AT&T 7300 series, 7500 series manual Type Operating Communications, System Package, SNA Gateway

LOCAL AREA NETWORK CONNECTIONS 8-19

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S75/S85/G1/G2S75/S85/G1/G2

LAN

BRIDGE

OR

ROUTER

MPDM

D C P

D S 1

T1

D S 1

D C P

MPDM

BRIDGE

OR

ROUTER

LAN

	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	⎜
⎜		⎜		⎜		⎜
⎜ StarLAN,		⎜ StarGROUP		⎜ X.25 Router		⎜
⎜ Token Ring, or		⎜		⎜	SNA Gateway	⎜
⎜		⎜		⎜		⎜
⎜ Ethernet		⎜		⎜		⎜
⎜		⎜		⎜		⎜
⎜ StarLAN or		⎜ Novell		⎜ Gateway Communications		⎜
⎜ Token Ring		⎜		⎜		⎜
⎜		⎜		⎜		⎜
⎜		⎜		⎜		⎜
⎜ Token Ring		⎜ Any		⎜ Microcom MLB-6000 Bridge		⎜
⎜		⎜		⎜ Cisco Router		⎜
⎜		⎜		⎜	VITALINK TransRING Bridge	⎜
⎜		⎜		⎜		⎜
⎜		⎜		⎜		⎜
⎜ Ethernet		⎜ Any		⎜ Microcom MLB-6000 Bridge		⎜
⎜		⎜		⎜ Cisco Router		⎜
⎜		⎜		⎜	VITALINK TransRING Bridge	⎜
⎜		⎜		⎜		⎜

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.