9-18 Issue 9 October 1998
363-206-204
Release 13 (TARP) Installation Tests
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 9-4.
Drop cross-connects are divided into two types:
■
The standard twoway cross-connect, in which the ring VT/STS1 channel is
connected to the associated DS1/DS3/EC-1 port of the node.
■
The drop and continue cross-connect, in which a VT/STS1 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/STS1 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 (STS1E) 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)
■
In Release 13 the ‘all’ option may be used to specify a range of addresses:
Ex.
m-1-all, a-all
‘m-1-all’ represents (main OLIUs)-(STS Group)-(All DS1 Ports)
‘a-all’ represents (function unit)-(All DS1 Ports)
Summary of Contents for DDM-2000 OC-3
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