3Com MSR 50, MSR 30, MSR 20 manual MIM-1POS Module, Description of the LEDs on the MIM-1AT3 panel

110CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES

Table 70 Description of the LEDs on the MIM-1AT3 panel

LED	Description
LINK	OFF means no link is present; ON
	means a link is present.
ACT	OFF means no data is being
	transmitted or received; blinking
	means data is being received or/and
	transmitted.

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 121. Several cable length options are available.

n 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

c CAUTION: 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.

Step 1: 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;

Step 2: 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;

Step 3: 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-1POS Module

Introduction MIM-1POS represents the 1-port SDH/SONET interface module. It supports interface rates up to 155.52 Mbps (STM-1/OC-3).

The MIM-1POS can use the protocols such as PPP, Frame Relay and HDLC at the data link layer and IP at the network layer. It allows direct transmission of packets over SONET/SDH. It supports:

■Four SFP types: multi-mode short-haul (1310 nm), single mode medium-haul (1310 nm), single mode long-haul (1310 nm), and single-mode ultra-long haul (1550 nm).

■155.52 Mbps fractional interface