Install and Administer Trunks
Add TN1654 DS1 Converter (r only)
678
SI Installation and Upgrades
June 2004
The TN1654 DS1 converter circuit pack supports from 1 to 4 T1 (24 channel) or E1 (32 channel)
facilities.
For more information on this DS1 converter, see
•
Circuit Pack Switches
on page 678
•
Circuit Pack and Cabling (T1 Only)
on page 678
•
75-ohm E1 Interface Cabling
on page 678
Task List: Adding a TN1654 DS1 Converter
•
Set Circuit Pack Switches (TN1654 DS1 Converter)
on page 681
•
Installing TN1654s in a Port Carrier
on page 682
•
Installing TN1654s in a Switch Node Carrier
on page 683
•
Connecting a Port Carrier to a Switch Node Carrier (TN1654 DS1 Converter)
on page 684
•
Connecting Through a Channel Service Unit
on page 685
•
Mounting the 127A (TN1654 DS1 Converter)
on page 689
Return to Task List
Circuit Pack Switches
The configuration switches on the TN1654 must be set before the circuit pack is installed. The TN1654
can be configured for either T1 or E1 operation. All 4 facilities on the circuit pack are configured as a
group. It is not possible to have T1 and E1 facilities supported on the same circuit pack at the same time.
The T1 line impedance is fixed at 100 ohms, and the T1 framing is selectable for ESF (Extended Super
Frame) or D4 for each facility. The E1 facility line supports termination impedances of 120 ohms for
twisted-pair and 75 ohms for coax wiring.
Figure 273, DS1 Converter Circuit Pack Switches,
on page 679 shows the location of the switches.
TN1654 DS1 Converter Switch Functions
on page 679 and
TN1654 DS1 Converter Switch Settings
on
page 680 show the switch-setting functions and positions, respectively.
Circuit Pack and Cabling (T1 Only)
The installation instructions are provided as examples only.
NOTE:
Be sure to label all of the cables as they are installed.
75-ohm E1 Interface Cabling
For certain markets with 75-ohm E1 service, the DS1 converter requires an adapter to convert the 120
ohms to 75 ohms.
Figure 274, 127A BALUN Coaxial Adapter,
on page 680 shows the 127A BALUN
coaxial adapter.