
Independent DS3 and T1 Distribution
Figures 3 and 4 show a DSX-1 (network side) to HDSL (field side) with an optional DS3 (network side) to DSX-1 (user application)
configuration. To configure the HMS-357 Lists 1 and 2 for independent DS3 and T1 distribution, remove the back cover.
For DSX-1 to HDSL Span Configuration:
1Remove the six 6-32 PH screws, and then remove the back panel.
2Disconnect the two 32-pair cables marked RCV TO DSX (lower left of unit) and XMT TO DSX (lower right of unit) from the MUX.
3Route the cables to the openings on the sides of the unit (also used by J3 and J4), using the label on each connector to identify and
connect the correct DSX-1 XMT and RCV function.
For DSX-1 to HDSL Span with DS3 to DSX-1 (user interface) option:
4For optional user applications, connect a shielded male cable to the MUX connectors shown in Figure 4. The 32-pair female connector for the MUX on the lower right becomes the XMT
connection; the connector on the lower left becomes the RCV connection.
5Replace the cover when all configuration steps are completed.
Note: For your convenience, all configuration graphics shown in this addendum appear on the back panel cover of the HMS-357 List 1 and List 2.
Figure 3. DSX-1 to HDSL and DS3 to DSX-1 Schematic
(a) PairGain offers an optional 50-foot, 32-pair shielded cable (P/N 150-2218-01) that can be
connected between the HMS-357 and the network and field cross-connects.
DSX-1
(RCV to DSX)
DSX-1 (XMT
from DSX)
(From equipment
to MUX)
(From MUX to
equipment)
3190 DSX-1
(XMT from DSX)
3190 DSX-1
(RCV to DSX)
3190
P1
P2
DS3 DSX-1
MUX
NETWORK SIDE FIELD SIDE
J3
Loop 1
(XMT to SPAN)
J4
Loop 2
(RCV from
Span)
J8
J10
HMS-357 List 1 and List 2
Figure 4. DSX-1 to HDSL and DS3 to DSX-1 Distribution Configuration
(HMS-357 Back Panel View)