Lucent Technologies 7820-0802-003 Specifying the Swan internal clock speed, Parameter Description

Configuring Serial WAN (SWAN) Cards (MAX TNT, DSLTNT)

Specifying the SWAN internal clock speed

Specifying the SWAN internal clock speed

The SWAN slot card can generate a transmit or receive internal clock based on the clock speed of its Serial Communication Adapter (SCA) chips. The maximum clock speed is 5.55 MHz.

To generate an internal clock for a SWAN line, you configure the following parameters:

Parameter	Description
Clock-Mode	Specifies whether the SWAN card generates an internal clock.
	External-Clock (the default) specifies the SWAN line receives clock
	from an external source. Internal-Clock specifies the SWAN line
	generates its own clock. If set to External-Clock, none of the other
	parameters in the Clocking profile apply.
Divider	The number by which the SCA internal clock speed, 16.667 MHz, is
	divided to calculate the internal clock speed. Valid values are from 1
	to 256.
Exp	The exponent which is used to calculate the internal clock speed. Valid
	values are from 0 to 9.

The SWAN card uses the following formula to generate its internal clock:

clock speed (MHz) = ( 16.667 / divider ) / ( 2 to the exp power )

The following example shows how to configure an internally generated clock speed:

1Read the SWAN profile:

admin>read swan {1 13 2}

SWAN/{ shelf-1 slot-13 2 } read

2List the profile:

admin>list

[in SWAN/{ shelf-1 slot-13 2 }] name = 1:13:2

physical-address* = { shelf-1 slot-13 2 } enabled = yes

line-config = { 0 61 static { any-shelf any-slot 0 } { exte +

3List the Line-Config profile

admin>list line-config

[in SWAN/{ shelf-1 slot-13 2 }:line-config] trunk-group = 0

nailed-group = 61 activation = static

call-route-info = { any-shelf any-slot 0 } clocking = { external-clock 1 2 }

4List the Clocking subprofile:

admin>list clocking

[in SWAN/{ shelf-1 slot-13 2 }:line-config:clocking] clock-mode = external-clock

APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide 12-5