3Com MSR 30, MSR 20, MSR 50 manual FIC-1CT3 interface attributes

180CHAPTER 4: FLEXIBLE INTERFACE CARDS

Step 1: Connect the SMB connector of an E3/T3 cable to the Tx port on the

FIC-1CE3 and the other end to the Rx port on another device.

Step 2: Connect the SMB connector of another E3/T3 cable to the Rx port on the

FIC-1CE3 and the other end to the Tx port on another device.

Step 3: Power on the router, and check the behavior of the LINK LED on the

FIC-1CE3 panel: OFF means fault occurs on the line and the signal is not synchronized. Check the line status.

FIC-1CT3

Introduction	FIC-1CT3, the 1-port channelized T3 interface card, delivers these functions:
	■ In T3 mode, transmitting, receiving, and processing one channel of T3 fast
	traffic; providing T3 traffic access.
	■ In CT3 mode, providing the subscribers with N ⋅ 64 kbps or N ⋅ 56 kbps
	low-speed access, where N is smaller than or equal to 128.
n	T3 represents the tertiary group rate of T system in the TDM system, that is,
	44.736 Mbps. Through T23 and T12A demultiplexing, a T3 channel can be
	channelized into 28 T1 lines, each also supporting the operating mode of CT1.
	T23 means either T2-to-T3 multiplex or T3-to-T2 demultiplex, and T12 means
	T1-to-T2 multiplex or T2-to-T1 demultiplex. “T23” and “T12” discussed here
	represent the demultiplex process.
Interface Attributes	The following table describes the interface attributes of the FIC-1CT3.
	Table 124 FIC-1CT3 interface attributes
	Attribute	Description
	Connector	SMB
	Number of connectors	2
	Interface standard	G.703
		G.704
		G.752
		AT&T TR 54014
		AT&T TR 62415
		ANSI T1.107
	Interface rate	44.736 Mbps
	Cable	T3 cable (75-ohm coaxial cable)
	Operating mode	T3
		CT3
	Supported service	T3 leased line

Interface LEDs The following figure illustrates an FIC-1CT3 panel.