3Com MSR 50, MSR 30, MSR 20 manual CT1, Isdn PRI, FT1

92CHAPTER 3: MULTIFUNCTIONAL INTERFACE MODULES

MIM-1T1-F/MIM-2T1-F/MIM-4T1-F

1/2/4-port fractional T1 interface module (MIM-1/2/4T1-F) and MIM-1/2/4T1 module are different in the sense that:

■FT1 operating mode supported by T1-F modules allows only one bundle. In other words, the time slots can only be bundled into one nx64 kbps or 56 kbps channel, where n=1-24. However, a CT1 module allows of arbitrary grouping of the 24 channels;

■T1-F does not support PRI mode.

n Given a MIM-1T1 module, the system automatically creates a serial interface for each timeslot bundle formed on a controller T1 interface.

Interface Attributes The interface attributes of MIM-1T1/MIM-2T1/MIM-4T1 and MIM-1T1-F/MIM-2T1-F/MIM-4T1-F modules are given in the following table:

Table 52 Interface attributes of MIM-1T1/MIM-2T1/MIM-4T1 and

MIM-1T1-F/MIM-2T1-F/MIM-4T1-F modules

Attribute	Description
Connector	RJ-45
Number of connectors	1 (MIM-1T1/MIM-1T1-F module)
	2 (MIM-2T1/MIM-2T1-F module)
	4 (MIM-4T1/MIM-4T1-F module)
Interface standard	G.703/T1.102
	G.704
	AT&T TR 54016
	AT&T TR 62411
	ANSI T1.403
Interface rate	1.544 Mbps
Cable type	T1 cable (100-ohm shielding network
	cable)
Operating mode	CT1, ISDN PRI
	(MIM-1T1/MIM-2T1/MIM-4T1 module)
	FT1
	(MIM-1T1-F/MIM-2T1-F/MIM-4T1-F
	module)
Supported service	1) Backup
	2) Terminal access service
	3) ISDN PRI
	(MIM-1T1/MIM-2T1/MIM-4T1 module)

Interface LEDs MIM-1T1 panel is similar to that of MIM-1T1-F. The following figure shows a MIM-1T1 panel.