Paradyne 3172, Operator'S Manual, Page: 15 / 178

Introduction
1-5 3170-A2-GB20-30 March 1999
Table 1-1
Rear Panel Connectors and Switches
Name Function
POWER Supplies power to the E1 DSU/CSU by providing an attachment for the ac power
module or the optional dc power cable (+24 or – 48 Vdc).
AUX PORT Supports SNMP LAN Adapter or daisy-chain connections.
COM PORT Provides access to a locally connected PC, an ASCII terminal or printer, or an
SNMP management link.
DTE Provides access to the DTE Drop/Insert interface. This interface is compatible
with the signal format of ITU-T Recommendation G.703 and the frame structure
of ITU-T Recommendation G.704.
NETWORK—120
Ω
Provides an unkeyed modular jack for a 120-ohm balanced network interface.
NETWORK—75
Ω
TX/RX
Provides two BNC connectors (Transmit and Receive) for a 75-ohm unbalanced
network interface.
NETWORK—120
Ω
/75
Ω
(switch) Selects either a 120-ohm balanced network interface or a 75-ohm unbalanced
network interface.
NETWORK—RX SHIELD (switch) Selects either an “open” or “earth” shield connection for the 75-ohm RX interface.
(This switch must be set to “open” when using the 120-ohm interface.)
CLOCK IN Used to attach an external clock to the E1 DSU/CSU.
PORTs 1– 4 Used to connect the customer’s synchronous data DTE to the E1 DSU/CSU.