Verifying D Channel Configuration

Step 6 Return to privileged EXEC mode:

Gateway(config-if)# ctrl-z

Gateway#

Tip To save the gateway configuration, save it to NVRAM. See the “Saving Configuration Changes” section on page 60.

To verify your D channel configuration, enter the show interface serial command and make sure that the line protocol is up and that you are using the correct IP interface. Also, make sure that excessive errors are not being reported.

Gateway# show interface serial 1/0:23

Serial1/0:23 is up, line protocol is up (spoofing) Hardware is DSX1

Internet address is 172.16.254.254/16

MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255

Encapsulation PPP, loopback not set

Last input 00:00:03, output never, output hang never Last clearing of "show interface" counters 00:00:01 Queueing strategy:fifo

Output queue 0/40, 0 drops; input queue 0/75, 0 drops 1 minute input rate 0 bits/sec, 0 packets/sec

1 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

Timeslot(s) Used:24, Transmitter delay is 0 flags

Configuring the Universal Port or Dial-Only Feature Cards

The universal port or dial-only feature cards support all modem standards and features. In contrast to the more traditional line-to-modem mapping, lines are mapped to a system processing engine (SPE) that resides on the universal port and dial-only feature card. Associated SPE firmware serves a function similar to that of modem code on a modem ISDN channel aggregation (MICA) technologies modem.

One SPE provides services for six ports, with additional ports per SPE. Busyout and shutdown can be configured at the SPE or port level.

The universal port and dial-only feature card performs the following functions:

•Converts pulse code modulation (PCM) bitstreams to digital packet data

•Forwards converted and packetized data to the main processor, which examines the data and forwards it to the backhaul egress interface

•Supports all modem standards (such as V.34 and V.42bis) and features, including dial-in and dial-out