AT&T 874 - Manual (Page 28)

26
When you combine two or more 874 phones you create an interacting
system. You can have up to twelve 874 phones and up to eight telephone
lines. The 874 can also be used with Centrex service.
You can use the fourth line on each station as a private line. The diagram
below illustrates each station as having access to three lines. Notice that the
fourth line is not the same on every station (see “Setting Up a Fourth Line for
Each Station” in the CENTREX OPERATION section of this manual). This
diagram also applies to Centrex users.
NOTE: All 874 features work as described earlier in this manual.
EXPANDING THE 874 SYSTEM
Lines in System
Inter
com Sta
tions
ICM 12
ICM 13
ICM 14
ICM 15
ICM 16
ICM 17
ICM 18
ICM 19
ICM 20
ICM 21
ICM 22
L1
3
3
3
3
3
3
3
3
3
3
3
3
L2
3
3
3
3
3
3
3
3
3
3
3
3
L3
3
3
3
3
3
3
3
3
3
3
3
3
L4
3
3
L5
3
3
3
L6
3
3
L7
3
3
L8
3
3
ICM 11