H3C Technologies H3C MSR 50 - Manual (Page 126)

3-22
Interface cable
External ports provided by MIM-1AT3 module are two SMB sockets respectively functioning as Tx end
and Rx end for transmitting data and receiving data. The ports work in 75-ohm unbalanced transmission
mode and are connected to the peer device using a pair of 75-ohm unbalanced coaxial cables as shown
in
Figure 3-21 . Several cable length options are available.
MIM-1AE3 and MIM-1AT3 modules use the same type of cables for connection, which are called E3/T3
cables in this manual.
Connecting the interface cable
Some measures have been taken to protect MIM-1AT3 module. To achieve better lightning protection
effects, however, you are recommended to add a special lightning arrester at the input end of the E3/T3
cable when leading it to the outdoors.
Step1 Connect the SMB connector of an E3/T3 cable to the Tx port of MIM-1AT3 module and another end to
the Rx port on the device to be connected;
Step2 Connect the SMB connector of another E3/T3 cable to the Rx port of MIM-1AT3 module and another
end to the Tx port on the device to be connected;
Step3 Check the behavior of the LINK LED on the MIM-1AT3 panel. It is OFF when fault has occurred on the
link and signal is out of synchronization. In this case, please check the link.
MIM-IMA-4E1/MIM-IMA-8E1
Introduction
The 4-port/8-port E1 ATM inverse multiplexing interface module (MIM-IMA-4E1/MIM-IMA-8E1)
provides four/eight E1 interfaces that support the IMA (inverse multiplexing for ATM) technology.
The IMA technology combines multiple low-speed links into a group to support a high-speed ATM cell
stream: It distributes an ATM cell stream over multiple low-speed E1 links on cell by cell basis at the
transmission end and reassembles the cells on the low-speed E1 links into the original stream at the far
end. This technology provides a scalable and cost-effective solution, and is commonly used in
plesiochronous digital hierarchy (PDH) networks to transport ATM cells.
Interface attributes
The following table describes the interface attributes of the MIM-IMA-4E1/MIM-IMA-8E1 module: