Configuring Channelized Interfaces

Channelized interfaces enable you to configure a number of individual channels that subdivide the bandwidth of a larger interface and minimize the number of PICs that an installation requires.

Configuring Channelized DS-3 to DS-0 Interfaces

To configure Channelized DS-3 to DS-0 interface properties, include the t3-options , t1-options , or ds0-options statement. To specify options for the T3 side of the connection, include the t3-options statement. These statements are supported only for channel 0; they are ignored if configured on other channels.

 [edit interfaces  interface-name  ]  t3-options {   bert-algorithm  algorithm  ;   bert-error-rate  rate  ;   bert-period  seconds  ;   (cbit-parity  no-cbit-parity);   (feac-loop-respond  no-feac-loop-respond);   loopback (local  remote); } 

To specify options for each of the T1 channels, include the t1-options statement:

 [edit interfaces  interface-name  ]  t1-options {   byte-encoding (nx64  nx56);   fcs (32  16);   framing (sf  esf);   idle-cycle-flag (flags  ones) ;   invert-data;   loopback (local  remote);   start-end-flag (shared  filler) ;   timeslots  time-slot-number  ; } 

To specify options for each of the DS-0 channels, include the ds0-options statement:

 [edit interfaces  interface-name  ]  ds0-options {   byte-encoding (nx64  nx56);   fcs (32  16);   idle-cycle-flag (flags  ones) ;   invert-data;   start-end-flag (shared  filler) ; } 

You can configure 28 T1 channels per T3 interface. Each T1 link can have up to eight DS-0 channel groups, and each channel group can hold any combination of DS-0 time slots. To specify the T1 link and DS-0 channel group number in the interface name, use colons (:) as separators. The software uses the following rules to apply the interface options:

• To configure the T3 options, set the T1 link to 0 and channel group to 0:

   ds-0/0/0:0:0. 

• To configure the t1-options , set channel group to 0; the T1 link can be any value :

   ds-0/0/0:  x:  

• There are no restrictions on configuring the DS-0 options.

• If you delete a configuration you previously committed for channel group 0, the options return to default values.

To configure the channel groups and time slots for a Channelized DS-3 to DS-0 interface, include the channel-group and timeslots statements. If you commit the interface name but do not include the [edit chassis] configuration, the Channelized DS-3 to DS-0 PIC behaves like a Channelized DS-3 to DS-1 PIC: none of the DS-0 functionality is accessible. Table 6.9 shows the ranges for each of the quantities in the following configuration:

 [edit chassis fpc  slot-number  pic  pic-number  ct3 port  port-   number  t1  link-number  ] channel-group  group-number  timeslots  time-slot-number  ; 

Table 6.9. Ranges for Channelized DS-3 to DS-0 Configuration

Item	Option	Range
FPC slot	slot-number	0 through 7
PIC slot	pic-number	0 through 3
Port	port-number	0 through 1
T1 link	link-number	0 through 27
DS-0 channel group	group-number	0 through 7
Time slot	time-slot-number	1 through 24

Bandwidth limitations restrict the interface to a maximum of 128 channel groups per T3 port, rather than the theoretical maximum of 224 (8 times 28).

There are 24 time slots on a T1 interface. You can designate any combination of time slots for use, but you can use each time slot number on only one channel group within the same T1 link.

Configuring Channelized DS-3 to DS-1 Interfaces

To configure Channelized DS-3 to DS-1 interface properties, include both the t1-options and t3-options statements. To specify options for the T3 side of the connection, include the t3-options statement. These statements are supported only for channel 0; they are ignored if configured on other channels.

For information about configuring these statements, see "Configuring T1 and T3 Interfaces," on page 256.

 [edit interfaces  interface-name  ]  t3-options {   bert-algorithm  algorithm  ;   bert-error-rate  rate  ;   bert-period  seconds  ;   (cbit-parity  no-cbit-parity);   (feac-loop-respond  no-feac-loop-respond);   loopback (local  remote); } 

To specify options for each of the T1 channels, include the t1-options statement:

 [edit interfaces  interface-name  ]  t1-options {   byte-encoding (nx64  nx56);   fcs (32  16);   framing (sf  esf);   idle-cycle-flag (flags  ones) ;   loopback (local  remote);   start-end-flag (shared  filler) ;   timeslots  time-slot-number  ; } 

You can configure 28 T1 channels per T3 interface, and each interface can have logical interfaces. To specify the channel number, include it after the colon ( : ) in the interface name.

Configuring Channelized E1 Interfaces

For information about configuring these statements, see "Configuring E1 and E3 Interfaces," on page 214.

To configure Channelized E1 interface properties, include the e1-options statement:

 [edit interfaces  interface-name  ]  e1-options {   fcs (32  16);   framing (g704  g704-no-crc4  unframed);   idle-cycle-flag (flags  ones) ;   loopback (local  remote);   start-end-flag (shared  filler) ; } 

To specify options for each of the DS-0 channels, include the ds0-options statement:

 [edit interfaces  interface-name  ]  ds0-options {   byte-encoding (nx64  nx56);   fcs (32  16);   idle-cycle-flag (flags  ones) ;   loopback (local  remote);   start-end-flag (shared  filler) ; } 

Each Channelized E1 PIC has 10 E1 ports that you can channelize to the N x DS-0 level. Each E1 interface has 32 time slots (DS-0), in which time slot 0 is reserved. You can combine one or more of these DS-0 time slots (channels) to create a channel group ( N x DS-0). There can be a maximum of 24 channel groups per E1 interface. Thus, you can configure a maximum of 240 channel groups per PIC (10 ports times 24 channel groups per port).

To specify the DS-0 channel group number in the interface name, include a colon (:) as a separator. The software applies the interface options you configure according to the following rules:

• To configure the E1 options, you must set channel group x to 0; that is, ds-0/0/0:0 .

• There are no restrictions on configuring the DS-0 options.

• If you delete a configuration you previously committed for channel group 0, the options return to default values.

To configure the channel groups and time slots for a Channelized E1 interface, include the channel-group and timeslots statements. If you commit the interface name but do not include the [edit chassis] configuration, the Channelized E1 PIC behaves like a standard E1 PIC: none of the DS-0 functionality is accessible. Table 6.10 shows the ranges for each of the quantities in the following configuration:

 [edit chassis]  fpc  slot-number  {   pic  pic-number  {     ce1 {       e1  link-number  {         channel-group  group-number  timeslots  time-slot-number  ;       }     }   } } 

The theoretical maximum number of channel groups possible per PIC is 240 (10 times 24). This is within the maximum bandwidth available.

Table 6.10. Ranges for Channelized E1 Configuration

Item	Option	Range
FPC slot	slot-number	0 through 7
PIC slot	pic-number	0 through 3
E1 link	link-number	0 through 9
DS-0 channel group	group-number	0 through 23
Time slot	time-slot-number	0 through 31 (with time slot 0 reserved)

There are 32 time slots on an E1 interface. You can configure any combination of time slots. However, time slot 0 is reserved. For channelized fractional E1 interfaces only, when you include the time slots statement at the [edit interfaces interface-name e1-options] hierarchy level, time slot 1 is reserved, so you must allocate time slots in the range of 2 through 32. Alternatively, you can configure time slots by including the channel-group and timeslots statements at the [edit chassis] hierarchy level, in which case you can allocate time slots in the range of 1 through 31.

Configuring Channelized OC-12 Interfaces

To configure Channelized OC-12 interface properties, include the sonet-options and t3-options statements. For more information, see "Configuring SONET/SDH Interfaces," on page 240 and "Configuring T1 and T3 Interfaces," on page 256.

Configuring Channelized OC-3 and STM-1 Interfaces

There are two types of channelized optical PICs: Channelized OC-3 to T1 and Channelized STM-1 to E1. To configure the interface properties for these PICs, include the e1-options or t1-options statement and the sonet-options statement for both sides of the connection.

For information about configuring these statements, see "Configuring E1 and E3 Interfaces," on page 214.

To specify options for each of the E1 channels on the Channelized STM-1 to E1 PIC, include the e1-options statement:

 [edit interfaces  interface-name  ]  e1-options {   bert-error-rate;   bert-period;   fcs (32  16);   framing (g704  g704-no-crc4  unframed);   idle-cycle-flag (flags  ones) ;   loopback (local  remote);   start-end-flag (shared  filler) ;   timeslots  time-slot-number  ; } 

For information about configuring these statements, see "Configuring SONET/SDH Interfaces," on page 240.

To specify options for the SONET/SDH side of the connection, include the sonet-options statement:

 [edit interfaces  interface-name  ]  sonet-options {   bytes {     e1-quiet  value  ;     f1  value  ;     f2  value  ;     s1  value  ;     z3  value  ;     z4  value  ;   }   loopback (local  remote); } 

For information about configuring these statements, see "Configuring T1 and T3 Interfaces," on page 256.

To specify options for each of the T1 channels on the Channelized OC-3 to T1 PIC, include the t1-options statement:

 [edit interfaces  interface-name  ]  t1-options {   byte-encoding (nx64  nx56);   fcs (32  16);   framing (sf  esf);   idle-cycle-flag (flags  ones) ;   loopback (local  remote);   start-end-flag (shared  filler) ;   timeslots  time-slot-number  ; } 

You can configure up to 63 E1 channels per single-port Channelized STM-1 to E1 PIC. To specify the channel number, include it after the colon ( : ) in the interface name. You can configure up to 84 T1 channels per single-port Channelized OC-3 to T1 PIC. To specify the channel number, include it after the colon ( : ) in the interface name.

By default, virtual tributary mapping uses KLM mode. To configure virtual tributary mapping to use ITU-T mode, include the vtmapping statement, specifying the itu-t option:

 [edit chassis fpc  slot-number  pic  pic-number  ]  vtmapping itu-t;