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Ethernet Base Module and Interface ModulesPassport 4400 Hardware Installation Manual
5-4
56kbps CSU/DSU Interface Module
The 56kbps module supports the Dataphone Digital Service (DDS) without the
secondary signaling channel. This interface module supports the following
loopback modes:
• DSU loopback
• CSU loopback
• digital loopback
• local loopback
• local loopback transmit end (LLT)
• local loopback receive end (LLR).
The 56kbpsCSU/DSU interface module may onlybe used in the Port 2(MPANL
port) slot. Do not place the 56kbps module in Port 3.
Figure 5-5. Front and Back View of 56kbps CSU/DSU Interface Module
An 8-position RJ48C jack is provided to interface with the DDS network.
Figure 5-6. 56kbps CSU/DSU Connector
Note: The interface module must be inserted into the
unit with the component side facing down.
Rear View
Pin 1
RJ48
1
2
4
5
6
7
8
3
RJ48 Pin Assignments
Transmit Data from Network
Transmit Data from Network
Receive Data to Network
Receive Data to Network
Pins 3, 4, 5, 6 Not Connected