Carrier Access 1750 user manual Unstructured E3-3 SAM Operational Configuration

Configuration

Unstructured E3-3 SAM

Table 7-13: Unstructured E3-3 SAM Operational Configuration

Item	Options	Comments
Port Name		A descriptive field to identify the port
Port Mode	On-line	This is a status field that can be toggled to off-line,in which case the port will
	Off-line	not be available to make calls and passive SVCs are refused.
Framing	G.751	G.751 is a European framing standard used for PDH applications.
	G.832	G.832 is a European framing standard set by the ITU for transporting SDH
	Unframed	elements on PDH network.
		Unframed requires a 44.736 Mbps input.
Clock Mode	SRTS	NOTE: SRTS is a proprietary timing algorithm and may ONLY
	Adaptive	be used with specific written prior permission from Carrier Access
	Network	Corporation. Additional license fees may apply.
	BITS Clock
	Loop	SRTS measures the Service Clock input frequency against a network-wide
		ATM synchronization clock and sends the difference signals in the AAL1
		header to the destination Broadmore 1750 circuit emulation interface. The
		different signals are then combined with the network-wide ATM
		synchronization clock to re-create the input service clock. If more than one
		ATM clock synchronization is present in the network, an alternate timing
		recovery method must be selected. For this method to work, the ATM network
		must be synchronized to a single network-wide clock source. User equipment
		should be configured to internal clock.
		Adaptive Timing maintains a pre-defined fill level in the Circuit Emulation
		Re-assembly buffer to control the timing output to user equipment. This
		method of timing recovery does not require a Synchronous ATM network and
		is used in applications where network wide synchronization is not available.
		(Synchronous) Network method of clock recovery derives timing from the
		ATM Network and propagates it to the CE Service Interface. The ATM
		network must be synchronized to a single source clock. User equipment should
		be configured to recover timing from the Broadmore 1750 CE service
		interface.
		(Synchronous) Loop CE interface will derive clock from the attached E3 user
		equipment and transmit from the CE interface at that rate. The user equipment
		should be configured for Internal timing if the Broadmore 1750 CE service
		interface is configured for Synchronous loop.
		BITS- (Building Integrated Timing Supply) distributes standard timing to
		equipment within the central office. The Broadmore 1750 accepts BITS via
		either NIM IOM. The fallback for the primary BITS clock is the other BITS
		clock. The fallback for no BITS is the internal clock of the NIM.

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