Verifying Scramble Configuration - Cisco ASR 1000 Series Software Configuration Manual
Aggregation services routers sip and spa, cisco ios xe everest 16.5
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Also See for ASR 1000 Series:
- Configuration manual (442 pages) ,
- Replacing (120 pages) ,
- Common criteria operational user guidance and preparative procedures (72 pages)
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Configuring the 2-Port and 4-Port Channelized T3 SPAs
T1 1 is down
timeslots: 2-14
FDL per ANSI T1.403 and AT&T 54016 spec.
Configured for FDL remotely line looped (bell)
Transmitter is sending LOF Indication.
Receiver is getting AIS.
Framing is ESF, Clock Source is Line
BERT running on timeslots 2,3,4,5,6,7,8,9,10,11,12,13,14,
BERT test result (running)
Test Pattern : All 1's, Status : Not Sync, Sync Detected : 0
Interval : 2 minute(s), Time Remain : 2 minute(s)
Bit Errors (since BERT started): 0 bits,
Bits Received (since BERT started): 0 Kbits
Bit Errors (since last sync): 0 bits
Bits Received (since last sync): 0 Kbits
Data in current interval (703 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
713 Unavail Secs, 0 Stuffed Secs
357 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
Configuring Scramble
T3 scrambling is used to assist clock recovery on the receiving end. Scrambling is designed to randomize the
pattern of 1s and 0s carried in the physical layer frame. Randomizing the digital bits can prevent continuous,
nonvariable bit patterns—in other words, long strings of all 1s or all 0s. Several physical layer protocols rely
on transitions between 1s and 0s to maintain clocking.
Scrambling can prevent some bit patterns from being mistakenly interpreted as alarms by switches placed
between the Data Service Units (DSUs).
To configure scrambling, use the following commands:
Command
Router# configure terminal
Router(config)# interface serial slot/subslot/port
Router(config-if)# scramble [0 | 1]
Verifying Scramble Configuration
Use the show interface serial command to display the scramble setting:
Router# show interface serial3/0/0
Serial3/0/0 is down, line protocol is down
Hardware is SPA-2XCT3/DS0
MTU 4470 bytes, BW 44210 Kbit, DLY 200 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
OL-14127-17
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS XE
Optional Configurations
Purpose
Enters global configuration mode.
Selects the interface to configure and enters interface
configuration mode.
Enables scrambling. Scrambling is disabled by
default.
• 1—Enabled.
• 0—Disabled.
Everest 16.5
249
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