Lucent Technologies DDM-2000 OC-3, Руководство по установке

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363-206-204
Release 7 Installation Tests
Issue 9 October 1998 6-17
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 7 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)
■
Pass-through address at all nodes other than the entry/exit nodes is as
follows:
Ex.
m-3-7-4 m-3-7-4
Pass-throughs must match.
NOTE
:
Port cross-connects do not have to match. At one node a cross-connect
may be established as:
m-1-1-3, a-1-3
At another node the cross-connect may be:
m-1-1-3, a-3-6
NOTE
:
Typically, m-1-1-1 corresponds to a-1-1, m-1-1-2 to a-1-2, etc.
NOTE
:
M1/Main-1 and M2/Main-2 refer to OLIU slots. In a timeslot address
"m-1-1-1" the "m" refers to main of both OLIUs, and the 1 refers to the first
STS-1.
NOTE
:
If a pass-through is missing, alarms may not appear. If three twoway cross-
connects exist, alarms may not appear (if traffic is currently routed in the
other direction). Check each timeslot to verify two cross-connect s exist
and that the remainder are pass-throughs. See Figure 6-3.