Toshiba GRL100-701B Instruction Manual page 40

'GPS-MODE'. The 'GPS-MODE' is only available for the relay provided with a
GPS interface.
PDTD, GPSBAK, AUTO2B, SRCθ : Available for [COMMODE]='GPS-MODE' setting. See
Note: Do not set [TERM] to "Dual" in GPS-mode.
Setting of TDSV, TCDT1 and TCDT2
The TDSV is a transmission delay time threshold setting. GRL100 gives an alarm if the
transmission delay time exceeds TDSV. The alarm messages are 'Td1 over' for CH1 and 'Td2
over' for CH2.
The TCDT1 and TCDT2 are transmission time delay difference settings for CH1 and CH2
respectively. If there is a permanent and constant difference of more than 100µs between the
send and receive channel delay times, then the TCDT setting is used to compensate for that
difference. The setting is calculated as follows:
TCDT = (Sending delay time) − (Receiving delay time)
(Example)
CH1: TCDT1 = 5000 − 3000
µ s
= 2000
CH2: TCDT2 = 1000 − 2000
µ s
= −1000
Setting of [SP.SYN]
One of terminals must be set to MASTER and others SLAVE.
If not, the synchronized sampling fails under the intra-system synchronized sampling or backup
modes of the GPS-based synchronized sampling.
Note: As the simultaneous setting change at all terminals is not practical, it is not recommended to
change the settings when the relay is in service.
Setting of [CH.CON]
In case of the two-terminal line application, the communication ports of the GRL100 are
interlinked with port CH1 as shown in Figure 2.2.14.3(a) and (b). In case of three-terminal
application, port CH1 of one terminal and port CH2 of the other terminal are linked as shown in
Figure 2.2.14.3(c).
In these normal linkages, the communication port exchange switch [CH.CON] is set to
"Normal".
Setting of [T.SFT1], [T.SFT2], [B.SYN1], and [B.SYN2]
T.SFT1: is used to synchronise the relay with multiplexer by shifting the send signal by a half-bit
when the distance from the relay to the multiplexer is long. When electrical interface
X.21, CCITT G.703-1.2.2 or -1.2.3 is applied and the distance (cable length from relay to
multiplexer) is 300m or more, the setting is set to 'ON'. (for channel 1)
T.SFT2: same as above. (for channel 2)
Section 2.2.7.
CH2 CH1
5000µs RELAY A
3000µs
1000µs
CH1 1000µs
CH2
RELAY C 2000µs
 39 
CH1: TCDT1 = 1000 − 1000
µ s
= 0
CH2: TCDT2 = 3000 − 5000
µ s
= −2000
1000µs
CH1: TCDT1 = 2000 − 1000
CH2
CH1
CH2: TCDT2 = 1000 − 1000
RELAY B
6 F 2 S 0 8 5 0
µ s
= 1000
µ s
= 0