AT&T MERLIN LEGEND Key System Planning page 81

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Planning Form Instructions—Continued
8.
On page 6 of Form 3c, Complete one block for each 100D module.
Transfer the options information for each module from the corresponding
column of page 1 of Form 3c.
Service Ordered or Planned (Type of Service)
Frame Format.
Line Coding (Supression).
Line Signaling Mode.
Synchronization Timing (Clock Synchronization: Source).
An important part of the NTM review is to ensure that the synchronization
integrity of the network—both this communications system and its far-end
connections—is protected. To facilitate their evaluation, prepare the Network
Planning Map on page 7 of Form 3c. Describe the entire network of DS1
facilities by summarizing the following for each 100D module:
CSU used
distance between the control unit and CSU or far-end connection
types of facilities or services connected to each 100D module
clock synchronization source
As an example, the system described in Figure 3-2 shows a large processor
module system with two 100D modules.
The communications system in Figure 3-2 is configured as follows:
Module 1 in slot 04 is connected to a model ESF-T1 CSU that is
approximately 100 cable feet from the control unit. (The DS1 facility is
connected to the ISDN-PRI network.)
Module 2 in slot 05 is connected to a 551-T1 L1 CSU that is approximately
160 cable feet from the control unit. (The far-end is another communications
system.)
The primary clock synchronization source is the ISDN-PRI network
connected to Module 1. Its path is shown by a line and the letter P.
Note: The dotted line between the control unit and the PBX in Connection 2
indicates that the PBX derives its timing signal from your system.
The secondary clock synchronization path, shown by a line and the letter S,
is the system internal clock.
3-27
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