Government Requirements And Equipment Return; Multiport Backup; Synchronous Data Compression; United States - Paradyne COMSPHERE 3920Plus Technical Reference Manual

COMSPHERE 392xPlus Modems

Multiport Backup

When the 392xPlus multiport modem has the MUX Mode configuration option set to either
TDM/MSD or DTE Bridge, it is in Multiport mode, and either dial lines or a 2-wire leased line can
be used to back up the primary 4-wire leased line. Backup can be performed automatically upon
loss of the primary leased line, and automatic dial standby also can be used to automatically return
the modems to the primary leased line when restored.
When you use backup functions while in Multiport mode, the modem's automode feature is forced
to Disable. This ensures that the mux is not accidentally disabled by answering a call, which is
using modulation where Multiport mode is not supported. It is important that both modems
participating in the backup are in Multiport mode with the same dial-line modulation.

Synchronous Data Compression

The 392xPlus standalone and carrier-mounted modems are available with Synchronous Data
Compression (SDC). Refer to Appendix H,

Government Requirements and Equipment Return

Certain governments require that instructions pertaining to modem connection to the public
switched telephone network be included in the installation and operation manual. Specific
instructions are listed in the following sections.

United States

NOTICE TO USERS OF THE PUBLIC SWITCHED TELEPHONE NETWORK
1-10
When a 2400 V.34 modulation connection occurs on one end of a
modem pair with configuration options set for Asymmetric rates, the
other modem is 24K due to the 2400 symbol rate it uses.
1. This equipment complies with Part 68 of the FCC rules. On the equipment is a label that
contains, among other information, the FCC registration number and ringer equivalence
number (REN) for this equipment. The label is located on the bottom of the
Model 3920Plus modem and on the modem's circuit card assembly on the
Model 3921Plus. If requested, this information must be provided to the telephone
company.
2. Page A of this manual contains the Universal Service Order Codes (USOC) associated with
the services on which the equipment is to be connected.
3. An FCC compliant telephone cord and modular plug is provided with this equipment. This
equipment is designed to be connected to the telephone network or premises wiring using a
compatible modular jack which is Part 68 compliant. See Installation Instructions for
details.
NOTE
Synchronous Data
October 1998
Compression, for more information.
3920-A2-GH30-40