Using Punch-Down Blocks - SMC Networks SMC7724M/VSW Installation Manual

Using Punch-down Blocks

Buildings Phone-line
Punch-down Block
Follow the steps below to connect an EE Splitter to a building's phone-line
system using a punch-down block:
1. Connect one RJ-21 flat cable from the PBX to the connector on the
splitter's rear panel labeled "PBX/MDF."
Note: Some installations may also have a separate punch-down block
between the PBX and the EE Splitter. In this case, connect an
RJ-21 cable from the splitter's "PBX/MDF" connector to the
punch-down block.
2. Connect another RJ-21 flat cable from the RJ-21 connector on the
front of the splitter labeled "Line" to the building's phone-line
punch-down block. Note that the connection to the punch-down
block usually requires punching down the free wires from the RJ-21
cable.
Note: If you use pre-wired punch-down blocks with RJ-21 connectors,
be sure they are wired to match the pin assignments of ports on
the back of the splitter. To ensure that your cables are properly
wired, refer to "RJ-21 Port Pin Assignments" on page B-6.
Twisted-pair
Connection
to CPE
Free
Wiring
RJ-21
Line
Connector
Line Connector
Figure 4-1. Connecting to Punch-down Blocks
C
Punch-down Block
with RJ-21 Connector
RJ-21
Cables
PBX/MDF
Connector
EE Splitter
RJ-21 C
ONNECTING ABLES
PBX
4-3