Per-Port Switching On The Active Modules; Lobe Distances Using 8260 Active Tr Modules; Lobe Distances Using 8260 Passive Tr Modules; 18-Port Active Per-Port Switching Module - IBM Nways 8260 Manual

2. It regenerates the signal on each port. This function allows you to have
3. The signal received from each lobe is converted to a digital form before

8.6.1 Per-Port Switching on the Active Modules

Currently, IBM offers the following active per-port switching modules:
In these active per-port switching modules a switch fabric is employed so that
every port has a possible transmission path to every other port and the 10
Note
Please note that it is incorrect to say that we support 250 stations at 4
Mbps. That is not necessarily true since there are some adapters on the
market that implement the minimum elastic buffer required for each
workstation adapter card. These cards, while not affected by the rate of
change of accumulated jitter (which has always been the limitation on
station count) are not able to accommodate the worst case total absolute
jitter that can accumulate. Apart from the initial IBM 4 Mbps adapters
which were offered by IBM about 10 years ago, there are no IBM
adapters that implement the minimum buffer.
longer lobe distances for UTP and STP than is permitted on the 8260 passive
modules or other hubs that do not implement similar function. The
maximum supported lobe length for the active modules is shown in Table 26.
Table 26. Lobe Distances Using 8260 Active TR Modules
Cable Type
STP
UTP Category 3
UTP Category 4
UTP Category 5
FTP
As a comparison, the maximum lobe length supported by the 8260 passive
modules is shown in Table 27.
Table 27. Lobe Distances Using 8260 Passive TR Modules
Cable Type
STP
UTP Category 3
UTP Category 4
UTP Category 5
FTP
entering the module. The digital signal on the active modules makes it easy
to manipulate the flow of data on a per-port basis allowing IBM to offer
active per-port switching modules.

18-port active per-port switching module

Dual fiber repeater module
4 Mbps Ring
800
250
425
425
425
4 Mbps Ring
400
125
200
200
425
Chapter 8. 8260 Token-Ring Support
16 Mbps Ring
400
100
210
225
225
16 Mbps Ring
200
N/A
100
100
225
143