1.2.3.1 0 dB
Receivers on most newer T1 transmission equipment can automatically adjust for
incoming amplitude, allowing them to run at zero attenuation regardless of distance.
1.2.3.2 -7.5 dB, -15 dB, -22.5 dB
Some older T1 transmission equipment cannot automatically adjust for incoming
amplitude and line attenuation must be set accordingly.
1.3 Install the UIM-2T1
1.3.1 IP DSLAM Installation
The UIM-2T1 provides an upstream network connection, via a multiplexer uplink module
(MUM), for Net to Net Technologies' IP DSLAMs; neither an IP DSLAM nor a MUM can function
without an uplink interface module (UIM).
1.3.1.1 Affix the UIM-2T1 to a MUM
z
Select a port on the MUM for installation of the UIM-2T1: either port (1 or 2) may
be used. Although not required for operational purposes, if redundancy is desired
two UIMs may be installed on a MUM, one in each port.
z
Remove the blanking plate from the selected port.
z
Carefully slide the faceplate of the UIM-2T1 under the lip of the MUM faceplate at
the selected port opening such that the UIM-2T1 circuit board is facedown and the
UIM-2T1 label shows through the MUM port opening with the UIM-2T1 model name
along the right-hand edge.
z
Ensure that the mounting holes on the UIM-2T1 are lined up with the
corresponding pems on the MUM circuit board and that the board-to-board
connector key pins are properly aligned.
z
Gently press down across the center of the UIM-2T1 circuit board until the board-
to-board connector is fully seated.
Switch #5 Switch #6 Attenuation
down
down
0 dB
up
down
-7.5 dB
down
up
-15 dB
up
up
-22.5 dB
N
OTE
The UIM-2T1 can be installed on a MUM that is already in service, though you must remove the
MUM from the IP DSLAM chassis in order to do so.
Removal of a MUM from a powered IP
DSLAM will not affect the operational status of other modules within the chassis; it will
however, disengage the IP DSLAM's upstream network connection.
C
AUTION
Blanking plates should be stored for possible future use: if a UIM-2T1 is
removed from a MUM, it must be replaced with either another UIM or a
blanking plate. DO NOT OPERATE AN IP DSLAM WITH A MUM THAT HAS AN
OPEN UIM PORT.
220-0000084 rev 01
