Hitachi GR2000 Series - Manual (Page 300)

Hitachi Gigabit Router GR2000 Series Enhanced Version Operations - Device Management Overview
8-38 GR2K-GA-0015
Ver. 07-02
8.7.2 Testing on WAN Line
Testing on a WAN line is performed as several kinds of loopback line test and bit
error rate test (BERT). As shown in Figure 8-40, the frame loopback positions differ
depending on the type of testing.
Figure 8-40 Frame Loopback Positions by Test Type for WAN Line
GR2000
Loop Connector
NIF
Modem/DSU
Other End
Device
3 or 5
1. Internal Loopback Test
2. Loop Connector Loopback Test
3. Modem Manual Loopback Test (Note 1)
4. Local Modem Loopback Test (Note 2)
5. Remote Modem Loopback Test (Note 2),
6. Remote Line Loopback Test (Note 3),
7. Nework Line Loopback Test (Note 4),
8. Network Payload Loopback Test (Note 5)
9. BERT (Note 7)
10. Remote Payload Loopback Test(Note 6)
11. Remote Line Inband Loopback Test(Note 6)
Note 1: Modem Manual Loopback test applies only toserial lines ( V.24 /V.35/X.21) connected via a
modem.
Note 2: Local Modem Loopback Test and Remote Modem Loopback Test apply only to V.24 line connected
via a modem.
Note 3: Remote Line Loopback Test applies only to T1 and non-multiplexed T3 lines.
Note 4: Network Line Loopback Test applies only to T1, E1, non-multiplexed T3, non-multiplexed E3,
multiplexed E3, multiplexed T3, OC-3c (8 ports) POS, OC-12c (4 ports) POS and OC-48c POS
lines.
Note 5: Network Payload Loopback Test applies only to T1 and E1 lines.
Note 6: Remote Line Inband Loopback Test and Remote Payload Loopback Test apply only to T1 line.
Note 7: BERT applies only to T1, E1, non-multiplexed T3 and non-multiplexed E3 lines.
1.
2.
3 or 4
6,9,10 or 11
Modem/DSU
7 or 8