Daisychaining Ethernet Cradles; Bandwidth Considerations When Daisychaining - Symbol MC3000 Integrator Manual

2-12 MC3000 Integrator Guide

Daisychaining Ethernet Cradles

To connect several cradles to an Ethernet network, up to four (recommended maximum) Ethernet cradles may be daisychained. The
Speed LED and the Link LED on the Ethernet port 2 function in the same way as the Speed LED and the Link LED on the front of the
cradle.
To daisychain cradles:
1. Connect the first Ethernet cradle to power and to the Ethernet Switch as shown on
2. Connect power to the second Ethernet cradle.
3. Connect the daisychain Ethernet cable (either straight or twisted cable can be used) between Ethernet Port 2 of the first
cradle, and Ethernet Port 1 of the second cradle.
4. Connect additional cradles as described in Step 2 and Step 3. See

Bandwidth Considerations when Daisychaining

Each cradle added to the daisychain impacts the bandwidth allocated to each of the inserted mobile computers, particularly when the
mobile computers attempt to send and receive at data rates that exceed the bandwidth provided to the chain (typically 100 Mbps). If
a mobile computer in a daisychained cradle does not use its bandwidth, that bandwidth is available to other inserted mobile
computers.
Table 2-2 shows allocated bandwidth (based on 100 Mbps) for the number of daisychained cradles, with each mobile computer
attempting transmission at the maximum data rate.
Daisychained Ethernet
Cradle 1
Cradle 2
Cradle 3
Cradle 4
Cradle 5**
Cradle 6**
Cradle 7**
* The maximum bandwidth capacity for the mobile computer is 12,000,000 bits/sec.
** Depending on the application, allocated bandwidth may not be adequate.
Ethernet Port 2
Speed LED
Figure 2-8. Daisychaining Four Slot Ethernet Cradles
Table 2-2. Daisychaining Bandwidth
Bandwidth Allocation For Each
Cradles Ethernet Cradle (bits/sec)
100,000,000
20,000,000
4,000,000
Table 2-2 for bandwidth limations.
Ethernet Port 1
Link LED
Bandwidth Allocation For Each
Mobile Computer (bits/sec)
800,000
160,000
32,000
6,400
Figure 2-5 on page 2-9.
20,000,000*
4,000,000
800,000
160,000
32,000
6,400
1,280