| SINGLE ISDN PRI |
Multiple ISDN BRI |
|
Carrier
must take entire circuit down to test. Complete loss of service. |
Only
affected redundant spans require testing. You just loose 2 channels
during test. |
|
Many times
uses mid span repeaters, R-cards and C-cards. Many points of failure. |
Straight
copper technology. Fewer points of failure. |
|
Found
errors has no baseline. No comparative testing. |
Each
circuit can be evaluated against other circuits for quality. Comparison
is the easiest method for testing. "Make circuit 4 work like circuit 3." |
|
Verizon
must install, maintain and repair "smart jack" electronics. CLEC can't
touch what may be obviously broken. |
NO
smart jacks electronics used ! It's straight copper. Simple is better. |