First of all the question itself is ambiguous as clocking occurs at the
physical layer of the OSI model. The DCE side is the PSTN and the DTE side is
the user side and both reside at layer 1.
The question really doesn't make sense.
!
Question:
> Take clocking for Layer 1 from Network side.
> Your PRI clocking of layer 2 should be user side. <No clocking at layer 2>
!
In answer you your query about verification use the "show controller t1 0/0/0"
to determine if the circuit is running clean. Another useful command is "show
interface serial 0/0/0:23".
!
With show controller your verifying, framing, line coding, clocking and you're
looking for errors such as:
!
Data in current interval (90 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
!
The show interface command will show you MTU, Bandwidth, Delay, Reliability,
and transmit and receive load as well as possible errors:
!
R1#show interface serial 0/0/0:23
Serial0/0/0:23 is up, line protocol is up (spoofing)
Hardware is DSX1
MTU 1500 bytes, BW 64 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Last input 00:00:13, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 48 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
613735 packets input, 2458376 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
613719 packets output, 2456979 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions
Timeslot(s) Used:24, SCC: 0, Transmitter delay is 0 flags
!
!
Michael Sears, CCIE(V)#38404
"Designing and Implementing Cisco Unified Communications on Unified Computing
Systems"
From: Karen Johnson [mailto:karen.johnson...@yahoo.ca]
Sent: Tuesday, July 02, 2013 11:12 PM
To: Sears, Michael (msears); ccie_voice@onlinestudylist.com
Subject: Re: How to configure Clocking for GW's
tks Mike, very comprehensive
- what is the verification command ? do we need to " sh controller t1 " to see
if any noise on PRI line ?
________________________________
From: "michael.se...@compucom.com<mailto:michael.se...@compucom.com>"
<michael.se...@compucom.com<mailto:michael.se...@compucom.com>>
To: ccie_voice@onlinestudylist.com<mailto:ccie_voice@onlinestudylist.com>
Cc: karen.johnson...@yahoo.ca<mailto:karen.johnson...@yahoo.ca>
Sent: Monday, July 1, 2013 9:09:31 AM
Subject: RE: How to configure Clocking for GW's
How to set clocking for PSTN Router and Branch Routers Example using MGCP
gateway:
!
!
Question:
> Take clocking for Layer 1 from Network side. -->Means PSTN is Network Side
> Your PRI clocking of layer 2 should be user side. -->Means Branch takes
> clock from PSTN
!
!
PSTN ROUTER
network-clock-participate wic 1
controller T1 0/1/0
clock source internal
linecode B8ZS
framing ESF
pri-group timeslots 1-24
clock source internal <Makes PSTN the Network Side>
description ** T1 PRI Voice Connection To: S0/1/0 BR1-RTR **
!
!
interface Serial0/1/0:23
description ** T1 VOICE CONNECTION TO S0/1/0 BR1-RTR **
no ip address
encapsulation hdlc
isdn switch-type primary-ni
isdn protocol-emulate network <Makes PSTN the Network Side>
isdn incoming-voice voice
isdn negotiate-bchan resend-setup
isdn outgoing display-ie
isdn outgoing ie redirecting-number
no cdp enable
!
!
PSTN#show controller t1 0/1/0
T1 0/1/0 is up.
Framing is ESF, Line Code is B8ZS, Clock Source is Internal.
!
!
BRANCH ROUTERS USING T1 MGCP
isdn switch-type primary-ni
network-clock-participate wic 0
network-clock-select 1 T1 0/1/0
controller T1 0/0/0
pri-group timeslots 1-24 service mgcp
clock source line <Makes Router the user Side gets clock from PSTN>
linecode B8ZS
framing ESF
description ==VOICE PRI==
!
!
interface Serial0/1/0:23
no ip address
encapsulation hdlc
isdn switch-type primary-ni
isdn incoming-voice voice
isdn bind-l3 ccm-manager
isdn send-alerting
isdn sending-complete
isdn outgoing display-ie
isdn outgoing ie redirecting-number
no cdp enable
!
!
BR1-RTR#show controller t1 0/1/0
T1 0/1/0 is up.
Framing is ESF, Line Code is B8ZS, Clock Source is Line.
!
!
!Hope this helps clarify the clocking issues and configuration.
!
!
Michael Sears, CCIE(V)#38404
"Designing and Implementing Cisco Unified Communications on Unified Computing
Systems"
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