Pots Connections; Pots Codec Setup For Multirack Compatibility; Using Multirack With Pots; Rate Drop Vs. Retrain - Comrex ACCESS MultiRack Product Manual

POTS CONNECTIONS

XIII.
MultiRack is capable of connections over modem links. This mode emulates the function of Comrex POTS (Plain
Old Telephone Service) codecs, which have been used for years to deliver high quality audio over standard, dial-up
telephone lines. This mode provides for a point-to-point connection between the codecs (i.e., no Internet where
MultiRack is used) and the call is placed directly from one MultiRack (or legacy codec) to the other.
POTS Mode is only supported on MultiRack instance #1.
Please note: Backward compatibility to Comrex Hotline codecs is not supported.
pots codec set-up For multIrAck compAtIbIlIty
Comrex legacy codecs (Matrix, Vector or BlueBox) must be configured for operation in Music Mode, which will
allow full-fidelity (up to 15 kHz) connections. Voice Mode is not supported by MultiRack. Contact closures and
ancillary data supported by legacy codecs are not supported by MultiRack.
MultiRack requires that outgoing POTS connections be defined on the Connections Tab. When defining any
outgoing connection, a profile must be assigned to it. For POTS Codec compatible connections, the factory default
POTS Profile should work best. Note: When creating a profile, designate the modem mode as POTS Codec rather
than POTS Stereo in order to be compatible with legacy devices (Figure 67).

usIng multIrAck wIth pots

To use MultiRack on POTS, a standard, analog telephone line must be connected to the rear panel's RJ-11
connector. If possible, obtain a true telephone-company-grade line. Under no circumstances should the raw
extension from a digital phone system be attached to this port—this will damage MultiRack, the phone system, or
both.
To initiate calls from MultiRack, simply create a remote connection with a telephone number as the address, rather
than an IP, in the Connections Tab. A POTS-based profile must be designated for this remote.

rAte drop Vs. retrAIn

When incoming or outgoing POTS calls are active, the Connections Tab changes slightly. There will be two additional
buttons that appear on the tab: Retrain and Rate Drop. These are special functions applicable only to POTS calls,
and are not visible during IP connections.
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