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COMSPHERE 3821Plus Modem
E February 1998 3821-A2-GB20-30
Canada
Notice to Users of the Canadian Public Switched Telephone Network
The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets
certain telecommunications network protective, operational and safety requirements. The Department does not guarantee the equipment
will operate to the user’s satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local
telecommunications company. The equipment must also be installed using an acceptable method of connection. In some cases, the
company’s inside wiring associated with a single line individual service may be extended by means of a certified connector assembly
(telephone extension cord). The customer should be aware that compliance with the above conditions may not prevent degradation of
service in some situations.
Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs
or alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to
request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections of the power utility, telephone line and internal
metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas.
The Load Number for this equipment is listed on a label on the modem. The Load Number (LN) assigned to each terminal device
denotes the percentage of the total load to be connected to a telephone loop which is used by the device to prevent overloading. The
termination on a loop may consist of any combination of devices subject only to the requirement that the total of the Load Numbers of
all devices does not exceed 100.
Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection
authority, or electrician, as appropriate.
CAUTION
If your equipment is in need of repair, refer to page A in the front of this document for contact information.
United Kingdom
Ringer Equivalence Number
The Ringer Equivalence Number (REN) is a customer guide indicating approximately the maximum number of items of apparatus that
should be connected simultaneously to the telephone line. The sum of the RENs should not exceed four. This value includes any
BT-provided instrument which may be assumed to have a REN of 1 unless marked otherwise. The REN of this modem is 1.
Connection to Leased Lines
If any other apparatus, including cable or wiring, is connected between the apparatus and the point of connection to any speechband
circuit, then all that other apparatus shall comply with the following:
1. The overall transmission characteristics of all that other apparatus shall be such as to introduce no material effect upon the
electrical conditions presented to one another by the apparatus and the speechband circuit; and
2. All that other apparatus shall comprise only:
(i) apparatus approved for the purpose of connection between the apparatus and a speechband circuit; and
(ii) cable or wiring complying with a code of practice for the installation of equipment covered by this part of BS 6328 or
such other requirements as may be applicable.