Specifications

Introduction 3
European public switched telephone networks while feature 3211 supports North
America and other geographies.
1.5.3 2-Port Analog E&M Voice CPCI Adapter (FC3312)
The 2212 E&M adapter supports inter-PBX tie trunk connections. It supports
E&M types 1, 2, and 5 in both normal and reverse modes with either a 2-wire or
4-wire electrical interface. Each port on the E&M adapter emulates E&M
transmission equipment to the attaching switch. The E&M adapter can be
configured for either immediate or wink start call processing operation. With
Immediate start, the E&M adapter transfers the registration information (dialed
digits/characters) to the Telco interface immediately after going off-hook. With
wink start call processing, the E&M adapter transfers the registration information
(dialed digits/characters) to the telco interface after the detection of a wink
condition.
1.6 Voice Compression Support
The IBM analog voice adapters provide the most advanced voice compression
technology in the industry. They use DSP algorithms from Nuera
Communications, and support the following vocoders: ITU standard algorithms
including ADPCM (G.726), LD-CELP (G.728) and CS-ACELP (G.729) Nuera’s
proprietary Enhanced-CELP (E-CELP) algorithms operating at 4.8, 7.47 and 9.6
kbps. E-CELP is based on a complex and patented approach that uses several
pararell paths of selection when looking up code matches. This enables the code
books to be larger and optimized for specific portions of the sampled signal.
Therefore, each voice frame has three code-book samples for the various parts of
the signal. This creates a high degree of correlation between the input signal and
the code-book samples. E-CELP, which is Nuera’s most popular and
highest-quality algorithm, has been demonstrated by independent analysis to be
the best compression algorithm available.
1.7 Competitive Comparisons
This section includes charts that compare the 2211 and the 9783 with devices
from other manufacturers.