Nortel Meridian 1 Manual page 25

The following notes refer to Figure 9 on page 20, which illustrates the M2250
attendant console cross-connections.
Note 1: The M2250 is powered by means of the line circuits. In addition
to the primary TN, secondary TN, and ASM TN, two TNs are cabled to
the M2250 using the +AUX and –AUX leads. The maximum loop length
is 3000 ft of 24 AWG wire.
Note 2: When additional options are used (BLF or display backlight
option), an additional 16 V dc power supply is required. The 16 V dc
source is cabled using +VPS and VPS RTN leads. The maximum
distance from the console to the power source is 120 feet of 24 AWG
wire. Please note if both options are installed, only one 16 V dc power
supply is required.
Note 3: It is recommended that five consecutive TNs on the line circuit
be allocated for each console.
Note 4: When used with the ISDLC, the M2250 requires QPC578
vintage D or later.
Note 5: The third TN must be cross-connected to the console cable
WH/SL pair whether or not an ASM (Attendant Supervisory Module) is
installed. This third TN provides additional console power which is
required.
Table 4 on page 22 explains where each M2250 cable pair is connected.
Table 5 on page 24 lists the M2250 typical cross-connections.
Attendant console
Telephone and Attendant Console Installation
Page 21 of 144