4-44 Issue 9 October 1998
363-206-204
Powering, Verification, and Circuit Pack Installation
Notes
:
1. If the shelf is located in an RT, set the timing mode for "Loop-Main".
2. If the shelf is located in a CO and the DDM-2000 OC-3 is NOT connected to a DS1 clock
(J37 on backplane), set the timing mode for "free run".
3. If the shelf is located in a CO and the DDM-2000 OC-3 is connected to a DS1 clock (J37
on backplane), set the timing mode for "external".
4. The pulse format (AMI or B8ZS) and frame format (superframe or extended superframe)
are set for the attributes of the external clock if external timing is selected. In the absence
of DS1 clock information, set line code for AMI and frame format for superframe.
Figure 4-13. BBF2 TGS Option Switches
Switch 1 Settings
Line Code Selection
Frame Selection
Timing Mode Selection
Pulse
Format
Sec 1
Frame
Format
Sec 2
Timing
Format
Sec 3
Chan 1
Sec 4
Chan 2
AMI
ON
SF
ON
Free Run
ON
ON
External
OFF
ON
B8ZS
OFF
ESF
OFF
Loop-Main
ON
OFF
(Invalid)
OFF
OFF
S1
Component Side
Connector
Edge
Latch
4
3
S1
OFF
ON
2
1
Содержание DDM-2000 OC-3
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