Chapter 1 Introduction IPmux-1/1E Installation and Operation Manual
1-10 Functional Description
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).
IPmux-8/16
Megaplex
Line 1
E1/T1
Line 2
Line 4 Line 3
E1/T1
IPmux-8/16
E1/T1
POTs
IPmux-1E
E1/T1
IPmux-1
E1/T1
IP over
Ethernet
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.