Unidirectional Path Switched Rings - Cisco ONS 15327 User Documentation

Unidirectional Path Switched Rings

Disable the ring on the current node:
Step 7
a.
b.
c.
If an OC-N card is a timing source, select the Provisioning > Timing tabs and set timing to Internal.
Step 8
Place the ports on the card out of service:
Step 9
a.
b.
Step 10 Physically remove the card.
Insert the card into its new slot and wait for the card to boot.
Step 11
To delete the card from its former slot, right-click the card in node view and select Delete from the list
Step 12
of options.
Step 13 Place the port(s) back in service:
a.
b.
c.
d.
Step 14 Follow the steps described in the
same cards (in their new slots) and ports for east and west. Use the same BLSR Ring ID and Node ID
that was used before the trunk card was moved.
Recreate the circuits that were deleted. See the
Step 15
page 6-2
If you use line timing and the card you are moving is a timing reference, reenable the timing parameters
Step 16
on the card. See the
5.3 Unidirectional Path Switched Rings
UPSRs provide duplicate fiber paths around the ring. Working traffic flows in one direction and
protection traffic flows in the opposite direction. If a problem occurs in the working traffic path, the
receiving node switches to the path coming from the opposite direction.
CTC automates ring configuration. UPSR traffic is defined within the ONS 15327 on a circuit-by-circuit
basis. If a path-protected circuit is not defined within a 1+1 or BLSR line protection scheme and path
protection is available and specified, CTC uses UPSR as the default.
Figure 5-16
signal travels on the working traffic path through Node ID 1. The same signal is also sent on the protect
traffic path through Node ID 3. If a fiber break occurs
receiver to the protect signal coming through Node ID 3.
Because each traffic path is transported around the entire ring, UPSRs are best suited for networks where
traffic concentrates at one or two locations and is not widely distributed. UPSR capacity is equal to its
bit rate. Services can originate and terminate on the same UPSR, or they can be passed to an adjacent
access or interoffice ring for transport to the service-terminating location.
Cisco ONS 15327 User Documentation, R3.3
5-20
Click the Provisioning > Ring tabs.
Highlight the ring and click Delete.
On the confirmation message, confirm that this is the ring you want to delete. If so, click Yes.
Double-click the card.
On the Provisioning > Line tabs in the Status section, choose Out of Service for each port.
To open the card, double-click or right-click the card and select Open.
Click the Provisioning tab.
From Status choose In Service.
Click Apply.
for instructions.
"Set Up ONS 15327 Timing" procedure on page 3-13
shows a basic UPSR configuration. If Node ID 0 sends a signal to Node ID 2, the working
"Setting Up BLSRs" section on page 5-7
"Create an Automatically Routed Circuit" procedure on
(Figure
Chapter 5 SONET Topologies
to reenable the ring using the
for instructions.
5-17), Node ID 2 switches its active
June 2002