Table 10: Frequency Off-Set By Clock Type - Motorola Canopy T1 User Manual

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Instructions manual (40 pages)

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Table of Contents

Canopy T1/E1 Multiplexer

source for customer data. They accomplish this through clock recovery from higher-order

T1 clocks from the Class 5 COs or through an internal clock that is running at Stratum 4.

The Canopy T1/E1 Multiplexer does not have an internal clock. Therefore, it must be set

to synchronize to an incoming T1/E1 clock source. Each network node's (PBX, Channel

Bank, Router) clock is based on the best available clock source for it. If multiple clocks

are available with the same quality, then the source that is the closest, in number of hops,

is chosen.

Frequency Off-set

Clock

(accuracy over 24

Type

Stratum 1

Clock

Stratum 2

Clock

Stratum 3

Clock

Stratum 4

Clock

The Canopy T1/E1 Multiplexer does not have an internal oscillator. Therefore, the unit

must be synchronized to a T1/E1 bit stream in order to accurately pass T1/E1 traffic. The

Canopy T1/E1 Multiplexer may be configured to synchronize to a near-end or far-end

Canopy T1/E1 Multiplexer.

Master and Secondary Clocks

The clock on each Canopy T1/E1 Multiplexer must be correctly configured to prevent

frame slips. Each of the four (4) T1/E1 ports may be configured as the Master clock

source or the Secondary clock source. Any port may be set to Master and any port may

be set to Secondary, however there may only be one (1) Master and one (1) Secondary

clock setting per unit.

Note: If neither the Master or Slave port is active, then the system will start at Port 1 and

search in logical order until it finds an active T1/E1 port, at which time it will assume this

to be the Master clock source.

Two scenarios are shown below, one scenario with Port 1 set to Master and Port 2 set to

Secondary. The second scenario shows Port 1 set to Secondary and Port 3 set to

Master.

Issue 1