Specifications

Reference Guide
2-5
Applications Voice Modules and Applications
2.3.4 Voice Channel Bank Application
This is the simplest application which can be used by a service provider. The integrated access
system is used in this configuration when one or more digital T1/E1 trunks are needed to
interface with analog PBXs or key systems at the customer premises. In the US, the
break-even point for bringing in a T1 trunk as opposed to multiple analog lines is typically 6
analog lines. A single integrated access system can be used to provision up to 62 analog POTS
lines (FXS, FXO, E&M) on digital Central Office switches as shown in Figure 2-1.
Figure 2-1. An IAD used as a Voice Channel Bank
This integrated access system can also be deployed in applications which do just the reverse
of voice channel banks. This is most likely to be found in wireless local loop applications in
which the wireless service provider may use a state-of-the-art wireless local loop. The output
of the wireless base station is normally a T1/E1. However, the existing PSTN may still have
analog switches. The integrated access system is used to convert from robbed-bit
signaling/CAS to analog trunks.
The voice channel bank platform can be upgraded to provide an array of additional services
just by adding application modules to the chassis. It comes with a built-in suite of testing and
diagnostics tools which enhance the service and support capabilities significantly.
POTS/
CLASS
D
S
X
P
A
N
E
L
Local Digital Switch
Customer Premise
Central Office
Max 8 T1/E1
IAD
• 62 POTS/CLASS Lines