Specifications

Functional Description
RADring
Installation & Operation Manual
2-30 RI/RO Modules Functional Description 3/11/98 12:33
Protection in Case of Power Loss
In case of power loss, the TCR automatically loops the main path to the
backup, as shown below. Note that in this case, the repeater is not included
in the ring (because it is not powered).
RETIMING
REGENERATION
AND
JITTER ATTENUATION
TOKEN-RING
DRIVER
MAIN
PATH
BACKUP
PATH
RO
SIDE
Figure 2-21 TCR Loops to Backup Path
When the cable break protection function is enabled and the input signal is
lost, the TCR at the far end will detect this condition, and will also perform
looping to the backup path.
The TCR contains two connector types: a DB-9 ring connector, intended for
use with shielded twisted pair STP cables, such as IBM Type 1, and an RJ-45
connector, intended for use with unshielded twisted pair (UTP) cables. For
connection to UTP, an internal media filter is integrated into the TCR
module, ensuring impedance matching and RFI protection.
The TCR occupies one slot in the RADring enclosure. Operation is full
duplex over 4 wire (twisted pairs). Data rates of 4 or 16 Mbps are switch-
selectable. The TCR operates with a transmission range for IBM type 1 cable
of 750 m/2500 feet at 4 Mbps and 375 m/1250 feet at 16 Mbps; and for
IBM type 3 cable 350m/1100 feet at 4 Mbps and 175m/550 feet at 16
Mbps.