| Logical
Interfaces |
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Add Logical Interfaces
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Defines one or more logical units that you
connect to this physical T1 interface. You must define at least one
logical unit for a T1 interface. You can define multiple units if
the encapsulation type is Frame Relay.
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Click Add.
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Logical Interface Description
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(Optional) Describes the logical interface.
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Type a text description of the logical interface
to more clearly identify it in monitoring displays.
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IPv4 Addresses and Prefixes
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Specifies one or more IPv4 addresses for the
interface.
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- Type one or more IPv4 addresses and prefixes.
For example:
10.10.10.10/24
- Click Add.
- Click OK.
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Physical Interface Description
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(Optional) Adds supplementary information
about the physical T1 interface.
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Type a text description of the T1 interface
to more clearly identify it in monitoring displays.
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MTU (bytes)
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Specifies the maximum transmission unit size
for the T1 interface.
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Type a value between 256 and 1504 bytes. The default MTU for T1 interfaces is 1504.
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Clocking
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Specifies the transmit clock source for the
T1 line.
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From the list, select one of the following:
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internal—Services gateway's
own system clock (the default)
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external—Clock received from
the T1 interface
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Per Unit Scheduler
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Enables scheduling on logical interfaces.
Allows you to configure multiple output queues on a logical
interface and associate an output scheduler and shaping rate with
the queues.
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- To enable scheduling, select the box.
- To disable scheduling, clear the box.
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| Encapsulation |
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Encapsulation
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Specifies the encapsulation type for traffic
on the interface.
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From the list, select the encapsulation for
this T1 interface:
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PPP
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Frame Relay
-
Cisco HDLC
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Enable CHAP
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Enables or disables Challenge Handshake Authentication
Protocol (CHAP) authentication on a T1 interface with PPP encapsulation
only.
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- To enable CHAP, select the box.
- To disable CHAP, clear the box.
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| CHAP
Local Identity (available if CHAP is enabled) |
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Use System Host Name
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Specifies that the T1 interface uses the services gateway's
system hostname in CHAP challenge and response packets.
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- To enable, select the box (the default).
- To disable, clear the box.
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Local Name
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If Use System Host Name is disabled, specifies
the local name for CHAP to use.
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Type a local name for this T1 interface.
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CHAP Peer Identity
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Identifies the client or peer with which the services gateway communicates
on this T1 interface.
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Type the CHAP client name.
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CHAP Secret
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Specifies the secret password for CHAP authentication,
known to both sides of the connection.
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Type a password that is known to the other
side of the connection. Use a combination of letters and numbers that
is difficult for others to guess.
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| T1
Options |
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Bert Algorithm
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Specifies the bit error rate test (BERT) algorithm
to use during a BERT.
BERT is supported only when transmission is unframed. (See the
Unframed option.)
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TBD
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Bert Error Rate
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Specifies the exponent n in the bit error rate 10–n.
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Type a value between 3 and 7, or 0. For example, a value of 6 specifies that
1 bit out of 1,000,000 is transmitted in error. The default is 0 (no bits are transmitted in error).
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Bert Period
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Specifies the length of time—in seconds—of
the BERT.
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Type a value between 1 and 240. The default is 10.
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Byte Encoding
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Specifies the byte encoding method.
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From the list, select one of the following:
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nx56—7 bits per byte
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nx64—8 bits per byte (the default)
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Frame Checksum
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Specifies the number of bits in the frame
checksum. A 32-bit checksum provides more reliable packet verification
but is not supported by some older equipment.
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Select 16 or 32. The default value is 16.
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Framing Mode
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Specifies the framing mode for the T1 line.
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From the list, select one of the following:
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esf—Extended superframe (the
default)
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sf—Superframe
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Invert Data
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Enables or disables data inversion. Data inversion
is normally used only in alternate mark inversion (AMI) mode.
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- To enable, select the box.
- To disable, clear the box.
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Line Buildout
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Specifies the T1 line buildout in feet for
cables 655 feet (200 m) or shorter, or in decibels for longer
cables.
Line buildout compensates for the loss in decibels based on
the distance from the device to the first repeater in the circuit.
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From the list, select one of the following
line buildouts:
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0–132 (0–40 m) (the default)
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133–265 (40–81 m)
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266–398 (81–121 m)
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399–531 (121–162 m)
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532–655 (162–200 m)
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long-0db
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long-7.5db
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long-15db
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long-22.5db
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Line Encoding
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Specifies the line encoding method.
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From the list, select one of the following:
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ami—Alternate mark inversion
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b8zs—Binary 8 zero substitution
(the default)
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Loopback
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Configures the T1 interface as a loopback
interface for testing purposes.
When T1 is configured as a local loopback interface, the device
transmits test traffic simultaneously to the CSU and to the receiver
at the T1 interface.
When T1 is configured as a remote loopback interface, test traffic
transmitted by the CSU is simultaneously received at the T1 interface
and transmitted back to the CSU.
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From the Loopback list, select one of the
following:
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local—Traffic loops from the
transmitter to the receiver at the T1 interface during tests.
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remote—Traffic loops from the
receiver to the transmitter at the T1 interface during tests.
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Timeslots
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Specifies the number of time slots allocated
to a fractional T1 interface. By default, a T1 interface uses all
the time slots.
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Type numeric values from 1 through 24. You can use any combination of time slots. To configure
ranges, use hyphens. To configure discontinuous slots, use commas.
For example:
1–5,10,24
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