Megabit Modem
®
MM300SBP-G2
Quick Installation Guide
Page 1 of 8
O
VERVIEW
The LTI DataComm Megabit Modem MM300SBP-G2 is a versatile, ruggedized high-speed
single wire pair modem used to extend an Ethernet LAN data connection in a point-to-point
application (also called back-to-back) implementation to another modem. The modem uses
Single-Pair High-Speed Digital Subscriber Line (SHDSL) technology with automatic rate-
adaptation to achieve symmetric data rates from 64 to 2304 kbps based on the connection
distance and line condition.
The modem connects through its 10/100 Base-T port to a PC or Local Area Network (LAN).
The DSL port (via bare wire binding posts) provides access to the following type of
connection: connection to another MM300SBP-G2 which provides access to a remote PC or
small LAN via its bare wire binding posts.
Figure 1
shows the MM300SBP-G2 connected to a PC using the black straight-through
cable.
Figure 2
shows the MM300SBP-G2 connected to an Ethernet Switch using the Yellow
cross-over cable.
Figure 1. MM300SBP-G2 Connected Directly to PC
Figure 2. MM300SBP-G2 Connected to an Ethernet Switch
In this point-to-point application, one MM300SBP-G2 is automatically set to remote CPE
mode while the other modem is set for Central Office (CO) mode. This negotiation takes place
at modem start-up and is completely automatic. By bridging traffic between these two
modems, you essentially create one extended LAN that allows the use of a single IP subnet.
F
EATURES
The MM300SBP-G2 provides Media Access Control (MAC) layer bridging of frames received
on its LAN and WAN interfaces. It provides transparent address learning for the LAN
interface. Address entries are aged out after 300 seconds. It provides transparent forwarding
of VLAN and non-VLAN Ethernet frames up to 1536 Bytes.
The DSL connection requires a dedicated single-pair wire to connect the local and remote
units. The modem compensates for DSL (Tip and Ring) reversals; therefore, rewiring the
junction box should not be necessary.
The MM300SBP-G2 is easy to install: connect the cables and it is ready to use. The modem
may be installed on a desktop or mounted on a wall.
Both Black and Yellow cables can be used for the Ethernet switch connection
(MDI, MDI-X port or Auto). The Ethernet switch can have either MDI or MDI-X
ports. The Yellow cable is an example of one kind of Ethernet switch
connection.
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Remote Network
DSL
Local User
MM300SBP-G2
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Remote Network
DSL
Local User
MM300SBP-G2
Ethernet Switch
Avoid using IP Address 172.17.0.1 in your network since it is used for
MM300SBP-G2 internal management. If this IP Address is needed, contact
Technical Support on page 8 on how this can be changed.
The MM300SBP-G2 allows packet sizes up to 1536 Bytes to accommodate
Virtual Local Area Network (VLAN).
