Fujitsu SRS-1050 User Manual

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Multipoint configurations 
 
In older ISDN installations, most phone connections are point-to-point.  
Each phone in a point-to-point configuration requires a separate line into 
your building.  However, most service providers now offer multipoint 
configurations as a subscription option.  In a multipoint configuration, up 
to eight devices (digital sets and/or terminal adapters) can be connected 
to a single line.  For example, your company could connect two digital 
sets and two data terminal adapters to a single line. The two digital sets 
could each use one B-channel for voice communication, and the data 
terminal adapters could use the D-channel for packet-switched data calls.   
 
Multipoint operation goes on behind the scenes.  The only time you 
would be aware of it is if you get "blocked" from using a line.  If more 
than two users bid for the two B-channels at the same time, the message 
B-CHANNEL BUSY appears.  Talk to your System Administrator if you 
get this message frequently. 
 
 
SPID 
 
For your SRS-1050 to work on a multipoint line, it must have a valid 
Service Profile Identifier (SPID).  The SPID number is usually entered 
when the SRS-1050 is installed.  So if your digital set already has a SPID 
number, you don't have to reenter it.  If you do need to enter a SPID 
number, you can find out what it should be from your System 
Administrator or service provider.  For the procedure to enter a service 
profile identifier, see Appendix B. 
 
 

CAUTION: 

Once the SPID number is entered, don't change it unless 

your System Administrator tells you to do so.  Your SRS-1050 won't 
work without the correct SPID number.  If the SPID number is wrong, 
the set displays the message SPID NG.  (The message is redisplayed a 
second time if the data terminal adapter SPID is also invalid.)  Enter 
the correct SPID number and you'll get the normal dial tone.