Cisco Systems IPMUX-1E Operation Modes, Static Mode, Dynamic CAS Mode, CESoIP Mode

Chapter 1 Introduction IPmux-1/1EInstallation and Operation Manual

IPmux-1/1E works in conjunction with the rest of the IPmux product line (see Figure 1-9). The combination of IPmux products provides up to 31 per E1 or

24 per T1 remote bundles, attached to one central IPmux-4/16 (see Figure 1-9).

				E1/T1			POTs
			Megaplex
	E1/T1						E1/T1
						IPmux-8/16
	Line 1
Line 2
Line 4	Line 3		IP over
		IPmux-8/16
			Ethernet
							E1/T1
					E1/T1	IPmux-1E
			IPmux-1

Figure 1-9. Grooming of Timeslots from Remote Sites into a

Single E1/T1 Port at Central Site

Other ISDN/FXS/FXO/E&M applications are shown in Figure 1-3,Figure 1-4,and

Figure 1-5.

Operation Modes

Static Mode

When the timeslot allocation is static and no activity is detected, the payload can be efficiently encoded using a constant bit rate.

The TDMoIP payload consists of between one and thirty 48-octet subframes. The number of subframes is pre-configured and typically chosen according to latency and bandwidth constraints.

Dynamic CAS Mode

When timeslots are dynamically allocated, and CAS can be detected for bandwidth conservation, the payload can be efficiently encoded using a variable bit rate.

CESoIP Mode

In general, when the timeslot allocation is static and no activity is detected, the payload can be efficiently encoded using a constant bit rate.

The CESoIP payload size is based on the packetization delay (in msec); the minimum size is 1 msec, and increases in steps of 1 msec.

1-10 Functional Description