Configuring T1 or E1 Interfaces

This chapter provides the information about how to configure a T1 or E1 interface.

Setting the Card Type

To set the card type for the T1/E1 interfaces, complete these steps: 

 
enable
configure terminal
card type t1  0 1
exit

Configuring the Controller

To configure T1 interface, use the following commands: 

 
enable
configure terminal
controller t1 0/1/0
clock source internal
framing esf
cablelength short 110
linecode b8zs
no shut
exit

Note

For T1 interface, the default frame mode is Extended Super Frame (ESF).

To configure E1 interface, use the following commands: 

 
enable
configure terminal
controller e1 0/1/0
clock source internal
framing crc4
linecode hdb3
no shut
exit

Note

For E1 interface, the default frame mode is Cyclic Redundancy Check 4 (CRC4).

Staring with Cisco IOS XE Cupertino 17.7.1, the cable length short values are modified for the following interface modules:

  • ASR-920-12SZ-IM

Table 1. Cable Length Short Values

Cable Length Short (in ft)

 Range (in ft)

110

0–133

220

134–266

330

267–399

440

400-533

550

534–655
Table 2. Cable Length Short Values - IMs

Cable Length Short (in ft)

 Range (in ft)

110

0–110

220

111–220

330

221–330

440

331–440

550

441–550

Verifying the Controller Configuration

Use the show controllers command to verify the controller configuration:

Use the show platform command to verify the router information: 


Router#show platform
Chassis type: ASR-920-12SZ-IM

Slot Type State Insert time (ago)
--------- ------------------- --------------------- -----------------
0/0 12xGE-4x10GE-FIXED ok 01:49:48
0/1 NCS4200-48T1E1-CE ok 01:49:48
R0 ASR-920-12SZ-IM ok, active 01:56:45
F0 ok, active 01:56:45
P0 ASR920-PSU0 ok 01:54:45
P1 ASR920-PSU1 N/A never
P2 ASR920-FAN ok 01:54:44

Slot CPLD Version Firmware Version
--------- ------------------- ---------------------------------------
R0 2008241E 15.6(46r)S
F0 2008241E 15.6(46r)S

Configuring Structure-Agnostic TDM over Packet - T1/E1 Interfaces

To configure Structure-Agnostic TDM over Packet (SAToP), use the following commands:
 
enable 
configure terminal
controller t10/1/0
cem-group 0 unframed 
exit

Note

To configure SAToP, the framing mode for the port is set to unframed.

Verifying CEM Configuration for SAToP

Use the following command to verify the CEM configuration for T1/E1 interfaces: 

Router#  show cem circuit interface CEM 0/1/0

CEM0/1/0, ID: 0, Line: UP, Admin: UP, Ckt: ACTIVE
Controller state: up, T1 state: up
Idle Pattern: 0xFF, Idle CAS: 0x8
Dejitter: 5 (In use: 0)
Payload Size: 192
Framing: Unframed
CEM Defects Set
None

Signalling: No CAS
RTP: No RTP

Ingress Pkts:    475471               Dropped:             0
Egress Pkts:     475471               Dropped:             0

CEM Counter Details
Input Errors:    0                    Output Errors:       0
Pkts Missing:    0                    Pkts Reordered:      0
Misorder Drops:  0                    JitterBuf Underrun:  0
Error Sec:       0                    Severly Errored Sec: 0
Unavailable Sec: 0                    Failure Counts:      0
Pkts Malformed:  0                    JitterBuf Overrun:   0

Configuring Framed SAToP


Note

Framing type should be maintained same in all routers end to end.

To configure framed SAToP:

enable
configure terminal
controller t1 0/1/0
framing esf
cem-group 0 framed
exit

Verifying Framed SAToP Configuration

Use the following command to verify the CEM configuration for T1/E1 interfaces: 

Router#  show cem circuit interface cem 0/1/0

CEM0/1/0, ID: 0, Line: UP, Admin: UP, Ckt: ACTIVE
Mode :T1, CEM Mode: T1-SAToP
Controller state: up, T1 state: up
Idle Pattern: 0xFF, Idle CAS: 0x8
Dejitter: 5 (In use: 0)
Payload Size: 192
Framing: Framed SAToP
CEM Defects Set
None

Signalling: No CAS
RTP: No RTP

Ingress Pkts: 7836 Dropped: 0
Egress Pkts: 7836 Dropped: 0

CEM Counter Details
Input Errors: 0 Output Errors: 0
Pkts Missing: 0 Pkts Reordered: 0
Misorder Drops: 0 JitterBuf Underrun: 0
Error Sec: 0 Severly Errored Sec: 0
Unavailable Sec: 0 Failure Counts: 0
Pkts Malformed: 0 JitterBuf Overrun: 0
Generated Lbits: 0 Received Lbits: 0
Generated Rbits: 0 Received Rbits: 0

Verifying CEM Statistics for Framed SAToP

Use the following commands to verify the pseudowire configuration for SAToP:

  • show cem circuit —Displays information about the circuit state, administrative state, the CEM ID of the circuit, and the interface on which it is configured. If cross connect is configured under the circuit, the command output also includes information about the attachment circuit status. 

Router# show cem circuit
  
  <0-4294967295>    CEM ID
  detail     Detailed information of cem ckt(s)
  interface  CEM Interface
  summary    Display summary of CEM ckts
  |          Output modifiers
Router# show cem circuit
 
CEM Int. ID Ctrlr Admin Circuit AC
--------------------------------------------------------------
CEM0/1/0 1   UP    UP    Active UP
CEM0/1/1 2   UP    UP    Active UP
CEM0/1/2 3   UP    UP    Active UP
CEM0/1/3 4   UP    UP    Active UP
CEM0/1/4 5   UP    UP    Active UP
  • show cem circuit cem-id — Displays the detailed information about that particular circuit. 

Router# show cem circuit 0
CEM0/1/2, ID: 0, Line: UP, Admin: UP, Ckt: ACTIVE
Mode :T1, CEM Mode: T1-SAToP
Controller state: up, T1 state: up
Idle Pattern: 0xFF, Idle CAS: 0x8
Dejitter: 5 (In use: 0)
Payload Size: 192
Framing: Framed SAToP
CEM Defects Set
None

Signalling: No CAS
RTP: No RTP

Ingress Pkts: 167027103 Dropped: 0
Egress Pkts: 167027102 Dropped: 0

CEM Counter Details
Input Errors: 0 Output Errors: 0
Pkts Missing: 0 Pkts Reordered: 0
Misorder Drops: 0 JitterBuf Underrun: 0
Error Sec: 0 Severly Errored Sec: 0
Unavailable Sec: 0 Failure Counts: 0
Pkts Malformed: 0 JitterBuf Overrun: 0
Generated Lbits: 0 Received Lbits: 0
Generated Rbits: 0 Received Rbits: 0
  • show cem circuit summary — Displays the number of circuits which are up or down per interface basis. 

Router# show cem circuit summary
 
CEM Int. Total Active Inactive
--------------------------------------
CEM0/1/0   1     1      0
CEM0/1/1   1     1      0
CEM0/1/2   1     1      0
CEM0/1/3   1     1      0
CEM0/1/4   1     1      0

Verifying CEM Statistics for SAToP

Use the following commands to verify the pseudowire configuration for SAToP:

  • show cem circuit —Displays information about the circuit state, administrative state, the CEM ID of the circuit, and the interface on which it is configured. If cross connect is configured under the circuit, the command output also includes information about the attachment circuit status. 

Router# show cem circuit
  
  <0-32000>    CEM ID
  detail     Detailed information of cem ckt(s)
  interface  CEM Interface
  summary    Display summary of CEM ckts
  |          Output modifiers
Router# show cem circuit
 
CEM Int.       ID   Line      Admin     Circuit         AC  
-------------------------------------------------------------- 
CEM0/1/0       1    UP        UP        ACTIVE          --/--
CEM0/1/0       2    UP        UP        ACTIVE          --/--
CEM0/1/0       3    UP        UP        ACTIVE          --/--
CEM0/1/0       4    UP        UP        ACTIVE          --/--
CEM0/1/0       5    UP        UP        ACTIVE          --/--
  • show cem circuit cem-id — Displays the detailed information about that particular circuit. 

Router# show cem circuit 0

CEM0/1/2, ID: 0, Line: UP, Admin: UP, Ckt: ACTIVE
Controller state: up, T1 state: up
Idle Pattern: 0xFF, Idle CAS: 0x8
Dejitter: 5 (In use: 0)
Payload Size: 192
Framing: Unframed
CEM Defects Set
None

Signalling: No CAS
RTP: No RTP

Ingress Pkts:    11060                Dropped:             0
Egress Pkts:     11061                Dropped:             0

CEM Counter Details
Input Errors:    0                    Output Errors:       0
Pkts Missing:    0                    Pkts Reordered:      0
Misorder Drops:  0                    JitterBuf Underrun:  0
Error Sec:       0                    Severly Errored Sec: 0
Unavailable Sec: 0                    Failure Counts:      0
Pkts Malformed:  0                    JitterBuf Overrun:   0
  • show cem circuit summary — Displays the number of circuits which are up or down per interface basis. 

Router# show cem circuit summary
 
CEM Int.       Total Active  Inactive
--------------------------------------
CEM0/1/0       1     1       0

Configuring CEM Group for SAToP for T1 Interfaces

To configure a CEM group for SAToP. 

enable
configure terminal
controller t1 0/1/0
cem-group 0 unframed
end

Note

You need metroaggrservice license to configure CEM group on the Interface Module.

Configuring CEM Group for CESoPSN on T1 Interface

The following section describes how to configure a CEM group for CESoPSN.

To configure xconnect over MPLS, use the following commands:

enable
configure terminal
controller t1 0/1/32
cem-group 0  timeslots 1-10
Configure cross-connect:

enable
configure terminal
interface cem 0/1/32
cem 0
xconnect 10.2.2.2 10 encapsulation mpls

Perform a similar configuration on the other end of the pseudowire.


show running-config | sec 0/1/16
controller t1 0/1/16
 framing esf
 linecode b8zs
 cablelength short 110
  cem-group 0 timeslots 1-10
interface CEM0/1/16
 no ip address
 cem 0
  xconnect 10.2.2.2 10 encapsulation mpls

Check for cross-connect configuration using the following command:



Router#show xconnect all  | i 0/1/32
UP pri   ac CE0/1/32:0(CESoPSN Basic)    UP mpls 10.2.2.2:10       UP

Router#sh controllers  t1 0/1/32
T1 0/1/32 is up
  Applique type is NCS4200-48T1E1-CE
  Cablelength is short 110
  No alarms detected.
  alarm-trigger is not set
  Soaking time: 3, Clearance time: 10
  AIS State:Clear  LOS State:Clear  LOF State:Clear 
  Framing is ESF, Line Code is B8ZS, Clock Source is Line.

Verifying CEM for CESoPSN on T1 Interface

Use the following commands to verify the pseudowire configuration for CESoPSN:

  • show cem circuit—Displays information about the circuit state, administrative state, the CEM ID of the circuit, and the interface on which it is configured. If cross connect is configured under the circuit, the command output also includes information about the attachment circuit status.

  • show mpls l2 vc—Displays information about the MPLS VC.

  • show mpls l2 vc detail—Displays detailed information about the MPLS VC.


PE1#show mpls l2 vc 10

Local intf     Local circuit              Dest address    VC ID      Status
-------------  -------------------------- --------------- ---------- ----------
CE0/1/32       CESoPSN Basic 0            10.2.2.2         10         UP        

PE1#sh mpls l2 vc 10 detail 
Local interface: CE0/1/32 up, line protocol up, CESoPSN Basic 0 up
  Destination address: 10.2.2.2, VC ID: 10, VC status: up
    Output interface: Te0/0/0, imposed label stack {650}
    Preferred path: not configured  
    Default path: active
    Next hop: 209.165.202.129
  Create time: 00:21:25, last status change time: 00:21:25
    Last label FSM state change time: 00:21:25
  Signaling protocol: LDP, peer 10.2.2.2:0 up
    Targeted Hello: 10.1.1.1(LDP Id) -> 10.2.2.2, LDP is UP
    Graceful restart: configured and not enabled
    Non stop routing: not configured and not enabled
    Status TLV support (local/remote)   : enabled/supported
      LDP route watch                   : enabled
      Label/status state machine        : established, LruRru
      Last local dataplane   status rcvd: No fault
      Last BFD dataplane     status rcvd: Not sent
      Last BFD peer monitor  status rcvd: No fault
      Last local AC  circuit status rcvd: No fault
      Last local AC  circuit status sent: No fault
      Last local PW i/f circ status rcvd: No fault
      Last local LDP TLV     status sent: No fault
      Last remote LDP TLV    status rcvd: No fault
      Last remote LDP ADJ    status rcvd: No fault
    MPLS VC labels: local 577, remote 650 
    Group ID: local 238, remote 276
    MTU: local 0, remote 0
    Remote interface description: 
  Sequencing: receive disabled, send disabled
  Control Word: On (configured: autosense)
  SSO Descriptor: 10.2.2.2/10, local label: 577
  Dataplane:
    SSM segment/switch IDs: 6893171/4140658 (used), PWID: 674
  VC statistics:
    transit packet totals: receive 0, send 0
    transit byte totals:   receive 0, send 0
    transit packet drops:  receive 0, seq error 0, send 0

Configuring DS1 Local Connet

The following section describes how to configure first segment for DS1 local connection:

enable
configure terminal
controller T1 0/1/0
framing unframed
clock source internal
linecode b8zs
cablelength short 110
cem-group 0 unframed
description TO_CE1_0/1/0
The following section describes how to configure second segment for DS1 local connection:

enable
configure terminal
controller T1 0/1/3
framing unframed
clock source recovered 0
linecode b8zs
cablelength short 110
cem-group 0 unframed
description TO_CE1_0/1/1

The following section describes how to create a DS1 local connection:


enable
configure terminal
connect ds1_connect CEM0/1/0 0 CEM0/1/3 0

Verifying DS1 Local Connect

Use the following commands to verify the DS1 local connection:

  • show connection name—Displays information about the connection state and segment state.


Router#show connection name ds1_connect

Connection: 673 – ds1_connect
 Current State: UP
 Segment 1: CEM0/1/0 SATOP T1 0 up
 Segment 2: CEM0/1/3 SATOP T1 0 up