NEC Univerge sv8500 Manual page 1280

• Check the availability if MG is connected to the following equipment by tandem connection.
CONNECTING EQUIPMENT
MC Note 1
COT Note 2
LDT Note 2
4W ODT
PRI/BRI
EC enabled
TDM64K
EC disabled
EC enabled
TDM32K
EC disabled
TDM Less Than 32K
√
- : Not guaranteed : Available
Tandem here stands for a connection that is established over multiple networks such as shown in the fol-
Note 1:
lowing figure.
Connection between STN A and STN B cannot be guaranteed.
STN A
Tandem Connection Availability
AVAIL-
ABILITY
Not recommended because
−
-Voice quality may be degraded due to multiple conversion.
-Delay may be increased due to excessive jitter buffer insertion.
Voice speech and FAX relay are available. However, DTMF relay is not
−
guaranteed. (Input level can be lower than minimum DTMF detection
level -27.0 dBm because of line loss at public network side.)
Design your private network so that DTMF input level at MG(PRI) may
√
be larger than -27.0 dBm. If not DTMF relay is not guaranteed.
√
√
√
−
√
−
Not recommended because voice quality may be degraded due to data
−
conversion.
ISDN
MG
MG(PRI) (1.5M) [SCA-24PRIA/MG-24PRIA]
DESCRIPTION
IP Network
VOL.2-1027
MC STN B