecs.
- The G.711 PCM audio codec for 56/64 kbps generally provides the best
voice quality and is comparable to TDM-type connections.
- The G.729a audio codec for 8/13 kbps provides a good reduction in
bandwidth with only minor loss in voice quality.
- A purchasable MOSS option (Option 120, Number of Compression
Resources) controls the number of G.729a codecs available to IP devices in
the system. Compression enables more devices to share the available
bandwidth. The option is purchasable in multiples of 8 to a maximum of 16.
The default value is 0. The quantity entered must exactly match the quantity
on the MOSS sheet.
3. A hard drive is strongly recommended for systems that have more than eight
voice mail ports or when Record a Call is frequently used.
4. The base CX contains an Analog Main Board (AMB) that supports 4 ONS and
6 LS circuits. By installing an Analog Option Board (AOB), capacity doubles to
8 ONS and 12 LS circuits. The AOB does not require extra DSP resources.