Series Configuration: Four Systems - Lucent Technologies MERLIN LEGEND Release 6.0 Network Reference Manual

MERLIN LEGEND Communications System Release 6.0
Network Reference 555-660-150
1 Introduction
Tandem Trunking and Tandem Switching
In view of this fact and the differences noted in
network configurations we looked at earlier.
The next three figures show basically the same configurations that you saw
before, slightly modified to emphasize the differences among them. In these
figures, the lines and trunks literally represent the number of facilities connected
to each system in a given configuration. The PSTN facilities shown here are only
examples. You can connect the same types of loop-start, ground-start, T1
Switched 56, DID (Direct Inward Dialing), and T1-emulated analog lines/trunks to
a network system that you can to a non-networked system.
NOTE:
In the following example, the PRI tandem trunks are implemented on T1
circuits provisioned for bipolar 8 zero substitution (B8ZS) line code.
PRI / 24
PRI / 24
ML A
NY
48 lines
Intersystem
and outside
up to 128-kbps
2B data
Figure 1–4.

Series Configuration: Four Systems

From a planning perspective, consider the following points about the series
configuration illustrated in
System D is linked to the network by tie lines (a total of 8), so users at MLX
display telephones on System D cannot see the name and/or number of a
caller who reaches them from another system in the network.
PSTN
PRI / 24
PRI / 24
ML B
IL
72 lines
Intersystem
and outside
up to 128-kbps
2B data
Figure 1–4.
Table 1–1, we will briefly revisit the
BRI (16)
Tie / 4
ML C
CA
Tie / 4
48 lines
Intersystem
128-kbps 2B
data; outside
up to 128-kbps
2B data
Issue 1
February 1998
Page 1-11
PRI / 24
ML D
CA
32 lines
Outside
128-kbps up to
2B data