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LOCAL AREA NETWORK CONNECTIONS 8-19
_ ______________________________________________________________________________________
_ ______________________________________________________________________________________
_ ______________________________________________________________________________________
LANLAN
D
C
P
D
S
1
S75/S85/G1/G2
D
C
P
D
S
1
S75/S85/G1/G2
T1
MPDMMPDM
BRIDGE
OR
ROUTER
BRIDGE
OR
ROUTER
Figure 8-10. LAN-to-LAN Connections Through the Switch
Table 8-5. LAN-to-LAN Communications Packages
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Type of Operating Communications
LAN System Package
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_ _______________________________________________________
StarLAN, StarGROUP X.25 Router
Token Ring, or SNA Gateway
Ethernet
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StarLAN or Novell Gateway Communications
Token Ring
_ _______________________________________________________
Token Ring Any Microcom MLB-6000 Bridge
Cisco Router
VITALINK TransRING Bridge
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Ethernet Any Microcom MLB-6000 Bridge
Cisco Router
VITALINK TransRING Bridge
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a Network Access Unit (NAU) interface; on the communications system side, is the X.25 circuit card, an
MPDM, and a DCP port. A System 75/G1 permanent switched call or a System 85/G2 dedicated switched
connection is used to connect the MPDMs.
The SNA Gateway
The SNA Gateway enables communication between StarGROUP nodes and a front end processor (FEP) to
an SNA (System Network Architecture) host. For communication between a remote-StarGROUP node and
the SNA host, the SNA Gateway can be used in conjunction with the X.25 router. (See figure 8-12.)
The SNA Gateway package consists of a PC card, gateway software, and a 3270 emulation program. The
PC card and gateway software are installed on the SNA gateway node; the 3270 emulation program runs on
the PC that seeks to access the SNA node. The gateway can maintain communications between the SNA
host and up to 32 LAN nodes at speeds of up 19.2 kbps.