Toshiba GRL100-701B Instruction Manual page 31

The variation of the channel delay time due to switching the route of the channel is automatically
corrected in the relay and does not influence the synchronized sampling provided the sending
and receiving channels take the same route. If the routes are separate, the transmission delay
difference time must be set (see Section 2.2.7).
When the route is switched in A- or B-mode application, the synchronized sampling recovers
within 4s in case of a two- terminal line and 6s in case of a three-terminal line after the switching.
The differential element is blocked until the sampling synchronization is established.
In GPS-mode application (GPS-based synchronization), the sampling synchronization is not
influenced by the route switch. The differential element is only blocked for the duration of the
path switching.
2.2.13.2 Linking to Communication Circuit
The GRL100 can be provided with one of the following interfaces by order type and linked to a
dedicated optical fiber communication circuit or multiplexed communication circuit.
• Optical interface (1310nm, SM, 30km class)
• Optical interface (1550nm, DSF(Dispersion Shifted Fibre), 80km class) (*)
• Optical interface (820nm, GI, 2km class)
• Electrical interface in accordance with CCITT-G703-1.2.1
• Electrical interface in accordance with CCITT-G703-1.2.2 and 1.2.3
• Electrical interface in accordance with CCITT X.21
• Electrical interface in accordance with RS422, RS530
Note (*): When using the 80km class optical interface, it is necessary to ensure that the received
optical power does not exceed −10dB, in order to avoid communication failure due to
overloading of the receiver.
When testing in loop-back mode, for instance, the sending terminal should be
connected to the receiving terminal via an optical attenuator with 10 dB or more
attention.
Even if the sending terminal is directly connected to the receiving terminal, the optical
transceiver will not damaged, but communication failures may occur.
- Fibre Coupled Power: −5 to 0dBm
- Input Power Range: −34 to −10dBm
- Optical Damage Input Level: 3dBm
Alternative links to the telecommunication circuit are shown in Figure 2.2.13.2 (a) to (c).
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6 F 2 S 0 8 5 0