IBM BM 8270 - Manual (Page 3)

Added capacity and flexibility
With the 8270 you get added capacity
and flexibility at a low cost per port.
The LAN shown in Figure 1 has provided
excellent service in this data environ-
ment. But growth and new graphics
applications are causing performance
problems on this traditional, shared-
media, 16-Mbps LAN.
Combining switching, full-duplex-
attached servers and micro-segmented,
shared-media LANs (Figure 2) gives the
following advantages:
• No change to installed adapters
• No change to house wiring
• No change to application software
• Fewer users per segment
• More bandwidth per user
• Reduction in the number of bridges
• Reduced complexity
• Reduced cost
8270 Nways LAN Switch Family
Model 800
Backbones remain overburdened by
demands of e-mail, busy servers and
Internet traffic (see Figure 3). Until now
all you could do was install a faster,
shared-media LAN like FDDI.
The 8270 Model 800 can act as a
powerful workgroup switch or replace
the entire backbone with a single switch
(see Figure 4). Use TokenPipes to double
or quadruple the bandwidth if you need
it. TokenPipe allows you to connect up to
four parallel, 32-Mbps paths between
any t wo Token-Ring switches, providing
as much capacity between switches as
you need. This solution means:
• No change to application software
• Elimination or reduction of bridges
• Elimination of all routers except those on
the periphery
• Scalable bandwidth between switches
using TokenPipes
• Simplified network management
3. 8228 MAU
4. 8270 Nways LAN Switch Model 600
5. 8272 Nways Token-Ring LAN Model 108
6. 8226 Token-Ring RJ45 Connection
7. 8239 Token-Ring Stackable Hub
Figure 3. Backbone congestion 1. 2210 Router
2. 8230 Controlled Access Unit
3. 8228 MAU
4. 8270 Nways Token-Ring LAN Model 600
5. 8272 Nways Token-Ring LAN Model 108
6. 8226 Token-Ring RJ45 Connection
7. 8239 Token-Ring Stackable Hub
8. 8270 Nways LAN Switch Model 800
Figure 4. The 8270 Model 800 relieves backbone congestion
1. 2210 Router
2. 8230 Controlled Access Unit