Fault Isolation; Figure 5-17 Fault Locations; Table 5-3 Fault Conditions - Zhone 100 User Manual

5 Diagnostics

Fault Isolation

F ram e
S w itch
(g)
Fault Loc
Router Failure (a)
Router - FSU Cable (b)
disconnected or router
powered down
CSU (c)
Local Power (d)
T1 Local Loop or DCS (e)
failure
Frame Switch T1 (f)
Access Loop
Frame Switch (g)
High Error Rate (h)
Modem or (i)
Dial Line
5-26
Figure 5-17 shows a typical application with potential fault locations marked
( a ) through ( i ). Table 5-3 describes the corresponding indications, reporting mech-
anisms including the traps for each fault, and suggested test options.
.
(h)
(f)
D C S

Figure 5-17 Fault Locations

Table 5-3 Fault Conditions

Indication(s) Fault Sensing
No LMI from Router. FSU senses lack of LMI, no
DTR, or no power at serial
DTR low at Router.
interface.
No LMI from Router. FSU senses lack of LMI and
no DTR, and no power at
DTR low at Router.
serial interface.
No LMI at Frame FSU self-check.
Switch and NetPath
100.
No LMI at Frame CSU senses AC Power loss.
Switch.
No LMI at Frame CSU senses carrier loss or
Switch. loss of FDL (in non SF
No LMI at NetPath 100. mode).
No LMI at Frame FSU senses no response to
Switch. LMI enquiries.
No LMI at NetPath 100.
No LMI response to FSU senses no LMI response.
CSU.
Trap from Frame FSU monitors Frame Relay
Switch, NetPath 100, or frames.
Router. CSU monitors T1 frames.
Fails periodic Dial Tone Modem can't detect/break
Test. dial tone.
NetPath 100 User's Manual - Installation Guide
D 4
(e)
Trap
Transport
FSU sends inband
Trap.
FSU sends inband
Trap.
FSU sends Trap via
modem.
FSU sends inband
Trap.
FSU sends Traps via
modem.
FSU sends Trap via
modem.
FSU sends Trap via
modem.
FSU sends inband
Trap.
FSU sends inband
Trap.
N etP ath 1 00
S erial
C S U /F S U
(b)
(c)
R ou te r
(a)
C on so le
M od em
(i)
(d)
Test Options
PING Router
Dial into router console port.
PING Router
Dial into router console port.
Call in to Modem.
Frame Switch CSU/Payload
loop tests.
Dial in and check for answer.
Call in to Modem to view T1
status.
Frame Switch CSU/DSU
loop tests.
Check T1 status at Frame
Switch.
FSU to Frame Switch BERT.
Loopback at Frame Switch
toward itself.
BER from FSU, to loop at
Frame Switch.
View 24 hour statistics.
Routine Modem and Dial
Line.
980-001-0210G
June 1999