Configuring Fractional T1/E1 Devices

This document describes the configuration commands for Fractional T1 and E1 devices. It includes the following topics:

Overview of Fractional T1/E1 Devices

The FTE1 device comes configured for either T1 or E1, but not both. The FTE1 software automatically detects which option is present, and restricts configurations accordingly for either T1 or E1 operation.

Physical Device Features

T1 modules support the following features:

Extended Super Frame (ESF) framing using B8ZS signal coding at 1544 kbps according to AT&T TR62411.
Integrated Channel Service Unit (CSU) and Data Service Unit (DSU).
You cannot configure the following characteristics, but you may need to know them for line provisioning specifications:
- DS0 Idle Code is 0x7F
- Clock source is derived from the network

E1 modules support the following features:

CRC-Multiframe framing for E1 using HDB3 signal coding at 2048 kbps, according to ITU-TG.703, G.704, G.706, and TBR13.
Unstructured E1 using HDB3 coding at 2048 Kbps, according to TBR12.

Data Link and Signalling Support

The following is a list of data link and signalling support for Fractional T1/E1 modules, including channel and data types.

Clear Channel Capability on each DS0, and supports Nx64Kbps channel arrangements.
- For T1 applications, N=1 to 24. The T1 module is also compatible with the Nx56Kbps channel arrangements, for links that cannot support Clear Channel Capability.
- For structured E1 applications, N=1 to 30. For unstructured E1, N=32.
HDLC data, and either PPP or Frame Relay data-link layers.

In addition, the T1 module supports

Facility Data Link (FDL), as specified in ANSI T1.403 and AT&T TR54016, for monitoring and reporting line error statistics, and facilitating network-initiated loopbacks for diagnostic purposes.

Limitations

The Fractional T1 and E1 modules do not support Primary Rate ISDN (PRI) or channelized T1/E1.

Displaying the T1 Prompts

The T1 configuration applies to a physical device. The configuration prompt includes the number of the interface you are configuring. If you have multiple interfaces on one device, it does not matter which Circuit Config <NET-#> prompt for the device you use to get to the T1 Configuration prompt.

To display the T1 Config <WAN#> prompt,

1. To see a list of devices, enter list devices at the Config> prompt. To see a list of interfaces, enter list interfaces at the Config> prompt.

2. Enter the network command to display the circuit configuration prompt. The network number is the number of a serial interface.

Config>network
What is the network number [0]? 1
Circuit Configuration
Circuit Config <NET-1>

3. Enter s1 at the Circuit Config <NET-#> prompt.

Circuit Config <NET-1> sl
Serial Line Configuration
Serial Config <WAN2>

4. Enter t1 at the Serial Config <WAN#> prompt.

Serial Config <WAN2>t1
T1 User Configuration
T1 Config <WAN2>

Note: Notice that the Serial Config and T1 Config prompts include the number of the device you are configuring, not the interface.

To display the T1 <WAN#> prompt,

1. To see a list of devices, enter list devices at the Monitor> prompt. To see a list of interfaces, enter list interfaces at the Monitor> prompt.

2. Enter network followed by the number of the interface you want to monitor.

Monitor>network 1
Circuit <NET-1>

3. Enter s1 at the Circuit <NET-#> prompt.

Circuit <NET-1> sl
Serial Line Console

Serial Console <WAN2>

4. Enter t1 at the Serial Console <WAN2> prompt.

Serial Console <WAN2> t1
T1 User Console

T1 <WAN2>

Displaying the E1 Prompts

The E1 configuration applies to a physical device. The configuration prompt includes the number of the interface you are configuring. If you have multiple interfaces on one device, it does not matter which Circuit Config <NET-#> prompt for the device you use to get to the E1 Configuration prompt.

To display the E1 Config <WAN#> prompt,

1. To see a list of devices, enter list devices at the Config> prompt. To see a list of interfaces, enter list interfaces at the Config> prompt.

2. Enter the network command to display the circuit configuration prompt. The network number is the number of a serial interface.

Config>network
What is the network number [0]? 4
Circuit Configuration
Circuit Config <NET-4>

3. Enter s1 at the Circuit Config <NET-#> prompt.

Circuit Config <NET-4> sl
Serial Line Configuration

Serial Config <WAN1>

4. Enter e1 at the Serial Config <WAN1> prompt.

Serial Config <WAN1> e1
E1 User Configuration
E1 Config <WAN1>

Note: Notice that the Serial Config and E1 Config prompts include the number of the device you are configuring, not the interface.

To display the E1 <WAN#> prompt,

1. To see a list of devices, enter list devices at the Monitor> prompt. To see a list of interfaces, enter list interfaces at the Monitor> prompt.

2. Enter network followed by the number of the interface you want to monitor.

Monitor>network 4
Circuit <NET-4>

3. Enter s1 at the Circuit <NET-#> prompt.

Circuit <NET-4> s1
Serial Line Console

Serial Console <WAN1>

4. Enter e1 at the Serial Console <WAN1> prompt.

Serial Console <WAN1> e1
E1 User Console

E1 <WAN1>

Fractional T1 and E1 Commands

Table 21 summarizes the Fractional T1 and E1 commands. The software detects which module you have installed, T1 or E1, and displays the appropriate commands for that module.

Press Space twice after you type a command to display the available parameters for each command. Enter help for information about using the command line interface.

[C] means the command is available at the T1 Config <NET-#> or E1 Config <NET-#> prompt.

[M] means the command is available at the T1 <WAN#> or E1 <WAN#> prompt.

Table 21 Fractional T1 and E1 Commands

Command Function

Clock [M] Sets the clocking for T1 or E1 modules to either derived or internal.

Disable [M] Disables T1 or E1 loopbacks.

Enable [C] [M] At the configuration prompt, enables active timeslots. At the monitoring prompt, enables loopbacks.

Exit [C] Returns to the previous prompt.

List [C] Lists the current configuration of the T1 or E1 module.

Parameters [M] Displays current runtime configuration of the T1 or E1 module.

Set [C] Sets various parameters for the T1 or E1 connection.

Statistics [M] Displays statistics for the T1 or E1 module.

Table 21 Fractional T1 and E1 Commands
Command	Function
Clock [M]	Sets the clocking for T1 or E1 modules to either derived or internal.
Disable [M]	Disables T1 or E1 loopbacks.
Enable [C] [M]	At the configuration prompt, enables active timeslots. At the monitoring prompt, enables loopbacks.
Exit [C]	Returns to the previous prompt.
List [C]	Lists the current configuration of the T1 or E1 module.
Parameters [M]	Displays current runtime configuration of the T1 or E1 module.
Set [C]	Sets various parameters for the T1 or E1 connection.
Statistics [M]	Displays statistics for the T1 or E1 module.

Clock [M]

Sets the clocking for T1 or E1 modules to either derived or internal. By default, clocking is derived from the network. You should use internal clocking only in configurations where two T1 or E1 modules are connected back-to-back.

Syntax: clock

Example: clock

D(ervied) or I(nternal) [D]?

Disable [M]

For T1 modules, disables T1 line (remote) loopback or disables T1 payload loopback.

Syntax: disable

line_loopback
payload_loopback

The following example disables line loopback for a T1 module.

Example: disable line_loopback

For E1 modules, disables E1 line (remote) loopback.

Syntax: disable

Example: disable

Enable [C] [M]

At the configuration prompt, enables active timeslots.

At the monitoring prompt, enables loopback.

Enable Timeslots [C]

Enables active T1 or E1 timeslots for this interface. You can enter the timeslot values individually or in contiguous ranges.

For T1 interfaces you can enter values of 1 through 24.

For E1 interfaces, you must set the E1 framing format to G.704 or G.704 with timeslot 16 before you can enable timeslots. Use the e1-framing-format. Your E1 service provider tells you how many timeslots to enable.

For E1 interfaces with G.704 format enabled, you can enable up to 30 timeslots, but the software does not enable timeslot 16.
For E1 interfaces with G.704 format with timeslot 16 enabled, you can enable up to 30 timeslots. Timeslot 16 is always enabled.

Syntax: enable timeslots

#-of-timeslots

Example: enable timeslots

Enter number of timeslot(s) [1]? 10

Enable [M]

For T1 modules, enables T1 line (remote) loopback or enables T1 payload loopback.

Syntax: enable

line_loopback
payload_loopback

The following example enables line loopback for a T1 module.

Example: enable line_loopback

For E1 modules, enables E1 line (remote) loopback.

Syntax: enable

Example: enable

Exit [C]

Returns to the previous prompt.

Syntax: exit

Example: exit

Circuit Config <NET-1>

List [C]

Lists the current configuration of the T1 or E1 module.

Syntax: list

The following example is a display of a T1 module

Example: list

Circuit Id:

Timeslots enabled:  1  2  3  4  5  6 .  .  .  .  .  .  .  .  .  .
                    .  .  .  .  .  .  .  .

DS0 channel speed:  56K
CRC6 mode:          ANSI
Line Build Out:     0 - 133 feet/0 dB

The following example is a display of an E1 module

Example: list

Circuit Id:

Timeslots enabled:   0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
                    16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Frame Format:       Unstructured

Parameters [M]

Displays current runtime configuration of the T1 or E1 module.

Syntax: parameters

Example: parameters

The following example is a display of a T1 module

Timeslots enabled:  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .
                    .  .  .  .  .  .  .  .

DS0 channel speed:  56K
CRC6 mode:          ANSI
Line Build Out:     0 - 133 feet/0 dB

The following example is a display of an E1 module

Timeslots enabled:   0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
                    16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Frame Format:       Unstructured

Set [C]

Sets parameters for T1 and E1 modules.

Syntax: set

channel-speed
circuit-id
crc6
e1-framing-format
line-build-out

channel-speed

This command applies only to T1 devices. Sets the speed of each T1 channel (timeslot) to 56Kbps or 64Kbps. The default is 56K.

Example: set channel-speed

T1 Channel Speed (56/64) [56]? 64

circuit-id

This command applies to T1 and E1 devices. Use the circuit ID to label your T1 or E1 line for SNMP purposes.

Example: set circuit-id

Circuit Id?

crc6

This command applies only to T1 devices. It sets the Cyclic Redundancy Check (CRC) calculation type to ANSI or Japanese.

Example: set crc6

ANSI or JAPanese CRC6?

e1-framing-format

This command applies only to E1 devices. Sets the CRC-Multiframe framing. Set the framing to match your E1 service.

If you set the E1 framing type to structured (G.704), enter the number of timeslots to enable.

The valid range is 1 through 30. Enter 30 to enable all timeslots.

Example: set e1-framing-format

U(NSTRUCTURED), G(704), or T(IMESLOT 16 WITH G.704) [T]? t


U	Unstructured. This is the default setting. (ETSI TBR 012)
G	G.704 (G.704, ETSI TBR 013). If you use this format, you can enable timeslots using the enable timeslots command. You cannot enable timeslot 16 if you use this setting.
T	G.704 with timeslot 16 enabled. If you use this format, timeslot 16 is always enabled, and you can enable other timeslots using the enable timeslots command.

line-build-out

This command applies only to T1 devices. It specifies the line build out for the physical T1 connection. The line build-out parameter allows shaping of the signal waveforms for various cable lengths.

For short-haul (DSX-1) applications, enter the build out in feet, from 0 to 655.

Example: set line-build-out

Short-haul (DSX-1) or long-haul (DS-1/CSU) ? short
Build out (feet) [266]?

For long-haul (DS-1/CSU) applications, enter the build out in decibels. Valid values are 0, 7.5, 15, and 22.5.

Example: set line-build-out

Short-haul (DSX-1) or long-haul (DS-1/CSU) ? long
Build out (-dB) [7.5]? 15

Statistics [M]

Displays statistics for the T1 or E1 module. The counters contain the number of occurrences of various violations and alarms since the last reset or the most recent clearing of the statistics for this interface. (To clear statistics for an interface, enter clear followed by the number of the interface you want to clear at the Monitor> prompt.)

The line state field shows the status of the line synchronization in either direction (No Signal, Unsynchronized, RAI, AIS, Synchronized, Payload Loopback, or RCL).

The following example shows statistics for a T1 module.

Example: statistics

                         T1 Line Statistics

   Line State: No Signal

   Current Interval Time:         16

Line Code Violations:          0     Path Code Violations:         0
Unavailable Seconds:          16     Errored Seconds:              0
Bursty Errored Seconds:        0     Severely Errored Seconds:     0
Severely Errored Framing Sec: 16     Line Errored Seconds:         0
Controlled Slip Seconds:       0

The following example shows statistics for an E1 module.

Example: statistics

                     E1 Module and Link Statistics

Line State:         RCL(Carrier Loss)

                       Current Interval Time:     5

Line Code Violations:         0

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