H3C Technologies H3C MSR 50 - Manual (Page 207)

4-12
FIC-IMA-4E1/FIC-IMA-8E1
Introduction
The 4-port/8-port E1 ATM inverse multiplexing interface module (FIC-IMA-4E1/FIC-IMA-8E1) provides
four/eight E1 interfaces that support the IMA (inverse multiplexing for ATM) technology.
The IMA technology combines multiple low-speed links into a group to support a high-speed ATM cell
stream: It distributes an ATM cell stream over multiple low-speed E1 links on cell by cell basis at the
transmission end and reassembles the cells on the low-speed E1 links into the original stream at the far
end. This technology provides a scalable and cost-effective solution, and is commonly used in PDH
networks to transport ATM cells.
Interface attributes
The following table describes the interface attributes of the FIC-IMA-4E1/FIC-IMA-8E1:
Table 4-11 Interface attributes of the FIC-IMA-4E1/FIC-IMA-8E1
Description
Attribute
FIC-IMA-4E1
(75-ohm)
FIC-IMA-8E1
(75-ohm)
FIC-IMA-4E1
(120-ohm)
FIC-IMA-8E1
(120-ohm)
Connector DB-68
Number of connectors 1
Interface standard ITU-G.703, ITU-G.704
Interface rate 2.048 Mbps
Cable type
75-ohm 4E1
conversion cable 75-ohm 8E1
conversion cable 120-ohm 4E1
conversion cable 120-ohm 8E1
conversion cable
Max transmission
distance
500 m (1640.4 ft.) 150 m (492.1 ft.)
Operating mode ATM E1 independent link/IMA bundle mode
Supported service AAL5
Protocol PPPoA, PPPoEoA, IPoA, IPoEoA
Transmission rate CBR/VBR-rt/VBR-nrt/UBR
Interface LEDs
The following figures illustrate the FIC-IMA-4E1 and FIC-IMA-8E1 (75-ohm) panels:
Figure 4-14 75-ohm FIC-IMA-4E1 panel