# LM-4 Line Module

> Module label | ES2 4G LM
> Number of ports | Not applicable
> Software release | First supported: 7.0.1
> Description | 176 W maximum Acts as frame forwarding engines for the physical interfaces Responsible for processing data traffic Pairs with IOAs to process data from different types of network connections
> Type | FFA ASIC
> Capability | Supports a line rate of 128–byte packets on IOAs The 100–Gbps switch fabric allocates 3.4 Gbps of overall bandwidth to each regular line module slot and 10 Gbps of overall bandwidth to each of the turbo slots (slot 2 and slot 4). The 320–Gbps switch fabric allocates 10 Gbps of overall bandwidth to each line module slot. The line interface on the ES2 4G LM when installed in a 320 Gbps fabric configuration is 3.9 Gbps; you can achieve this rate with random packet sizes in the range 64–1518 bytes or a mixture of packet sizes that represent Internet mix traffic (IMIX). An ES2 4G LM with an ES2-S1 Service IOA (dedicated tunnel-server port) can receive traffic ranging from 3.5 Gbps (with 256 byte packets) to 3.8 Mbps (1024 to 1492 byte packets) for bidirectional L2TP LNS throughput. The throughput might be less with packets of smaller sizes. A shared tunnel-server port on an ES2 4G LM can handle a maximum of 0.8 to 0.9 Gbps throughput for tunnel services, depending on the packet sizes. The throughput might be less with packets of smaller sizes. See JunosE System Basics Configuration Guide, Chapter 6, Managing Modules for more information.
> Software features | Not applicable
> Model compatibility | E320 router E120 router
> Line module compatibility | Not applicable
> SRP module compatibility | SRP-100 SRP-120 SRP-320
> Line module redundancy compatibility | Yes (Redundancy IOA must be installed in either slot 0 or slot 11) Can only back up another ES2 4G LM
> Port redundancy support | Not applicable
> Cables and connectors | Not applicable
> LEDs | When lit, LED indicates: OK (green)—Self-test passed FAIL (red)—Failure detected ONLINE (green)—Online with no alarms or errors REDUN (green)—Redundant card available
> Alarms, errors, and events | See Monitoring Modules in JunosE System Basics Configuration Guide, Chapter 6, Managing Modules.