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Control, Transmission, and Synchronization Interfaces

5-14 Issue 8.0 July 2002

In the through timed mode, the TG3 (DS1) circuit packs can also provide DS1

reference outputs to the office BITS clock or other central office equipment. The

LAA17 TG3 (DS1) circuit pack derives the DS1 reference outputs from the internal

oscillator. The LAA18 TG3 (DS1) circuit pack derives the DS1 reference outputs

directly from the OC-48 line reference signals. The DS1 reference output interface

(TIMING OUT 1 and TIMING OUT 2) is located on the interconnection panel of

the Low Speed Shelf - System Controller. For more information about the physical

location of the DS1 reference interfaces, refer to Volume I, Section 3, "Platform

Descriptions."

NOTE:

The OC-12 low speed interface(s) can be provisioned to drop traffic from

both the West and East directions. Thus, the OC-12 is provisioned with

multiple cross-connections. With regard to synchronization (through timed

mode only), the OC-12 interface selects the first cross-connection as its

source for pass through synchronization.

In the FT-2000 OC-48 Repeater Bay, the OC48 Regenerator (OC48 REGENR)

circuit packs derive timing from the incoming OC-48 signals and use it to time their

outgoing OC-48 signals. For example, the OC48 REGENR circuit pack that

accepts the incoming OC-48 signal from high speed line 1E derives timing for the

OC-48 signal transmitted on high speed line 1W (Figure 5-7). Also, the OC48

REGENR circuit pack that accepts the incoming OC-48 signal from high speed

line 1W derives timing for the OC-48 signal transmitted on high speed line 1E.

The FT-2000 OC-48 Repeater Bay does not require TG3 (DS1) circuit packs.

Figure 5-7. Through Timed Synchronization (FT-2000 OC-48

Repeater Bay)

REGENR

OC48

OC-48

REGENR

1E1W

OC48

OC-48

Lucent Technologies FT-2000 OC-48 User Manual

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