Transport Mode
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Sets the encapsulation mode:
SONET: (Default for DS1) Transports DS1s in VT1.5s. When Japan Byte
Synchronous mapping is used, transports DS1s in TU11/AU3 SDH. When
Japan Byte Synchronous mapping mode is selected, the OC-N card that
DS1/E1-56 is cross-connected with must be in SDH mode and the incoming
signal must be AU3 mapping SDH.
AU4: (Default for E1) Transports DS1s and E1s in a structured VC4 payload
(STS-3c).
Note: Switching from one transport mode to another is not allowed if a port is in a circuit, in service, or selected as a timing reference for the NE.
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Operating Mode
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Sets the port usage:
All DS1: (Default) All 56 ports are used as DS1 ports. Ports 1 to 28 are with
retiming capability. Any of the 56 ports can be selected to provide timing
reference to the NE.
All E1: All 56 ports are used as E1 ports. Ports 1 to 21 are with retiming
capability. Any of the 56 ports can be selected to provide timing reference to
the NE.
The restrictions on switching between these selections is based on existing circuits, ports being in service, and port usage as an NE reference source.
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Retiming Enabled
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When checked, retimes the transmit clock to the clock reference of the NE, removing the asynchronous relationship between electrical line and SONET transport time domains for the electrical path. If the Operating Mode is All DS1, Retiming Enabled is checked and cannot be changed.
When not checked for E1 mode, leaves the port as "through-timed," which means that the transmit clock is extracted from the DS1/E1 data from the SONET payload coming from the backplane.
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Port to VT Mapping
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Selects the ordering in which ports are mapped into the VT1.5s within an STS-1. This setting applies to a group of ports associated with the same STS-1.
GR 253 interleaves the ports into the VT1.5 (DS1-14 compatible). In this
mapping, sequential port numbers are mapped to interleave the 7 VT groups
of VT1.5s. Interleaving by VT group essentially means that the ports follow
the order of transmission of the VT1.5s, as indicated in GR-253.
INDUSTRY (default for E1 mode) maps sequential port numbers to fill each
VT group in order. In this mapping, ports in sequential progression are packed
into VTs filling an entire VT group before moving on to the next VT Group.
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Apply
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Applies changes made to the fields in the tab.
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Reset
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Cancels any changes to the tab and returns the fields to their last-saved settings.
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Help
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Displays context-sensitive help.
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