25
If your DSU causes harm to the telephone network, the telephone company may
discontinue your service temporarily. If possible, they will notify you in advance. But if
advance notice is not practical, you will be notified as soon as possible. You will be
advised of your right to file a complaint with the FCC.
If your DSU causes harm to the telephone network, the telephone company may
discontinue your service temporarily. If possible, they will notify you in advance. But if
advance notice is not practical, you will be notified as soon as possible. You will be
advised of your right to file a complaint with the FCC.
Your telephone company may make changes in its facilities, equipment, operations, or
procedures that could affect the proper operation of your equipment. If so, you will be
given advance notice so as to give you an opportunity to maintain uninterrupted
service.
The DBM cannot be used on public coin-operated telephone service provided by the
telephone company. Connection to party-line service is subject to state tariffs. (Contact
the state public utility commission, public service commission, or corporation
commission for information.)
No repairs may be performed by the user. Should you experience difficulty with this
equipment, refer to the

Warranty, Sales, Service and Training Information

in the front of
this document.
For Digital Data Service (DDS) installations, inform the local telephone company of the
appropriate network channel interface code for the service you desire.
InterfaceCode Data Rate(bps)
04DU5-24 2400
04DU5-48 4800
04DU5-96 9600
04DU5-19 19,200
04DU5-56 56,000
The DDS Service Order Number is 6.0Y. The jack configurations required are RJ48S for
the Model 3550 DSU and RJ48T for the Model 3551. With an RJ48T configuration, you
must specify the number of data lines you require. Refer to

Technical Specifications

in
the User’s Guide for V.32 DBM jack information.
After the telephone company has installed the requested jack, you can connect the
DSU with the appropriate cable (provided). 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
that is Part 68 compliant.