60
MIM-IMA-4E1/MIM-IMA-8E1
Introduction
The 4-port/8-port E1 ATM inverse multiplexing interface module (MIM-IMA-4E1/MIM-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
plesiochronous digital hierarchy (PDH) networks to transport ATM cells.
Interface specifications
Table 83 Interface specifications
Item
MIM-IMA-4E1
(75-ohm)
MIM-IMA-8E1
(75-ohm)
MIM-IMA-4E1
(120-ohm)
MIM-IMA-8E1
(120-ohm)
Connector DB68
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 (1640.42 ft)
150 m (492.13 ft)
Operating
mode
ATM E1 independent link/IMA bundle mode
Supported
service
AAL5 (ATM adaptation layer 5)
Protocol
•
PPPoA
•
PPPoEoA
•
IPoA
•
IPoEoA
Service type
•
CBR
•
VBR-rt
•
VBR-nrt
•
UBR
Содержание DSIC-9FSW
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