The Tone Commander NT1U-220TC converts an ANSI standard
2B1Q ISDN U-interface from the telco Central Office to an S/T
interface to connect to local customer terminal equipment. Both
point-to-point and multipoint ISDN terminal equipment
configurations are supported.
The NT1U-220TC complies with
ANSI T1.601-1992 and
T1.605-1991 interface standards,
including SC1 and SC2
subchannels, and is compatible
with National-1 and National-2
ISDN standards. In addition, it
may be used as a drop-in
replacement for the AT&T
NT1U-220, and is compatible with
the Tone Commander NT1-220
Rack and the AT&T NT1M-200
rack.
Specifications
NT1U-220TC
Operating Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 – 56.5 VDC
Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625 mW typical
Physical Dimensions . . . . . . . . . . . . . . . . . . . . 6.8
“
H x 4.4
”
W x 1.1
“
D
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7 lb.
Operating Temperature . . . . . . . . . . . . . . . . . . . 0° – 50° C (32° – 122° F)
Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . 5% to 95%, non-condensing
Optional Desktop Power Supply
(P/N 901034)
Power Requirements. . . . . . . . . . . . . . . . . . . . . . 120 VAC, 60 Hz, 15 W
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 A @42 VDC min.
Short Circuit Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . self-resetting
Physical Dimensions . . . . . . . . . . . . . . . . . . . . 2.2
“
H x 2.6
”
W x 3.3
“
D
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 lbs.
Important Safety Instructions
·
Never install telephone wiring during a lightning storm.
·
Never install telephone jacks in wet locations unless the jack
is specifically designed for wet locations.
·
Never touch uninsulated telephone wires or terminals unless
the telephone line has been disconnected at the network
interface.
·
Use caution when installing or modifying telephone wires.
·
When powering the NT1 through the Power connector, use
only the Tone Commander Desktop Power Supply (P/N
901034-01).
·
Do not mount the NT1U-220TC within 12
“
of a heat source.
FCC Requirements
The Tone Commander NT1U-220TC has been tested and found to
comply with the limits for a Class B digital device, pursuant to Part
15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the
equipment is operated in a residential environment. This equipment
generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. However,
there is no guaranty that interference will not occur in a particular
installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning
the equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
·
Where it can be done safely, re-orient the receiving television or
radio antenna.
·
To the extent possible, increase the separation between the
telephone equipment and the television, radio, or other
equipment.
·
If your telephone equipment runs on AC power, plug your product
into an AC outlet that is not on the same circuit as the one used
by your radio or television receiver.
Termination Switch
The termination switch is located on the back of the NT1. It
must be set prior to mounting the NT1. Available settings are
OFF
,
100
W
, and
50
W
.
Set the termination switch to match the premises wiring
between the NT1 and the terminals. Several typical wiring
configurations are shown below, with the appropriate
termination switch setting.
Fixed or adaptive timing selection is not required.
Connectors
Two terminal connectors are provided for convenient terminal
installation; both are parallel connected to the S/T interface.
Pins 7 and 8 of the Terminal and Line connectors (power pins)
also have metallic interconnection.
NT1U-220TC
Installation
Instructions
!
The use of Category 3 or better unshielded twisted pair
cable with T568A or T568B connector wiring is
recommended. Distances shown are maximum for
24-gauge wiring cable, and may vary for other cable types.
RACK
CO NNECTO R
TERM INAL
LINE
PO W ER
TERM INAL
1
8
1
8
1
8
3 – RCV+
6 – RC V-
4 – XM T+
5 – XM T-
7 – -48V
8 – -48V RTN
TERM INAL (S/T)
CO NNECTO RS
4 – TIP
5 – RING
7 – -48V
8 – -48V RTN
LINE (U)
CO NNECTO R
