8-18 Issue 9 October 1998
363-206-204
Releases 9 and 11 Installation Tests
Releases 9 and 11 software are two fiber path-switched rings. Each VT or STS-1
(DS1 or DS3 signal) is transmitted in both directions (clockwise and counter-
clockwise) around the ring. The receiver monitors the signal from both directions
and selects the "best" one. This receiver will select the signal from the incoming
fiber on OLIU M1 as a default. The capacity of the ring is limited to the OC-3 line
rate, which is 84 DS1 services or 3 STS-1‘s or a combination of the two. A timeslot
or channel must be reserved all the way around the ring for each service.
Drop cross-connects are designated by a ring VT/STS-1 channel and an
associated DS1/DS3/EC-1 port. Pass-through cross-connects are designated by
using the same ring VT/STS twice. See Figure 8-4.
In Release 7 drop cross-connects are divided into two types.
■
The standard twoway cross-connect, in which the ring VT/STS-1 channel is
connected to the associated DS1/DS3/EC-1 port of the node.
■
The drop and continue cross-connect, in which a VT/STS-1 signal is cross-
connected into an EC-1 port on a "drop and continue" node. At the same
time that this cross-connect is made, a second cross-connect is made that
continues a copy of that VT/STS-1 signal, on the same timeslot of the ring
that it came into this node on, transmitting it to the next node downstream
on the ring.
NOTE
:
A BBG6 (STS-1E) circuit pack is required in the function unit slots to make
a drop and continue cross-connect.
NOTE
:
The "drop and continue" nodes on a ring system must be setup in pairs,
otherwise there will be a loss of service when the ring path is switched.
An EC-1 interface composed of DS1 services should be cross-connected at the
VT level as opposed to the STS-1 level. Thus in the event of one VT (or more)
failure the channel protection switch would occur. An EC-1 interface composed of
DS3 services should be cross-connected at the STS-1 level.
■
Cross-connect address (to enter/exit the ring):
Ex.
m-1-1-1, a-1-1
a-1-1, m-1-1-1
‘m-1-1-1’ represents (Location of OC-3 signal) - (STS-1 # within the OC-3)-
(VT-Group # within the STS-1)-(VT1.5 # within the VT-G) Address Range
is: m-(1-3)-(1-7)-(1-4)
‘a-1-1’ represents (low speed group)-(DS1 Pack)-(DS1 Port) Address
Range is: (a,b,c)-(1-7)-(1-4)
Summary of Contents for DDM-2000 OC-3
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