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:
â– 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.
â– 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.
â– 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.
â– 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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