363-206-285
Administration and Provisioning
8-24 Issue 3 June 2001
Locked cross-connections are a ring-to-non-ring type of cross-connection
between a ring interface and a non-ring interface in which no path protection
switching is provided (see Figure 8-1).
Figure 8-1. Locked Cross-Connection
A locked cross-connection configuration has the following characteristics:
■ The signal received on a specified channel, for example, m-1-1-1 of the
ring interface m1 from ring 1 in one direction around the ring is transmitted
on a non-ring (DS1) interface.
■ The signal received on the other ring interface (m2), using the other
direction around the ring (ring 2), on the same channel (m-1-1-1) is
ignored.
■ A signal is transmitted from a non-ring interface (DS1 interface) through the
specified channel (m-1-1-1) on ring 2 using ring interface m1.
■ The provisioned AIS or unequipped signal is transmitted on the other
direction around the ring (ring 1) using ring interface (m2). This signal will
not cause any alarms at pass-through nodes and will only cause alarms at
terminating nodes if cross-connections are provisioned.
"Hairpin" cross-connections allow local drop of signals, ring extensions supported
by a ring host node, and allow passing traffic between two ring interfaces on a
single host node. In this case, no high-speed channel is involved and the cross-
connections are entirely within the interfaces in the function units.
M
A
I
N
(a) (b) (c)
1
M
A
I
N
2
Function Unit A
fn-a-1 fn-a-2
Function Unit B
fn-b-1 fn-b-2
Function Unit C
fn-c-1 fn-c-2
Ring 2
Ring 1
DS1
AIS/Unequipped
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