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Government Requirements and Equipment Return
Certain governments require that instructions pertaining to CSU connection to the
telephone network be included in the installation and operation manual. Specific
instructions are listed in the following sections.
Notice to Users of the United States Telephone Network
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 on the bottom of the
DSU/CSU. If requested, this information must be provided to the telephone
company.
2. There are two types of telephone lines associated with the equipment. The T1
network connection should be made using a Universal Service Order Code
(USOC) type RJ48C jack. The Service Order Code 6.0F should be specified to the
telephone company when ordering the T1 line. In addition, the proper Facility
Interface Code must be specified to the Telephone Company. The DSU/CSU can
be configured to support any of the following framing format and line signaling
techniques. The DSU/CSU’s configuration must correspond to the T1 line’s
parameters. The 3160 DSU/CSU’s internal modem connects to the Public
Switched Telephone Network using a USOC Type RJ11C jack. The Facility
Interface Code 02LS2 along with the RJ11C jack should be specified to the
telephone company when ordering a dial line for the modem.
316x DSU/CSU Facility Interface Codes
Code
Description
04DU9-BN
1.544 Mbps superframe format (SF) without line power
04DU9-DN
1.544 Mbps SF and B8ZS without line power
04DU9-1KN
1.544 Mbps ANSI ESF without line power
04DU-1SN
1.544 Mbps ANSI ESF and B8ZS without line power
3. The ringer equivalence number (REN) is used to determine the quantity of devices
which may be connected to the telephone line. Excessive RENs on the telephone
line may result in the devices not ringing in response to an incoming call. In most,
but not all areas, the sum of the RENs should not exceed five (5.0). To be certain of
the number of devices that may be connected to the line, as determined by the
total RENs, contact the telephone company to determine the maximum RENs for
the calling area.
4. If the DSU/CSU causes harm to the telephone network, the telephone company will
notify you in advance that temporary discontinuance of service may be required.
But if advance notice is not practical, the telephone company will notify the
customer as soon as possible. Also, you will be advised of your right to file a
complaint with the FCC if you believe it is necessary.